EEC IV 2 DIGIT CODES

Differences in test mode noted as:

(O) = Key On Engine Off test
(R) = Key On Engine Running test
(M) = Memory code

11 System checks OK –

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

13 (O) ISC did not respond properly (extends to touch throttle then retracts for KOEO)
(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
E4OD Transmission 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
2.3L – RPM’s too low
(O) Electronic ignition – IDM circuit fault

17 1.9L & 2.5L – Throttle stop set too low

18 (R) Check base timing & advance function
(M) Ignition TACH signal erratic

19 (O) No Vehicle Power (pins 37 + 57) or bad PCM
(R) Erratic idle during test (reset throttle & retest)
Electronic ignition Cylinder ID sensor/circuit problem

21 Engine Coolant Temperature (ECT) sensor out of range

22 MAP (vacuum) or BARO signal out of range

23 Throttle sensor out of range or throttle set too high

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

25 Knock sensor not tested (ignore if not pinging)

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

27 Vehicle Speed Sensor problem

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

29 Vehicle Speed Sensor problem

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
EVR – (O, R, M) EVP signal is/was low
PFE – (O, R, M) PFE signal is/was low

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

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

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

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

38 Idle Tracking Switch signal was intermittent

39 Transmission Torque Converter clutch not engaging

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
(M) System was lean for 15 seconds or more (no HO2S switching)

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

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

44 AIR system inoperative

45 AIR not Diverting (AIRD)
Electronic Ignition – coil primary circuit failure

46 AIR Bypass (AIRB) not working
Electronic Ignition – primary circuit failure coil 2

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

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

49 Electronic Ignition – spout signal circuit problem
Transmission 1/2 shift problem

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

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

53 Throttle Position sensor too high

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

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
Transmission Oil Temperature sensor too high

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)

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

59 AXOD 4/3 circuit fault
3.0L SHO – Low speed fuel pump circuit problem
Transmission 2/3 shift problem
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

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

63 Throttle Position Sensor (TPS) signal too low

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

65 Check intermittent HO2S (signal or ground)
(R) E4OD truck – cycle OD cancel switch after engine ID is received
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
Transmission Oil Temperature (TOT) signal low (possibly grounded)

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

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

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

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 motor problem or Idle Tracking Switch (ITS) signal wire shorted to ground
(M) 1.9L MFI – PCM re-initialized. Possible electrical noise, case ground or intermittent VPWR problem
(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
(M) 1.9L MFI – VPWR circuit to PCM was intermittent
(M) 2.3L T/C – PCM re-initialized. Possible electrical noise, case ground or intermittent VPWR problem
(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

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

75 Brake On Off (BOO) signal shorted to power

76 Vane Air Flow (VAF) did not respond to “goose” test

77 System did not receive “goose” test – see TESTS

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

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
AIRD solenoid
3.0L SHO – Inlet Air Solenoid

82 2.3L TC – Fan Control wire shorted to ground
AIRB solenoid
3.8L SC – Super Charger Bypass Solenoid

83 High Electro Drive Fan circuit fault
EGR Control solenoid
3.0L SHO – Low Speed Fuel Pump Relay circuit

84 EGR Vacuum Regulator
EGR cutoff solenoid
EGR Vent solenoid

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

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

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

88 Throttle Kicker Solenoid
Variable Voltage Choke relay circuit fault
Fan Control circuit fault
A4LD – Converter Clutch Override solenoid
Electronic Ignition – IDM, DPI or spout circuit fault

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

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
Transmission SS 1 circuit/solenoid problem

92 (R) System running rich
Transmission SS 2 circuit/solenoid problem

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

94 AIR system inoperative
Transmission TCC circuit/solenoid problem

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

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

97 E4OD OD cancel light circuit failure

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

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

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