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EEC IV Diagnostic Codes for 89 - 97 Thunderbird/Cougar

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#1 ·
The following is a list of codes for the Ford EEC IV diagnostic test for the 89-97 Thunderbird & Cougar. These codes are not to be used for any other type of computer.

These codes will help in the diagnosis of any problems you may have with your car. Some cars, (depending on year) give a 2 digit code, others give a 3 digit code, make sure you check how many digits your car gives before performing a diagnosis. Both 2 and 3 digit codes are listed below.

Code -- Meaning
11 -- System pass
12 -- RPM not within self-test upper limit
13 -- RPM not within self-test lower limit
14 -- Profile Ignition Pickup circuit failure
15 -- Read Only Memory test failed
15 -- Keep Alive Memory test failed
16 -- RPM too low to perform Oxygen sensor/fuel test (5.0L only)
18 -- Loss of TACH input to ECA; SPOUT circuit grounded
18 -- SPOUT circuit open
19 -- Distributorless Ignition Cylinder identification circuit failure (3.8L SC only)
19 -- Failure in EEC reference voltage (except 3.8L SC)
21 -- Coolant Temperature Sensor (CTS) out of range
22 -- Manifold Absolute/Baro Pressure Sensor out of range
23 -- Throttle Position Sensor (TPS) out of range
24 -- Air Charge Temperature (ACT) sensor out of range
25 -- Knock sensor not sensed during Dynamic Response Test
26 -- Mass Air Flow (MAF) sensor out of range
29 -- No input from Vehicle Speed Sensor (VSS)
31 -- EGR Valve Position (EVP) sensor out of range (low)
32 -- EGR valve not seated; closed voltage low
33 -- EGR valve not opening; insufficient flow detected
34 -- EGR Valve Pressure Transducer/Position Sensor sonic voltage above closed limit
35 -- EGR Valve Pressure Transducer/Position Sensor voltage out of range (high)
41 -- Oxygen sensor circuit indicates system lean, right side
42 -- Oxygen sensor circuit indicates system rich, right side
44 -- Thermactor Air system inoperative, right side (5.0L only)
44 -- Exhaust Gas Temperature Switch failed or catalyst over temperature (3.8L SC only)
45 -- Coil Pack 1 (A) circuit failed (3.8L SC only)
45 -- Thermactor Air upstream during self-test (5.0L only)
46 -- Coil Pack 2 (B) circuit failed (3.8L SC only)
46 -- Thermactor Air not by-passed during self-test (5.0L only)
47 -- Spark location error (3.8L SC only)
48 -- Coil Pack 3 (C) circuit failed (3.8L SC only)
49 -- Default spark error (3.8L SC only)
51 -- Coolant Temperature Sensor (CTS) circuit open
52 -- Power Steering Pressure Switch circuit open
53 -- Throttle Position Sensor (TPS) out of range (high)
54 -- Air Charge Temperature (ACT) sensor circuit open
56 -- Mass Air Flow (MAF) sensor out of range (high)
61 -- Coolant Temperature Sensor (CTS) circuit grounded
63 -- Throttle Position Sensor (TPS) circuit out of range (low)
64 -- Air Charge Temperature (ACT) sensor circuit grounded
66 -- Mass Air Flow (MAF) sensor circuit out of range (low)
67 -- Clutch Switch circuit failed (3.8L SC only)
67 -- Neutral Drive Switch circuit open
72 -- Insufficient Mass Air Flow change during Dynamic Response Test
73 -- Insufficient Throttle Position output during Dynamic Response Test
74 -- Brake on/off switch failure
75 -- Brake on/off circuit failure
77 -- Wide Open Throttle (WOT) not sensed during self-test
79 -- A/C on during self-test
81 -- Air Management 2 circuit failure (5.0L only)
82 -- Air Management 1 circuit failure (5.0L only)
82 -- Supercharger By-pass Solenoid circuit failure (3.8L SC only
83 -- High Speed Electro Fan drive circuit failure (3.8L SC only)
84 -- EGR Vacuum Regulator (EVR) circuit failure
85 -- Canister Purge circuit failure
87 -- Primary Fuel Pump circuit failure
88 -- Electro Drive Fan circuit failure (3.8L SC only)
91 -- Oxygen sensor indicates system lean, left side
92 -- Oxygen sensor indicates system rich, left side
94 -- Thermactor Air system inoperative, left side (5.0L only)
95 -- Fuel Pump circuit open, ECA to motor
96 -- Fuel Pump circuit open, battery to ECA
98 -- Hard Fault present
111 -- System Pass
112 -- Air charge Temperature (ACT) sensor circuit below minimum voltage
113 -- Air Charge Temperature (ACT) sensor circuit above maximum voltage
114 -- Air Charge Temperature (ACT) sensor out of range
116 -- Coolant Temperature Sensor (CTS) out of range
117 -- Coolant Temperature Sensor (CTS) circuit below minimum voltage
118 -- Coolant Temperature Sensor (CTS) circuit above maximum voltage
121 -- Throttle Position Sensor (TPS) out of range
122 -- Throttle Position Sensor (TPS) below minimum voltage
123 -- Throttle Position Sensor (TPS) above maximum voltage
124 -- Throttle Position Sensor (TPS) voltage higher than expected
125 -- Throttle Position Sensor (TPS) voltage lower than expected
126 -- Manifold Absolute/Baro Pressure sensor out of range
129 -- Insufficient Manifold Absolute Pressure/Mass Air Flow change
136 -- Indicates lean condition, left side
137 -- Indicates rich condition, left side
139 -- No Oxygen sensor switching detected, left side
144 -- No Oxygen sensor switching detected, right side
157 -- Mass Air Flow (MAF) sensor below minimum voltage
158 -- Mass Air Flow (MAF) sensor above maximum voltage
159 -- Mass Air Flow (MAF) sensor out of range
167 -- Insufficient Throttle Position Sensor (TPS) change
171 -- Oxygen sensor unable to switch, right side
172 -- Oxygen sensor indicates lean condition, right side
173 -- Oxygen sensor indicates rich condition, right side
174 -- Oxygen sensor switching slow, right side
175 -- Oxygen sensor unable to switch, left side
176 -- Oxygen sensor indicates lean condition, left side
177 -- Oxygen sensor indicates rich condition, left side
178 -- Oxygen sensor switching slow, left side
179 -- Adaptive fuel lean limit reached at part throttle, system rich, right side
181 -- Adaptive fuel rich limit reached at part throttle, system lean, right side
182 -- Adaptive fuel lean limit reached at idle, system rich, right side
183 -- Adaptive fuel rich limit reached at idle, system lean, right side
184 -- Mass Air Flow higher than expected
185 -- Mass Air Flow lower than expected
186 -- Injector pulse-width higher than expected
187 -- Injector pulse-width lower than expected
188 -- Adaptive fuel lean limit reached at part throttle, system rich, left side
189 -- Adaptive fuel rich limit reached at part throttle, system lean, left side
191 -- Adaptive fuel lean limit reached at idle, system rich, left side
192 -- Adaptive fuel rich limit reached at idle, system lean, left side
211 -- Profile Ignition Pickup (PIP) circuit fault
212 -- Loss of TACH input to ECA; SPOUT circuit grounded
213 -- SPOUT circuit open
214 -- Distributorless Ignition System (DIS) cylinder identification circuit failure
215 -- Coil 1 primary circuit failure (DIS)
216 -- Coil 2 primary circuit failure (DIS)
217 -- Coil 3 primary circuit failure (DIS)
219 -- SPOUT circuit open; timing defaulted to 10 degrees
225 -- Knock not sensed during Dynamic Response Test
311 -- Thermactor Air system inoperative, right side
313 -- Thermactor Air not by-passed
314 -- Thermactor Air system inoperative, left side
326 -- EGR circuit voltage lower than expected
327 -- EGR Valve Pressure Transducer/Position sensor circuit below minimum voltage
328 -- EGR Valve Position sensor voltage below closed limit
332 -- EGR Valve opening not detected
334 -- EGR Valve Position sensor voltage above closed limit
335 -- EGR sensor voltage out of range
336 -- EGR circuit voltage higher than expected
337 -- EGR Valve Pressure Transducer/Position sensor circuit above maximum voltage
341 -- Octane Adjust Service pin in use
411 -- Unable to control RPM during low RPM self-test
412 -- Unable to control RPM during high RPM self-test
452 -- No input from Vehicle Speed Sensor (VSS)
511 -- Read Only Memory test failed
512 -- Keep Alive Memory test failed
513 -- Internal voltage failure in ECA
522 -- Neutral Drive Switch circuit open
525 -- Indicates vehicle in gear, A/C on
528 -- Clutch Switch circuit failure
536 -- Brake on/off switch circuit failure
538 -- Insufficient change in RPM
539 -- A/C on during self-test
542 -- Fuel pump circuit open; ECA to motor
543 -- Fuel pump circuit open; battery to ECA
552 -- Air Management 1 circuit failure
556 -- Primary fuel pump circuit failure
558 -- EGR Vacuum Regulator (EVR) circuit failure
563 -- High Speed Electro Drive Fan circuit failure
564 -- Electro Drive Fan relay circuit failure
565 -- Canister Purge circuit failure
998 -- Hard fault present
 
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