Mustang EEC-IV Diagnostic Codes
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Old January 4th, 2008, 02:44 PM   18 links from elsewhere to this Post. Click to view. #1
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Mustang EEC-IV Diagnostic Codes


dunno if yall wanna make this a sticky or what but i thought it to be helpful...


11 - System pass
12 - RPM unable to reach upper test limit
13 - RPM unable to reach lower test limit
14 - Pip circuit failure
15 - PCM read only memory test failed
15 - PCM keep alive memory test failed
P0121 In-Range Operating Throttle Position Sensor circuit failure.
P0122 Throttle Position Sensor circuit Low Input.
P0123 Throttle Position Sensor circuit High Input.
P0125 Insufficient Coolant Temperature to enter Closed Loop.
P0126 Insufficient Coolant Temperature for Stable Operation.
16 - IDM signal not received
18 - SPOUT circuit open or spark angle word failure
18 - IDM circuit failure or SPOUT circuit grounded
21 - ECT out of self-test range
22 - BP sensor out of self-test range
22 - BP sensor or MAP out of range
23 - TP sensor out of self-test range
24 - ACT sensor out of self-test range
25 - Knock not sensed during dynamic test
26 - VAF/MAF out of self-test range
26 - TOT out of self-test range
26 - TOT sensor out of self-test range (E4OD)
28 - Loss of IDM, right side
29 - Insufficient input from vehicle speed sensor
31 - PFE, EVP or EVR circuit below minimum voltage
32 - EVP voltage below closed limit
33 - EGR valve opening not detected
34 - EVP voltage above closed limit
35 - PFE or EVP circuit above closed limit
41 - HEGO sensor circuit indicates system lean
41 - No HEGO switching detected
42 - HEGO sensor circuit indicates system rich
44 - Thermactor air system inoperative-right side
45 - Thermactor air upstream during self-test
45 - Coil 1, 2 or 3 failure
46 - Thermactor air not bypassed during self-test
47 - 4WD switch closed (E4OD)
48 - Loss of IDM, left side
49 - 1-2 shift error (E4OD)
51 - ECT/ACT reads -40F or circuit open
52 - Power steering pressure switch circuit open
52 - Power steering pressure switch always open or closed
53 - TP circuit above maximum voltage
54 - ACT sensor circuit open
56 - VAF or MAF circuit above maximum voltage
56 - TOT reads -40F or circuit open (E4OD)
59 - 2-3 shift error (E4OD)
61 - ECT reads 254F or circuit grounded
63 - TP circuit below minimum voltage
64 - ACT sensor grounded or input reads 254F
65 - Overdrive cancel switch open, no change seen (E4OD)
66 - MAF sensor input below minimum voltage
66 - TOT grounded or reads 290F (E4OD)
67 - Neutral/drive switch open or A/C on
67 - Clutch switch circuit failure
67 - MLP sensor out of range or A/C on (E4OD)
69 - 3-4 shift error
72 - Insufficient MAF/MAP change during dynamic test
73 - Insufficient TP change during dynamic test
74 - Brake on/off switch failure or not actuated
77 - Operator error
79 - A/C on during self-test
79 - A/C or defrost on during self-test
81 - Air management 2 circuit failure
82 - Air management 1 circuit failure
84 - EGR vacuum solenoid circuit failure
85 - Canister purge solenoid circuit failure
86 - Shift solenoid circuit failure
87 - Fuel pump primary circuit failure
88 - Loss of dual plug input control
89 - Converter clutch solenoid circuit failure
91 - Shift solenoid 1 circuit failure (E4OD)
92 - Shift solenoid 2 circuit failure (E4OD)
93 - Coast clutch solenoid circuit failure (E4OD)
94 - Converter clutch solenoid circuit failure (E4OD)
95 - Fuel pump secondary circuit failure - PCM to ground
96 - Fuel pump secondary circuit failure - battery to PCM
97 - Overdrive cancel indicator light - circuit failure (E4OD)
98 - Electronic pressure control driver open in PCM (E4OD)
98 - Hard fault present
99 - Electronic pressure control circuit failure (E4OD)
111 - System pass
112 - ACT sensor circuit grounded or reads 254F
113 - ACT sensor circuit open or reads -40F
114 - ACT outside test limits during KOEO or KOER tests
116 - ECT outside test limits during KOEO or KOER tests
117 - ECT sensor circuit grounded
117 - ECT sensor circuit below minimum voltage or reads 254F
118 - ECT sensor circuit open
118 - ECT sensor circuit below maximum voltage or reads -40F
121 - Closed throttle voltage higher or tower than expected
122 - TP sensor circuit below minimum voltage
123 - TP sensor circuit below maximum voltage
126 - BP or MAP sensor higher or lower than expected
128 - MAP vacuum circuit failure
129 - Insufficient MAF or MAP change during dynamic responded test
144 - No HEGO switching detected
167 - Insufficient TP change during dynamic response test
171 - Fuel system at adaptive limit, HEGO unable to switch
172 - HEGO shows system always lean
173 - HEGO shows system always rich
174 - HEGO switching time is slow
179 - Fuel at lean adaptive limit at part throttle; system rich
181 - Fuel at rich adaptive limit at part throttle; system lean
182 - Fuel at lean adaptive limit at idle; system rich
183 - Fuel at rich adaptive limit at idle; system lean
211 - PIP circuit fault
212 - Loss of IDM input to PCM or SPOUT circuit grounded
213 - Spout circuit open
224 - Erratic IDM input to processor
225 - Knocked not sensed during dynamic response test
311 - Thermactor air system inoperative
312 - Thermactor air upstream during self-test
313 - Thermactor air not bypassed during self-test
327 - EVP or DPFE circuit below minimum voltage
328 - EGR closed voltage higher than expected
332 - Insufficient EGR flow detected
334 - EGR closed voltage higher than expected
337 - EVP or DPFE circuit above maximum voltage
411 - Cannot control rpm during KOER low rpm check
412 - Cannot control rpm during KOER high rpm check
452 - Insufficient input from vehicle speed sensor
511 - EEC processor ROM test failed
512 - EEC processor Keep Alive Memory test failed
513 - Failure in EEC processor internal voltage
519 - Power steering pressure switch circuit open
521 - Power steering pressure switch did not change state
525 - Vehicle in gear or A/C on during self-test
536 - Brake on/off circuit failure, switch not actuated during KOER test
538 - Insufficient RPM change during KOER dynamic response test
538 - Operator error
542 - Fuel pump secondary circuit failure: PCM to ground
543 - Fuel pump secondary circuit failure: Battery to PCM
552 - Air management 1 circuit failure
553 - Air management 2 circuit failure
556 - Fuel pump primary circuit failure
558 - EGR vacuum regulator circuit failure
565 - Canister purge circuit failure
569 - Canister purge 2 circuit failure
617 - 1-2 shift error (E4OD)
618 - 2-3 shift error (E4OD)
619 - 3-4 shift error (E4OD)
621 - Shift solenoid 1 circuit failure
622 - Shift solenoid 2 circuit failure
624 - EPC solenoid or driver circuit failure
625 - EPC driver open in PCM
626 - Coast clutch solenoid circuit failure (E4OD)
627 - Converter clutch solenoid circuit failure (E4OD)
628 - Converter clutch error (E4OD)
629 - Converter clutch control circuit failure
631 - Overdrive cancel indicator light circuit failure
632 - Overdrive cancel switch not changing states (E4OD)
633 - 4WD switch is closed
634 - MLP sensor voltage out of self-test range, A/C on
636 - TOT sensor voltage out of self-test range
637 - TOT sensor circuit above maximum voltage
638 - TOT sensor circuit below minimum voltage
654 - MLP sensor not in park position
998 - Hard fault present

Definitions:

ACT = Air Charge Temperature Sensor
BP = See MAP
EEC = Electronic Engine Control System
ECT = Engine Coolant Temperature Sensor
EGR = Exhaust Gas Recirculation Valve
EVP = EGR Valve Position Sensor
HEGO = Heated Exhaust Gas Oxygen Sensor
KOEO = Key On Engine Off
KOER = Key On Engine Running
MAF = Mass Air Flow Sensor
MAP = Manifold Absolute Pressure Sensor
MLP = Manual Lever Position
PCM = Powertrain Control Module
SPOUT = Distributor Jumper to Allow Initial Timing
TP = Throttle Position Sensor
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