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Ford Diagnostic Codes, Trouble Codes and Descriptions

WesTech Auto

Diagnostic Codes

Ford

Electronic Engine Control IV (EEC-IV)
Engine Running Codes
11 System Pass.
12 Engine speed not within self test Upper Limit.
13 Engine speed not within self test Lower Limit.
13 Idle Speed Control Motor did not move.
16 Idle RPM High with ISC Retracted (2.5L).
16 RPM above self test Limit with ISC Off (1986-90 1.9L EFI).
16 RPM too Low to Perform Heated Oxygen Sensor Test (other vehicles).
17 Idle RPM Low with ISC Retracted (1.9L & 2.5L CFI).
17 RPM below self test Limit with ISC Off (1986-90 1.9L EFI).
18 Spark out (SPOUT) circuit open.
18 Spark Angle Word (SAW) circuit failure (1.9L SFI).
19 failure in PCM Internal voltage.
19 Erratic RPM during Hard Idle self test.
19 RPM Drop too Low during ISC Off Test (1.9L EFI).
21 Engine Coolant Temperature (ECT) Sensor out of self test Range.
22 Manifold Absolute Pressure/Barometric Pressure Sensor out of self test Range.
23 Throttle Position Sensor out of self test Range.
23 Fuel Injector Pump Lever Sensor Input is out of self test Range (Diesel).
24 Intake Air Temperature/Air Charge Temperature Sensor is out of self test Range.
25 Knock not Sensed during Dynamic Response Test.
26 Mass Air Flow/Vane Air Flow Sensor out of self test Range.
26 Transmission Fluid Temperature Sensor Input out of self test Range (5.0L, 5.8L, 7.3L & 7.5L Truck).
28 Vane Air Temperature Sensor Input out of self test Range (1.9L EFI).
31 EGR Valve Position/Pressure Feedback EGR circuit below minimum voltage.
32 EGR not Controlling (2.3L OHC & 3.8L CFI).
32 EGR Valve not Seated (1.9L CFI, 2.9L & 3.0L SHO).
32 EGR Valve Position/Pressure Feedback EGR voltage below closed voltage (other vehicles).
33 EGR not Closing Properly (2.3L OHC & 3.8L CFI).
33 EGR Valve opening not detected (other vehicles).
34 EGR Valve opening not detected (2.3L OHC & 3.8L CFI).
34 Defective EGR Pressure Transducer Sensor (1.9L CFI, 2.3L HSC EFI & 3.0L).
34 EGR on/Off Control (2.3L Turbo).
34 EGR Valve Position/Pressure Feedback EGR voltage above closed Limit (other vehicles).
35 RPM too Low to Perform EGR Test (2.3L OHC & 3.8L CFI).
35 EGR Valve Position/EGR Pressure Feedback. EGR circuit above maximum voltage (other vehicles).
36 System Indicates Lean at Idle.
37 System Indicates Rich at Idle.
41 System Indicates Lean.
42 System Indicates Rich.
44 Secondary Air System Inoperative.
45 Secondary Air Upstream during self test.
46 Secondary Air not Bypassed during self test.
47 Measured Air Flow Low at Base Idle.
48 Measured Air Flow High at Base Idle (1986-90 1.9L EFI).
52 Power Steering Pressure Switch circuit did not change states.
54 Intake Air Temperature/Air Charge Temperature circuit open.
55 Key Power Check.
56 Mass Air Flow/Vane Air Flow Sensor circuit above maximum voltage.
58 Idle Tracking Switch circuit open or grounded (CFI).
61 Engine Coolant Temperature Sensor circuit grounded.
63 Throttle Position Sensor circuit below minimum voltage.
64 Intake Air Temperature/Air Charge Temperature circuit grounded.
65 Transmission Control Switch/Overdrive Cancel Switch circuit did not change states.
68 Idle Tracking Switch closed (1.9L, 2.3L, 2.5L & 3.8L CFI).
72 Insufficient Manifold Absolute Pressure/Mass Air Flow change during Dynamic Response Test.
73 Insufficient Throttle Position change during Dynamic Response Test.
74 Brake on/Off circuit did not change during self test.
75 Brake on/Off circuit closed/ECA Input open.
76 Insufficient Vane Air Flow Sensor Output change during Dynamic Response Test.
77 Operator Error - Dynamic Response Test.
78 Re-Initialization Check.
91 Heated Oxygen Sensor circuit Indicates Lean.
92 Heated Oxygen Sensor circuit Indicates Rich.
94 Secondary Air Injection Inoperative.
98 Hard Fault Present.
99 Electronic Engine System has not learned to Control Idle.
111 System Pass.
114 Intake Air Temperature/Air Charge Temperature Higher or Lower than Expected.
116 Engine Coolant Temperature Higher or Lower than Expected.
121 Closed Throttle voltage Higher or Lower than Expected.
121 Indicates Throttle Position voltage Inconsistent with Mass Air Flow Sensor.
126 Manifold Absolute Pressure/Barometric Pressure Sensor Higher or Lower than Expected.
129 Insufficient Manifold Absolute Pressure/Mass Air Flow change during Dynamic Response Test.
136 System Indicates Lean (Bank No. 1).
137 System Indicates Rich (Bank No. 2).
138 Cold Start Injector Flow insufficient.
141 Flexible Fuel Control.
159 Mass Air Flow Higher or Lower than Expected.
167 Insufficient Throttle Position change during Dynamic Response Test.
172 Heated Oxygen Sensor System Indicates Lean.
173 Heated Oxygen Sensor System Indicates Rich.
176 Insufficient Throttle Position change during Dynamic Response Test (4.9L).
213 Spark Output (SPOUT) circuit open.
225 Knock not Sensed during Dynamic Response Test.
244 Cylinder Identification Sensor circuit failure (2.0L).
311 AIR System Inoperative/AIR System Inoperative (Bank No. 1 with Dual Heated Oxygen Sensor).
312 AIR Misdirected.
313 AIR not Bypassed.
314 AIR System Inoperative.
326 Pressure Feedback EGR circuit voltage Low (other vehicles).
327 EGR circuit below minimum voltage.
328 EGR Valve Position Sensor closed Valve voltage Lower than Expected.
332 Insufficient EGR Flow detected.
334 EGR Valve Position Sensor closed Valve voltage Higher than Expected.
336 Pressure Feedback EGR circuit voltage Higher than Expected.
337 EGR Valve Position/Pressure Feedback EGR circuit above maximum voltage.
411 Cannot Control RPM - Low RPM Check.
412 Cannot Control RPM - High RPM Check.
511 Read out Memory Test failure.
513 PCM Internal voltage failure.
521 Power Steering Pressure Switch circuit did not change states.
536 Brake on/off circuit failure/not actuated.
538 Insufficient RPM change during Dynamic Response Test.
538 Invalid Cylinder Balance Test Due to Throttle Movement during Test.
538 Invalid Cylinder Balance Test Due to Cylinder Identification Sensor circuit failure.
539 A/C or Defrost on.
625 Hard Fault is Present (5.8L).
636 Transmission Fluid Temperature higher or lower than expected.
639 Insufficient Input from Turbine Speed Sensor.
653 Torque Converter Solenoid did not change states.
659 High Vehicle Speed in Park Indicated.
675 Transmission Range Sensor circuit voltage out of range.
998 Hard Fault Present.
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