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Engine Controls - Tests W/Codes: Summary

If no hard fault codes are present (or only pass codes), driveability symptoms exist or intermittent codes exist, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.

NOTE: To determine a common cause for a code to be set, see CODE DIAGNOSTIC HINTS table.
CODE DIAGNOSTIC HINTS

Code Diagnostic Hints
11 Momentary Interruption Of Power Supply To ECU
12 No "G" or "NE" (RPM) Ignition Signal To ECU Within 2 Seconds After Engine Is Cranked
13 No "NE" (RPM) Ignition Signal To ECU When Engine Speed Is Greater Than Approximately 1000 RPM
14 No "IGF" Ignition Signal To ECU From Ignitor Several Times In Succession
16 Fault In Transmission/Transaxle ECU
21 Defective O2 Sensor, Open Or Short Circuit In O2 Sensor Signal
22 Open Or Short Circuit In Coolant Temp. Sensor Signal
24 Open Or Short Circuit In Intake Air Temp. Sensor Signal
25 Lean Signal Sent By O2 Sensor For Several Seconds
26 Rich Signal Sent By O2 Sensor For Several Seconds
27 Open Or Short Circuit In Sub-O2 Sensor Signal
28 Defective No. 2 O2 Sensor, Open Or Short Circuit In No. 2 O2 Sensor Signal
31 Open Or Short Circuit In Airflow Meter Or Vacuum Sensor Signal
32 Open Or Short Circuit Between Airflow Meter Terminals
34 Turbocharger Pressure Is Abnormal
35 Open Or Short Circuit In Turbocharger Pressure Sensor Or High Altitude Compensator Signal
41 Open Or Short Circuit In Throttle Position Sensor Signal
42 No "SPD" Signal From Vehicle Speed Sensor For Several Seconds With Engine Speed Approximately 2500-5500 RPM
43 No "STA" Signal To ECU Until Engine Reaches 800 RPM With Vehicle Not Moving
51 (1) Problem In One Of 3 Circuits Monitored By ECU
52 Open Or Short Circuit In Knock Sensor Signal
53 Knock Control In ECU Is Faulty
71 EGR Gas Below Predetermined Level During EGR Control
(1) The throttle position sensor, neutral safety switch and A/C Signal circuits are monitored.
CRESSIDA CODE IDENTIFICATION

Code No. System Affected Probable Cause
11 (1) ECU Power Supply Ignition Switch Or Ckt, Main Relay Or Ckt, ECU
12 & 13  RPM Signal Distributor Or Ckt, Starter Ckt, ECU
14  Ignition Signal Ignitor Or Ckt To ECU, ECU
16  Elect.-Controlled Transaxle Signal Transaxle ECU Or Ckt
21  O2 Sensor Signal O2 Sensor Or Ckt, ECU
22  Coolant Temp. Sensor Signal Coolant Temp. Sensor Or Ckt, ECU
24 (2) IAT Sensor Signal Intake Air Temp. Sensor Or Ckt, ECU
25  Lean Air/Fuel Mixture Loose Ground, Injector Or Ckt, O2 Sensor Or Ckt, Fuel Pressure, Ignition Sys, Coolant Temp. Sensor, Airflow Meter, ECU
26  Rich Air/Fuel Mixture Loose Ground, Injector Or Ckt, O2 Sensor Or Ckt, Fuel Pressure, Cold Start Injector Or Ckt, Coolant Temp. Sensor, Airflow Meter, Compression Pressure, ECU
27 (3) Sub-O2 Sensor Signal Sub-O2 Sensor Or Ckt, ECU
31 & 32  Airflow Meter Signal Airflow Meter Or Ckt, ECU
41 (2) TP Sensor Signal Throttle Position Sensor Or Ckt, ECU
42 (1) VSS Signal Vehicle Speed Sensor Or Ckt, ECU
43 (1) Starter Signal Starter Signal Ckt, Ignition Switch Or Ckt, Main Relay Or Ckt, ECU
51 (1) Switch Condition Signal A/C Switch Ckt, Neutral/Start Switch Or Ckt, TPS Or Ckt, ECU
52  Knock Sensor Signal Knock Sensor Or Ckt, ECU
53  Knock Sensor Ctrl (ECU) ECU
71 (3) EGR Sys Malfunction EGR Sys, EGR Temp. Sensor Or Ckt, EGR-VSV, ECU
(1) CHECK ENGINE light will not come on when code is set.
(2) CHECK ENGINE light comes on only for Calif. models.
(3) Used only on Calif. models.
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