Category: OBDii Powertrain Codes

P1294 Mitsubishi Idle Air Control Motor Circuit Possible causes – Faulty Intake Air Control (IAC) Valve– Intake Air Control (IAC) Valve harness is open or shorted– Intake Air Control (IAC) Valve circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1295 Electronic Throttle Control System Malfunction Power Management Possible causes – Faulty Throttle Position Sensor (TPS)– Throttle Position Sensor (TPS) harness is open or shorted– Throttle Position Sensor (TPS) circuit poor electrical connection– Faulty Powertrain Control Module (PCM)– Faulty Mass Air Flow (MAF) sensor– Faulty Manifold Absolute Pressure (MAP) sensor Symptoms – Engine Light ON…

P1287 Fuel Injection Pump Controller Supply Voltage Low Condition Possible causes – Fuel injection pump ground circuit open– Battery defective Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1288 Air Fuel Ratio Sensor 1 Circuit Slow Response Bank 2 Possible causes – Air fuel ratio (A/F) Harness or connectors is open or shorted– Air fuel ratio (A/F) sensor 1 Bank 2– Air fuel ratio (A/F) sensor 1 heater Bank 2– Fuel pressure– Fuel injector– Intake air leaks– Exhaust Gas leaks– PVC– Air Flow…

P1289 Air Fuel Ratio Sensor 1 Circuit Slow Response Bank 2 Possible causes – Air fuel ratio (A/F) Harness or connectors is open or shorted– Air fuel ratio (A/F) sensor 1 Bank 2– Air fuel ratio (A/F) sensor 1 heater Bank 2– Fuel pressure– Fuel injector– Intake air leaks– Exhaust Gas leaks– PVC– Air Flow…

P1290 Cylinder Head Temperature Sensor Signal Less Than Self-Test Range Possible causes Grounded circuit in CHT harness. Damaged CHT sensor. Improper harness connection. Damaged PCM. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1290 Description Indicates a CHT sensor circuit malfunction (shorted).

P1291 Injector High Side Short To GND Or VBATT – Bank 1

P1292 Injector High Side Short To GND Or VBATT – Bank 2

P1293 Intake Manif Short Runner Solenoid Circ or

P1281 Air Fuel Ratio Sensor 1 Circuit No Activity Detected Bank 2 Possible causes – Faulty air fuel ratio (A/F) sensor 1 heater Bank 2 – Air fuel ratio (A/F) harness is open or shorted– Air fuel ratio (A/F) circuit poor electrical connection What about the obd code? The A/F signal computed by ECM from…

P1282 Air Fuel Ratio Sensor 1 Circuit No Activity Detected Bank 2 Possible causes – Faulty air fuel ratio (A/F) sensor 1 heater Bank 2 – Air fuel ratio (A/F) harness is open or shorted– Air fuel ratio (A/F) circuit poor electrical connection What about the obd code? The A/F signal computed by ECM from…

P1283 Air Fuel Ratio Sensor 1 Lean Shift Monitoring Bank 2 Possible causes – Faulty Air fuel ratio (A/F) sensor 1 Bank 2 – Faulty Air fuel ratio (A/F) sensor 1 heater Bank 2 – Fuel pressure– Faulty Fuel injector – Intake air leaks– Faulty Air Flow Meter Tech description If one or more sensors…

P1284 Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2 Possible causes – Faulty Air fuel ratio (A/F) sensor 1 Bank 1 – Faulty Air fuel ratio (A/F) sensor 1 heater Bank 1 – Fuel pressure– Faulty Fuel injector – Faulty Air Flow Meter Tech description What about the obd code? The A/F signal…

P1285 Cylinder head over temp sensed Possible causes Low engine coolant level. Base engine concerns. Engine cooling system concerns. CHT sensor concern. Tech description On some applications when this fault occurs the Engine Temperature warning indicator will illuminate and/or force the temperature gauge to the full H (hot) zone. The warning indicator can be triggered…

P1286 Air Fuel Ratio Sensor 1 Circuit High Voltage Detected Bank 2 Possible causes – Faulty air fuel ratio (A/F) sensor 1 heater Bank 2 – Air fuel ratio (A/F) harness is open or shorted– Air fuel ratio (A/F) circuit poor electrical connection What about the obd code? The A/F signal computed by ECM from…

P1280 Accelerator Pedal Position (APP) Sensor 2 Circuit Technical Service Bulletins for P1280 code

P1274 Cylinder #4 High To Low Side Open Possible causes Air fuel ratio (A/F) sensor 1 Air fuel ratio (A/F) sensor 1 heater Fuel pressure Fuel injector What about the obd code? The output voltage computed by ECM from the A/F sensor 1 (Bank 1) signal is shifted to the rich side for a specified…

P1275 Cylinder #5 High To Low Side Open Possible causes Fuel injector No. 5 output circuit short to voltage. Injector. NG Module. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1275 Description Indicates a high voltage condition exists at the injector output of the NG module for cylinder No. 5 when low…

P1276 Cylinder #6 High To Low Side Open Possible causes Harness or connectors (The A/F sensor 1 circuit is open or shorted.) Air fuel ratio (A/F) sensor 1 What about the obd code? The A/F signal computed by ECM from the A/F sensor 1 (Bank 1) signal is constantly approx. 1.5V. Symptoms – Engine Light…

P1277 Cylinder #7 High To Low Side Open Possible causes Fuel injector No. 7 output circuit short to voltage. Injector. NG Module. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1277 Description Indicates a high voltage condition exists at the injector output of the NG module for cylinder No. 7 when low…