Ford Bronco EEC IV Codes (from zen bronco).

NOTE: When you see "is/was" listed for a code:

For a HARD fault code the sensor IS out of range right now.

For a MEMORY code, it WAS out of range at one time (possible intermittent wire etc.).

Some codes pertain to more than one system but there will be only one of the systems on the vehicle.

For example code 58. A vehicle with a VAT sensor will not have an Idle Tracking Switch.

Differences in test mode noted as:

(O) = Key On Engine Off test

(R) = Key On Engine Running test

(M) = Memory code

10	11	12	13	14	15	16	17	18	19
	21	22	23	24	25	26	27	28	29
	31	32	33	34	35	36		38	39
40	41	42	43	44	45	46	47	48	49
	51	52	53	54	55	56	57	58	59
	61	62	63	64	65	66	67	68	69
70	71	72	73	74	75	76	77	78	79
80	81	82	83	84	85	86	87	88	89
90	91	92	93	94	95	96	97	98	99

NOTE: When you see "is/was" listed for a code:
For a HARD fault code the sensor IS out of range right now.
For a MEMORY code, it WAS out of range at one time (possible intermittent wire etc.).

Some codes pertain to more than one system but there will be only one of the systems on the vehicle.
For example code 58. A vehicle with a VAT sensor will not have an Idle Tracking Switch.

Differences in test mode noted as:
(KOEO) = Key On Engine Off test
(KOER) = Key On Engine Running test
(Mem) = Memory code

Code	MODE	most likely source	[return]
10		Separator Code	[return]
11		System checks OK.	[return]
12		Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too low)	[return]
13	(KOEO)	ISC did not respond properly (extends to touch throttle then retracts for KOEO)	[return]
13	(KOER)	Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too high)	[return]
13	(Mem)	ISC sticking, open ITS circuit or TP sticking	[return]
14		Ignition pickup was erratic E4OD Transmission diesel RPM sensor. Diesel RPM sensor	[return]
15	(KOEO)	No Keep Alive Memory power to PCM pin 1 or bad PCM (Memory Test Failure)	[return]
15	(Mem)	KAM (pin 1) was interrupted (was battery disconnected ?)	[return]
16		1.9L & 2.5L. Throttle stop set too high. IDLE or Idle Set Procedures 2.3L. RPM's too low.	[return]
16	(KOEO)	Electronic ignition. IDM circuit fault. Ignition Systems	[return]
17		1.9L & 2.5L. Throttle stop set too low.	[return]
18	(KOER)	Check base timing & advance function. (Mem) Ignition TACH signal erratic.	[return]
19	(KOEO)	No Vehicle Power (pins 37 + 57) or bad PCM VPWR Diagnosis	[return]
19	(KOER)	Erratic idle during test (reset throttle & retest). Electronic ignition Cylinder ID sensor/circuit problem.	[return]
21		Engine Coolant Temperature (ECT) sensor out of range.	[return]
22		MAP (vacuum) or BARO signal out of range.	[return]
23		Throttle sensor out of range or throttle set too high.	[return]
24		Intake Air Temperature (IAT) or Vane Air Temperature (VAT) sensor out of range	[return]
25		Knock sensor not tested (ignore if not pinging).	[return]
26		Mass Air Flow (MAF) or Vane Air Flow (VAF) out of range.	[return]
26		Transmission Oil Temperature (TOT) sensor out of range.	[return]
27		Vehicle Speed Sensor problem.	[return]
27	(97LE)	Shift Lever position input fault	[return]
28		Vane Air Temperature (VAT) sensor out of range.	[return]
28		2.3L w/Electronic Ignition. Cyl ID, IDM low or right coil pack failure.	[return]
29	(97LE)	Engine Speed Sensor Fault	[return]
29		Vehicle Speed Sensor problem.	[return]
		EGR CODES DEPEND ON WHAT SYSTEM TYPE THE VEHICLE IS EQUIPPED WITH: EVP is for vehicles equipped with EGR solenoid(s), with or without an EVP sensor EVR is for vehicles equipped with an EGR Vacuum Regulator (EVR) and an EGR Valve Position (EVP) sensor PFE is for vehicles with Pressure Feedback EGR (PFE) sensor and and an EGR Vacuum Regulator (EVR) If you don't know what type of system you have, go to the EVP heading, which is the first one.
31	(KOEO, KOER, MEM)	EVP signal is/was out of range.	[return]
31	(KOEO, KOER, MEM)	EVP signal is/was low.	[return]
31	(KOEO, KOER, MEM)	PFE signal is/was low.	[return]
32	(KOER)	EGR not responding properly during test.	[return]
32	(KOEO, KOER, MEM)	EVR,EVP signal is/was low.	[return]
32	(KOER, MEM)	PFE shows low pressure, EGR not seating or memory, not seating intermittently.	[return]
33	(KOEO, MEM)	ALL. EGR did not open/ respond during test or if memory code, did not open intermittently.	[return]
34	(KOER)	EVP, EGR did not respond properly during test.	[return]
34	(KOER, MEM)	EVR, EVP sensor is/was high.	[return]
34	(KOEO, KOER, MEM)	PFE, PFE sensor is/was out of range.	[return]
35	(KOER)	EVP. Engine RPM's too low to test EGR system.	[return]
35	(KOEO, KOER, MEM)	EVR, EVP sensor signal is/was high.	[return]
35	(KOEO, KOER, MEM)	PFE, PFE sensor signal is/was high.	[return]
36	(97LE)	Shaft Speed Sensor Fault	[return]
38		Idle Tracking Switch signal was intermittent.	[return]
39		Transmission Torque Converter clutch not engaging.	[return]
40		SERIES FUEL/AIR INJECTION CODES ON VEHICLES WITH DUAL OXYGEN SENSORS REFER TO THE RIGHT OR REAR SENSOR. EXCEPT: 1984-1988 3.8L ENGINES: LEFT SENSOR	[return]
41	(KOER)	System lean.	[return]
41	(Mem)	System was lean for 15 seconds or more (no HO2S switching).	[return]
42	(KOER)	System rich.	[return]
42	(Mem)	System was rich for 15 seconds or more (no HO2S switching).	[return]
43	(KOER)	HO2S sensor not reading (run at 2000 rpm's for 2 minutes and retest. check for HO2S switching)	[return]
43	(Mem)	Was lean at WOT for 3 seconds or more.	[return]
44		AIR system inoperative.	[return]
45		AIR not Diverting (AIRD).	[return]
45		Electronic Ignition. coil primary circuit failure.	[return]
46		AIR Bypass (AIRB) not working.	[return]
46		Electronic Ignition. primary circuit failure coil 2.	[return]
47		Low flow unmetered air (check for small vacuum leaks, injector o'rings, gaskets etc.)	[return]
47		E4OD transmission 4x4 switch/circuit problem.	[return]
48		High flow unmetered air (check for large vacuum leak, inlet hoses etc.) Electronic Ignition. coil primary circuit failure.	[return]
49		Electronic Ignition. spout signal circuit problem. Transmission 1/2 shift problem.	[return]
51		Engine Coolant Temperature (ECT) sensor signal is/was too high.	[return]
52		Power Steering Pressure Switch/circuit open.	[return]
52	(KOER)	Did you turn wheel during test ?	[return]
53		Throttle Position sensor too high.	[return]
54		Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal high.	[return]
55		No or low (under 7.5 V) Key Power to PCM pin 5	[return]
56		Vane Air Flow (VAF) or Mass Air Flow (MAF) sensor high	[return]
56		Transmission Oil Temperature sensor too high. Transmissions	[return]
57		Intermittent in Park/Neutral/ Switch or Neutral Pressure switch circuit. 1990 Scorpio. Octane jumper installed (information only code. to inform you if it is installed or not)	[return]
58		Idle Tracking Switch (ITS) signal problem.	[return]
58		Vane Air Temperature (VAT) sensor out of range or open.	[return]
59		AXOD 4/3 circuit fault.	[return]
59		3.0L SHO. Low speed fuel pump circuit problem. Power / Fuel Pump Circuits	[return]
59		Transmission 2/3 shift problem. 1990 Scorpio. Idle jumper installed (information only code. to inform you if it is installed or not)	[return]
61		Engine Coolant Temperature (ECT) sensor is or was too low.	[return]
62	(KOEO)	AXOD (KOEO only) 3/2 circuit short to ground.	[return]
62	(KOEO, KOER)	AXOD (KOEO AND KOER) 4/3 circuit failure.	[return]
62		E4OD excessive converter clutch slippage.	[return]
63		Throttle Position Sensor (TPS) signal too low.	[return]
64		Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal low or grounded.	[return]
65		Check intermittent HO2S (signal or ground).	[return]
65	(KOER)	E4OD truck. cycle OD cancel switch after engine ID is received.	[return]
65		1984 3.8L ONLY. O, M Battery voltage high (check for electrical system overcharging)	[return]
66		Vane Air Flow (VAF) or Mass Air Flow (MAF) signal low.	[return]
66		Transmission Oil Temperature (TOT) signal low (possibly grounded).	[return]
67	(97LE)	Data Output Link Fault	[return]
67		Park/Neutral circuit fault.	[return]
67		Transmission Manual Lever Position (MLP) sensor circuit.	[return]
67	(Mem)	Intermittent Park Neutral Position (PNP) sensor fault.	[return]
68		Idle Tracking Switch (ITS) circuit (possibly grounded).	[return]
68		Vane Air Temperature (VAT) sensor out of range or grounded	[return]
68		3.8L AXOD.Transmission Temperature Switch (TTS) open	[return]
68		Electronic Transmission. Transmission Oil Temperature (TOT) sensor was overheated	[return]
69		AXOD transmission (KOEO) 3/2 switch closed (possible short circuit)	[return]
69		AXOD (Mem) 3/2 switch open (poss short to power)	[return]
69		E4OD 3/4 shift problem	[return]
70	(Mem)	3.8L AXOD. Data link to instrument cluster fault. Service any other EEC codes, erase memory and retest.	[return]
		If code is still present refer to instrument cluster diagnosis manual.	[return]
71	(Mem)	1.9L TBI, 2.3L TBI, 2.5L TBI. ITS signal was grounded when throttle should have been opening ITS. 4comp2.htm. ISC	[return]
		ISC motor problem or Idle Tracking Switch (ITS) signal wire shorted to ground	[return]
	(Mem)	1.9L MFI. PCM re-initialized. Possible electrical noise, case ground or intermittent VPWR problem.	[return]
	(Mem)	3.8L AXOD. Data link to instrument cluster fault. See code 70	[return]
72	(KOER)	No MAP or MAF change in "goose" test. retest, check for frequency or voltage change.	[return]
	(Mem)	1.9L MFI. VPWR circuit to PCM was intermittent.	[return]
	(Mem)	2.3L T/C. PCM re-initialized. Possible electrical noise, case ground or intermittent VPWR problem. powfuel.htm. VPWRDIAG	[return]
	(Mem)	3.8L AXOD. Message center data link circuit fault. See code 70	[return]
73	(KOEO)	Rerun test, if 73 is still output replace TPS	[return]
73	(KOER)	No Throttle Position Sensor (TPS) change in "goose" test. Must get at least 25% throttle rotation.	[return]
74		Was brake depressed after engine ID was received ?	[return]
74		Brake On Off (BOO) signal open or short to ground.	[return]
75		Brake On Off (BOO) signal shorted to power.	[return]
76		Vane Air Flow (VAF) did not respond to "goose" test. 4comp2.htm. VAF	[return]
77		System did not receive "goose" test.	[return]
78	(Mem)	VPWR circuit to PCM was intermittent or the PCM is bad	[return]
79		A/C is on or pin 10 is shorted to power	[return]
		80 SERIES CODES GENERALLY ARE CIRCUIT PROBLEMS THAT COULD BE WIRING, RELAY OR SOLENOID RELATED. ONLY ONE OF THE CIRCUITS LISTED UNDER THE CODE IS USED ON EACH VEHICLE. THE FAULT IS IN WHICHEVER SOLENOID OR CIRCUIT IS PRESENT ON THE VEHICLE
81		Boost control solenoid. 4comp2.htm. SOL	[return]
81		AIRD solenoid.	[return]
81		3.0L SHO. Inlet Air Solenoid	[return]
82		2.3L TC. Fan Control wire shorted to ground.	[return]
82		AIRB solenoid.	[return]
82		3.8L SC. Super Charger Bypass Solenoid.	[return]
83		High Electro Drive Fan circuit fault.	[return]
83		EGR Control solenoid.	[return]
83		3.0L SHO. Low Speed Fuel Pump Relay circuit.	[return]
84		EGR Vacuum Regulator. 4comp2.htm.	[return]
84		EGR cutoff solenoid.	[return]
84		EGR Vent solenoid.	[return]
85		2.3L T/C Automatic. 3/4-4/3 Shift solenoid.	[return]
85		CANP solenoid (ALL 1989).	[return]
85	(Mem)	1.9L MFI. System has corrected rich condition.	[return]
86		2.3L or 2.9L Truck. A4LD 3/4 shift solenoid.	[return]
86	(Mem)	1.9L MFI. System has corrected lean condition.	[return]
87	(KOEO)	Fuel pump circuit fault (check inertia switch).	[return]
87		Vehicles with 2BBL carb. Temperature Compensated Accelerator Pump Solenoid.	[return]
87	(Mem)	intermittent in fuel pump primary circuit.	[return]
87		NOTE: On some Escorts with automatic seat belts this code is normal IN MEMORY due to the wiring	[return]
88		Throttle Kicker Solenoid. 4comp2.htm. SOL	[return]
88		Variable Voltage Choke relay circuit fault.	[return]
88		Fan Control circuit fault.	[return]
88		A4LD. Converter Clutch Override solenoid.	[return]
88		Electronic Ignition. IDM, DPI or spout circuit fault.	[return]
89		A4LD. Converter Clutch Override solenoid. trans4.htm	[return]
89		AXOD Torque Converter Control solenoid circuit.	[return]
89		Exhaust Heat Control (heat riser) solenoid circuit.	[return]
		90 SERIES FUEL/AIR INJECTION CODES ON VEHICLES WITH DUAL OXYGEN SENSORS REFER TO THE LEFT OR FRONT SENSOR. EXCEPT: 1984-1988 3.8L ENGINES: RIGHT SENSOR
91		(R, MEM) System running lean. 4fuel.htm	[return]
91	(97LE)	Transmission SS 1 circuit/solenoid problem.	[return]
92	(KOER)	System running rich. 4fuel.htm	[return]
92	(97LE)	Transmission SS 2 circuit/solenoid problem.	[return]
93	(97LE)	Transmission SS 3 circuit/solenoid problem.	[return]
93	(KOEO)	Throttle linkage binding or bad ISC motor. (KOER) HO2S not reading. 4fuel.htm	[return]
93		Transmission TCC circuit/solenoid problem.	[return]
94	(97LE)	Transmission SS 4 circuit/solenoid problem.	[return]
94		AIR system inoperative. 4comp2.htm. AIR	[return]
94		Transmission TCC circuit/solenoid problem.	[return]
95	(97LE)	Transmission SS 5 (VPS) circuit/solenoid problem.	[return]
95	(KOEO)	Fuel pump: open, bad ground or always on.	[return]
95	(KOEO)	AIR not Diverting (AIRD).	[return]
95		(Mem) Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM (Fuel Pump Monitor signal).	[return]
96	(97LE)	Transmission SS 6 (line pressure) circuit/solenoid problem.	[return]
96	(KOEO)	Fuel pump monitor circuit shows no power.	[return]
96	(KOEO)	AIR Bypass (AIRB) not working.	[return]
96		(Mem) (Service 87 code first if present) Fuel pump relay or battery power feed was open.	[return]
97	(97LE)	Transmission SS 7 (lockup) circuit/solenoid failure.	[return]
97		E4OD OD cancel light circuit failure.	[return]
98	(KOER)	Did not pass KOEO yet (Get 11 in KOEO first)	[return]
98	(97LE)	Transmission EPC circuit/solenoid failure.	[return]
99	(KOER)	ISC needs to learn (Let idle for 2 minutes Erase memory and retest)	[return]
99		Transmission EPC circuit/solenoid failure. trans4.htm	[return]
		EGR CODES DEPEND ON WHAT SYSTEM TYPE THE VEHICLE IS EQUIPPED WITH:	[return]
		EVP is for vehicles equipped with EGR solenoid(s), with or without an EVP sensor	[return]
		EVR is for vehicles equipped with an EGR Vacuum Regulator (EVR) and an EGR Valve Position (EVP) sensor	[return]
		PFE is for vehicles with Pressure Feedback EGR (PFE) sensor and an EGR Vacuum Regulator (EVR)	[return]
		If you don't know what type of system you have, go to the EVP heading, which is the first one.	[return]

Error Code	Code Meaning	Possible Causes
12	The EEC is unable to control idle	vacuum leak, TB base idle off, idle air valve dirty or bad, EGR stuck open
13	Idle is out of spec.	same as code 12
14	Intermittant PIP	TFI module most likely bad, but mag pickup could be bad
15	ECM Keep Alive Memory failure	Battery dead or disconnected, bad power ECM relay or fuse. Some after market chips can cause this error.
16	RPM to low.	bad idle air valve, dirty throttle body
17	O2 sensor rich	Fuel regulator,map sensor bad, no vacuum to MAP, bad injector,dead O2 sensor.
18	no tach signal	Bad TFI, bad mag pickup, DIS bad coil
19	ECM failure	ECM dead or dying
21	21 ECT out of range	ECT bad, engine not warmed up, bad thermostat, low coolant.
22	22 MAP out of spec	Bad MAP sensor, vacuum leak, bad hose to MAP sensor
23	TPS out of range	Bad TPS, throttle body base idle mis-set, dirty/sticking TB, no dynamic response
24	ACT/VAT out of range	Bad ACT/VAT sensor, on EDIS systems coil 1 bad
26	VAF/MAF out of range	Bad VAF/MAF, leaking air hose from sensor to engine
27	VSS	Vehicle Speed Sensor bad or unplugged, EDIS coil 2 bad
28	VAT Sensor Low.	VAT bad, leak in hose from VAT to engine, EDIS coil 3 bad, DIS right coil bad
29	Vehicle Speed Sensor low	Bad or unplugged VSS,
31	EVP/PFE low	Bad EVP/PFE sensor, no exhaust backpressure or inopperative EGR
32	EVP/PFE high	EGR sticking open, bad EVP/PFE sensor, clogged exhaust or convertor
33	EGR not opening	Clogged or bad EGR, bad EVP/PFE sensor, and even a sluggish O2 can set this.
34	EVP/PFE high	Same as code 32
35	EVP/PFE high	Same as codes 32 and 34
38	ITS open	Bad or unplugged ITS
39	Lock-up convertor	Lock-up solenoid bad or unplugged
41	O2 low (lean)	Vacuum leak, EGR stuck open,bad MAP sensor, bad O2, clogged fuel filter,weak fuel pump
42	42 O2 high	Bad O2, bad MAP sensor, Bad fuel regulator, Leaking injectors, restriction in fuel return line, clogged exhaust lowering vacuum
43	O2 lean at WOT	Bad O2, bad MAP sensor, and same as code 41
45	EDIS	coil bad EDIS coil 1, 2, 3, or 4 failed
46	EDIS coil	EDIS coil 2 failed
47	O2 rich, VAF low	Same as code 42, VAF bad, leak in hose from VAF to engine, Air filter dirty
48	VAF high, DIS coil	DIS coil 3 failed, VAF bad.
49	EDIS SAW spout	TFI bad, spout unplugged, SAW signal bad
51	ECT high	Bad ECT, sticking thermostat, low coolant, clogged convertor.
52	PSPS open	Bad or unplugged PSPS, no dynamic response
53	TPS high	Bad TPS, dirty/sticking TB, base idle set wrong, throttle cable sticking
54	ACT/VAT high	Bad or unplugged ACT/VAT, inop heated air inlet.
55	Key power low	Short in wiring to ECM power, low charging from alternator.
56	MAF/VAF	high Bad MAF/VAF
58	VAT high	Bad VAT
59	Low speed fuel pump	Bad fuel pump,wiring to pump.
61	ECT low	Bad ECT, or thermostat, engine not warm, low coolant.
62	Convertor clutch	Convertor bad, lockup solenoid bad or unplugged.
63	TPS low	Bad or misadjusted TPS, TB base idle mis-set, binding throttle cable
64	ACT/VAT	low Bad ACT/VAT
65	Voltage high	Alternator bad, overcharging, voltage over 17 volts
66	MAF/VAF low	Bad MAF/VAF, leak in hose from MAF/VAF to engine.
68	VAT	low Bad VAT
70	ECM DCL	Data communication link error, bad ECM
71	ECM software reset	???
72	MAP	No change in MAP signal, no dynamic response usually sets this.
73	TPS	No change in TPS signal, no dynamic response sets this.
74	BOO	Usually sets when brakes aren't tapped during dynamic response.
75	BOO closed	Bad or mis-adjusted BOO switch
76	VAF	NO change in VAF during dynamic response.
77	No dynamic response	no one performed the dynamic responses during code retrieval
78	Power interrupt	Interruption in ECM power, battery disconnected, ECM power relay bad.
79	A/C on	A/C was on during self-test
83	EGR	Fuel relay Bad or unplugged EGR solenoid, low speed fuel pump relay bad
84	EGR solenoid	Same as code 83
85	CANP, lean limit	Problem with the CANP, a rich condition causing the ECM to hit its lean limit.
86	ECM rich limit	ECM hit rich limit, due to a lean condition, vacuum leak, fuel filter, fuel pump
87	Fuel pump relay	Failure of the fuel pump power relay or circuit
88	COO solenoid	Failure of the convertor over-ride solenoid, or circuit
89	LUS/COO solenoid	Same as code 88
91	O2 lean	Bad O2, vacuum leak,fuel pressure low (clogged filter, regulator, pump) EGR stuck open
93	TPS low	Same as code 63
95	Fuel pump	Fuel pump monitor has seen a fault in the fuel pumps or circuit
96	High speed fuel pump	High speed fuel pump or circuit failure
98	Failure mode	Some failure has set ECM in 'failure effects mode', bad ECM, or could be about anything
99	ECM cannot control idle	Usually found with codes 12, and 13. Same things cause it.

11 System checks OK -

12 Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too low) - ISC

13 (O) ISC did not respond properly (extends to touch throttle then retracts for KOEO) - ISC
(R) Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too high)
(M) ISC sticking, open ITS circuit or TP sticking

14 Ignition pickup was erratic - Ignition Systems
E4OD Transmission diesel RPM sensor - Diesel RPM sensor

15 (O) No Keep Alive Memory power to PCM pin 1 or bad PCM (Memory Test Failure)
(M) KAM (pin 1) was interrupted (was battery disconnected ?)

16 1.9L & 2.5L - Throttle stop set too high - IDLE or Idle Set Procedures
2.3L - RPM's too low - IDLE
(O) Electronic ignition - IDM circuit fault - Ignition Systems

17 1.9L & 2.5L - Throttle stop set too low - IDLE

18 (R) Check base timing & advance function - Timing Tests
(M) Ignition TACH signal erratic - Ignition Systems

19 (O) No Vehicle Power (pins 37 + 57) or bad PCM VPWR Diagnosis
(R) Erratic idle during test (reset throttle & retest) - Idle Set Procedures
Electronic ignition Cylinder ID sensor/circuit problem - Ignition Systems

21 Engine Coolant Temperature (ECT) sensor out of range - ECT

22 MAP (vacuum) or BARO signal out of range - MAP

23 Throttle sensor out of range or throttle set too high - TPS

24 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) sensor out of range - IAT VAT

25 Knock sensor not tested (ignore if not pinging) - KS

26 Mass Air Flow (MAF) or Vane Air Flow (VAF) out of range - MAF VAF
Transmission Oil Temperature (TOT) sensor out of range - Transmissions

27 Vehicle Speed Sensor problem - VSS

28 Vane Air Temperature (VAT) sensor out of range - VAT
2.3L w/Electronic Ignition - Cyl ID, IDM low or right coil pack failure - Ignition Systems

29 Vehicle Speed Sensor problem - VSS

EGR CODES DEPEND ON WHAT SYSTEM TYPE THE VEHICLE IS EQUIPPED WITH:

EVP is for vehicles equipped with EGR solenoid(s), with or without an EVP sensor

EVR is for vehicles equipped with an EGR Vacuum Regulator (EVR) and an EGR Valve Position (EVP) sensor

PFE is for vehicles with Pressure Feedback EGR (PFE) sensor and and an EGR Vacuum Regulator (EVR)

If you don't know what type of system you have, go to the EVP heading, which is the first one.
There are pictures under the different headings to help you identify the system.

31 EVP - (O, R, M) EVP signal is/was out of range - EVP
EVR - (O, R, M) EVP signal is/was low - EVR
PFE - (O, R, M) PFE signal is/was low - PFE

32 EVP - (R) EGR not responding properly during test - EVP
EVR - (O, R, M) EVP signal is/was low - EVR
PFE - (R, M) PFE shows low pressure, EGR not seating or memory, not seating intermittently - PFE

33 ALL - (O, M) EGR did not open/ respond during test or if memory code, did not open intermittently - EVP EVR PFE

34 EVP - (R) EGR did not respond properly during test - EVP
EVR - (O, R, M) EVP sensor is/was high - EVR
PFE - (O, R, M) PFE sensor is/was out of range - PFE

35 EVP - (R) Engine RPM's too low to test EGR system - EVP
EVR - (O, R, M) EVP sensor signal is/was high - EVR
PFE - (O, R, M) PFE sensor signal is/was high - PFE

38 Idle Tracking Switch signal was intermittent - ISC

39 Transmission Torque Converter clutch not engaging - Transmissions

40 SERIES FUEL/AIR INJECTION CODES ON VEHICLES WITH DUAL OXYGEN SENSORS REFER TO THE RIGHT OR REAR SENSOR. EXCEPT: 1984-1988 3.8L ENGINES: LEFT SENSOR

41 (R) System lean - Fuel control
(M) System was lean for 15 seconds or more (no HO2S switching) - Fuel control

42 (R) System rich - Fuel control
(M) System was rich for 15 seconds or more (no HO2S switching) - Fuel control

43 (R) HO2S sensor not reading (run at 2000 rpm's for 2 minutes and retest - check for HO2S switching)
(M) Was lean at WOT for 3 seconds or more - Fuel control

44 AIR system inoperative - Air Injection

45 AIR not Diverting (AIRD) - Air Injection
Electronic Ignition - coil primary circuit failure - Ignition Systems

46 AIR Bypass (AIRB) not working - Air Injection
Electronic Ignition - primary circuit failure coil 2 - Ignition Systems

47 Low flow unmetered air (check for small vacuum leaks, injector o'rings, gaskets etc.)
E4OD transmission 4x4 switch/circuit problem - Transmissions

48 High flow unmetered air (check for large vacuum leak, inlet hoses etc.)
Electronic Ignition - coil primary circuit failure - Ignition Systems

49 Electronic Ignition - spout signal circuit problem - Ignition Systems
Transmission 1/2 shift problem - Transmissions

51 Engine Coolant Temperature (ECT) sensor signal is/was too high - ECT

52 Power Steering Pressure Switch/circuit open - PSP
(R) Did you turn wheel during test ?

53 Throttle Position sensor too high - TPS

54 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal high - IAT VAT

55 No or low (under 7.5 V) Key Power to PCM pin 5

56 Vane Air Flow (VAF) or Mass Air Flow (MAF) sensor high - VAF MAF
Transmission Oil Temperature sensor too high - Transmissions

57 Intermittent in Park/Neutral/ Switch or Neutral Pressure switch circuit - PNP or Transmissions
1990 Scorpio - Octane jumper installed (information only code - to inform you if it is installed or not)

58 Idle Tracking Switch (ITS) signal problem ISC
Vane Air Temperature (VAT) sensor out of range or open - VAT

59 AXOD 4/3 circuit fault - Transmissions
3.0L SHO - Low speed fuel pump circuit problem - Power / Fuel Pump Circuits
Transmission 2/3 shift problem - Transmissions
1990 Scorpio - Idle jumper installed (information only code - to inform you if it is installed or not)

61 Engine Coolant Temperature (ECT) sensor is or was too low - ECT

62 AXOD (KOEO only) 3/2 circuit short to ground - Transmissions
AXOD (KOEO AND KOER) 4/3 circuit failure - Transmissions
E4OD excessive converter clutch slippage - Transmissions

63 Throttle Position Sensor (TPS) signal too low TPS

64 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal low or grounded - IAT VAT

65 Check intermittent HO2S (signal or ground) - Fuel Control
(R) E4OD truck - cycle OD cancel switch after engine ID is received - Transmissions
1984 3.8L ONLY - O, M Battery voltage high (check for electrical system overcharging)

66 Vane Air Flow (VAF) or Mass Air Flow (MAF) signal low - VAF MAF
Transmission Oil Temperature (TOT) signal low (possibly grounded) - Transmissions

67 Park/Neutral circuit fault - PNP
Transmission Manual Lever Position (MLP) sensor circuit - Transmissions
(M) Intermittent Park Neutral Position (PNP) sensor fault - PNP

68 Idle Tracking Switch (ITS) circuit (possibly grounded) - ISC
Vane Air Temperature (VAT) sensor out of range or grounded - VAT
3.8L AXOD -Transmission Temperature Switch (TTS) open - Transmissions
Electronic Transmission - Transmission Oil Temperature (TOT) sensor was overheated - Transmissions

69 AXOD transmission (O) 3/2 switch closed (possible short circuit) - Transmissions
AXOD (M) 3/2 switch open (poss short to power) - Transmissions
E4OD 3/4 shift problem - Transmissions

70 (M) 3.8L AXOD - Data link to instrument cluster fault. Service any other EEC codes, erase memory and retest.
If code is still present refer to instrument cluster diagnosis manual.

71 (M) 1.9L TBI, 2.3L TBI, 2.5L TBI - ITS signal was grounded when throttle should have been opening ITS - ISC
ISC motor problem or Idle Tracking Switch (ITS) signal wire shorted to ground - ISC
(M) 1.9L MFI - PCM re-initialized. Possible electrical noise, case ground or intermittent VPWR problem - VPWR Diagnosis
(M) 3.8L AXOD - Data link to instrument cluster fault - See code 70

72 (R) No MAP or MAF change in "goose" test - retest, check for frequency or voltage change - MAP MAF
(M) 1.9L MFI - VPWR circuit to PCM was intermittent - VPWR Diagnosis
(M) 2.3L T/C - PCM re-initialized. Possible electrical noise, case ground or intermittent VPWR problem - VPWR Diagnosis
(M) 3.8L AXOD - Message center data link circuit fault - See code 70

73 (O) Rerun test, if 73 is still output replace TPS
(R) No Throttle Position Sensor (TPS) change in "goose" test. Must get at least 25% throttle rotation - TPS

74 Was brake depressed after engine ID was received ?
Brake On Off (BOO) signal open or short to ground - BOO

75 Brake On Off (BOO) signal shorted to power - BOO

76 Vane Air Flow (VAF) did not respond to "goose" test - VAF

77 System did not receive "goose" test -

78 (M) VPWR circuit to PCM was intermittent or the PCM is bad VPWR Diagnosis

79 A/C is on or pin 10 is shorted to power

80 SERIES CODES GENERALLY ARE CIRCUIT PROBLEMS THAT COULD BE WIRING, RELAY OR SOLENOID RELATED.
ONLY ONE OF THE CIRCUITS LISTED UNDER THE CODE IS USED ON EACH VEHICLE. THE FAULT IS IN WHICHEVER SOLENOID OR CIRCUIT IS PRESENT ON THE VEHICLE

81 Boost control solenoid - Solenoids
AIRD solenoid - Solenoids and Air Injection
3.0L SHO - Inlet Air Solenoid - Solenoids

82 2.3L TC - Fan Control wire shorted to ground - A/C and Fan Circuits
AIRB solenoid - Solenoids and Air Injection
3.8L SC - Super Charger Bypass Solenoid - Solenoids

83 High Electro Drive Fan circuit fault - A/C and Fan Circuits
EGR Control solenoid - Solenoids
3.0L SHO - Low Speed Fuel Pump Relay circuit - Power / Fuel Pump Circuits

84 EGR Vacuum Regulator - Solenoids
EGR cutoff solenoid - Solenoids
EGR Vent solenoid - Solenoids

85 2.3L T/C Automatic - 3/4-4/3 Shift solenoid - Transmissions
CANP solenoid (ALL 1989) - Solenoids
(M) 1.9L MFI - System has corrected rich condition - Fuel control

86 2.3L or 2.9L Truck - A4LD 3/4 shift solenoid - Transmissions
(M) 1.9L MFI - System has corrected lean condition - Fuel control

87 (O) Fuel pump circuit fault (check inertia switch) - Power / Fuel Pump Circuits
Vehicles with 2BBL carb - Temperature Compensated Accelerator Pump Solenoid - Solenoids
(M) intermittent in fuel pump primary circuit - Power / Fuel Pump Circuits
NOTE: On some Escorts with automatic seat belts this code is normal IN MEMORY due to the wiring

88 Throttle Kicker Solenoid - Solenoids
Variable Voltage Choke relay circuit fault - VVC
Fan Control circuit fault - A/C and Fan Circuits
A4LD - Converter Clutch Override solenoid - Transmissions
Electronic Ignition - IDM, DPI or spout circuit fault - Ignition Systems

89 A4LD - Converter Clutch Override solenoid - Transmissions
AXOD Torque Converter Control solenoid circuit - Transmissions
Exhaust Heat Control (heat riser) solenoid circuit - Solenoids

90 SERIES FUEL/AIR INJECTION CODES ON VEHICLES WITH DUAL OXYGEN SENSORS REFER TO THE LEFT OR FRONT SENSOR. EXCEPT: 1984-1988 3.8L ENGINES: RIGHT SENSOR

91 (R, M) System running lean - Fuel control
Transmission SS 1 circuit/solenoid problem - Transmissions

92 (R) System running rich - Fuel control
Transmission SS 2 circuit/solenoid problem - Transmissions

93 (O) Throttle linkage binding or bad ISC motor ISC (R) HO2S not reading - Fuel control
Transmission TCC circuit/solenoid problem - Transmissions

94 AIR system inoperative - Air Injection
Transmission TCC circuit/solenoid problem - Transmissions

95 (O) Fuel pump: open, bad ground or always on - Power / Fuel Pump Circuits
(R) AIR not Diverting (AIRD) - Air Injection
(M) Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM (Fuel Pump Monitor signal) - Power / Fuel Pump Circuits

96 (O) Fuel pump monitor circuit shows no power - Power / Fuel Pump Circuits
(R) AIR Bypass (AIRB) not working - Air Injection
(M) (Service 87 code first if present) Fuel pump relay or battery power feed was open - Power / Fuel Pump Circuits

97 E4OD OD cancel light circuit failure - Transmissions

98 (R) Did not pass KOEO yet (Get 11 in KOEO first)
Transmission EPC circuit/solenoid failure - Transmissions

99 (R) ISC needs to learn (Let idle for 2 minutes; Erase memory and retest)
Transmission EPC circuit/solenoid failure - Transmissions

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	21	22	23	24	25	26	27	28	29
	31	32	33	34	35	36		38	39
40	41	42	43	44	45	46	47	48	49
	51	52	53	54	55	56	57	58	59
	61	62	63	64	65	66	67	68	69
70	71	72	73	74	75	76	77	78	79
80	81	82	83	84	85	86	87	88	89
90	91	92	93	94	95	96	97	98	99

10	11	12	13	14	15	16	17	18	19
	21	22	23	24	25	26	27	28	29
	31	32	33	34	35	36		38	39
40	41	42	43	44	45	46	47	48	49
	51	52	53	54	55	56	57	58	59
	61	62	63	64	65	66	67	68	69
70	71	72	73	74	75	76	77	78	79
80	81	82	83	84	85	86	87	88	89
90	91	92	93	94	95	96	97	98	99

10	11	12	13	14	15	16	17	18	19
	21	22	23	24	25	26	27	28	29
	31	32	33	34	35	36		38	39
40	41	42	43	44	45	46	47	48	49
	51	52	53	54	55	56	57	58	59
	61	62	63	64	65	66	67	68	69
70	71	72	73	74	75	76	77	78	79
80	81	82	83	84	85	86	87	88	89
90	91	92	93	94	95	96	97	98	99