DIAGNOSTICS AIDS
Note. If an intermittent problem is evident, follow guidelines below.
Diagnostic Trouble Code Tables
Do not use Diagnostic Trouble Code (DTC) tables to try to correct an intermittent fault. The fault must be present to locate problem. Incorrect use of DTC tables may result in unnecessary replacement of parts.
Road Test
If a visual inspection does not find cause of problem, vehicle can be driven with a voltmeter or a scan tool connected to a suspected circuit. An abnormal voltage or scan tool reading will indicate that problem is in that circuit.
If there are no wiring or connector problems found and a DTC was stored for a circuit having a sensor, except for DTC P0171 and DTC P0172, replace sensor.
CLEARING TROUBLE CODES
Note. To prevent PCM/ECM damage, key must be OFF when disconnecting or reconnecting power to PCM/ECM (for example battery cable, PCM/ECM pigtail connector, PCM/ECM fuse, jumper cables, etc.).
When PCM/ECM sets a diagnostic trouble code (DTC), Malfunction Indicator Lamp (MIL) will be turned on only for type A and B, and a DTC will be stored in PCM/ECM's memory.
The MIL operates differently on OBD II compliant vehicles. OBD II guidelines require that MIL (CHECK ENGINE or SERVICE ENGINE SOON) illuminate only for DTCs that will impact vehicle emissions (type A and B). The Diagnostic Executive will turn on MIL if test fails or emissions exceed FTP by 1-1/2 times.
If vehicle is experiencing a misfire malfunction that may cause damage to Three-Way Catalytic Converter (TWC), MIL will flash once per-second. Flashing of MIL will continue until vehicle is out of engine speed and load conditions that could cause possible catalyst damage. The MIL will remain illuminated after flashing stops.
When MIL is on, Diagnostic Executive will turn off MIL after three consecutive trips in which a "test passed" has been reported for diagnostic test that originally caused MIL to illuminate. For fuel trim or misfire DTCs, tests must also pass during same operating conditions that DTC is set under (within 375 rpm, within 10% of engine load) and similar engine temperature when DTC set.
DTCs should be cleared after repairs have been completed. Some diagnostic tables will tell you to clear codes before using chart. This allows PCM/ECM to set DTC while going through chart, which will help to find cause of problem more quickly.
DIAGNOSTIC TROUBLE CODES
| DTC | Description |
|---|---|
| DTC P0106 | MANIFOLD ABSOLUTE PRESSURE RATIONALITY |
| DTC P0107 | MANIFOLD ABSOLUTE PRESSURE LOW VOLTAGE |
| DTC P0108 | MANIFOLD ABSOLUTE PRESSURE HIGH VOLTAGE |
| DTC P0112 | INTAKE AIR TEMPERATURE LOW VOLTAGE |
| DTC P0113 | INTAKE AIR TEMPERATURE HIGH VOLTAGE |
| DTC P0117 | ENGINE COOLANT TEMPERATURE LOW VOLTAGE |
| DTC P0118 | ENGINE COOLANT TEMPERATURE HIGH VOLTAGE |
| DTC P0121 | THROTTLE POSITION SENSOR RATIONALITY |
| DTC P0122 | THROTTLE POSITION SENSOR LOW VOLTAGE |
| DTC P0123 | THROTTLE POSITION SENSOR HIGH VOLTAGE |
| DTC P0125 | ENGINE COOLANT TEMPERATURE INSUFFICIENT FOR CLOSED LOOP FUEL CONTROL |
| DTC P0128 | STUCK OPEN THERMOSTAT |
| DTC P0131 | O2 BANK 1 SENSOR 1 LOW VOLTAGE |
| DTC P0132 | O2 BANK 1 SENSOR 1 HIGH VOLTAGE |
| DTC P0133 | O2 BANK 1 SENSOR 1 SLOW RESPONSE |
| DTC P0134 | O2 BANK 1 SENSOR 1 NO ACTIVITY |
| DTC P0137 | O2 BANK 1 SENSOR 2 LOW VOLTAGE |
| DTC P0138 | O2 BANK 1 SENSOR 2 HIGH VOLTAGE |
| DTC P0140 | O2 BANK 1 SENSOR 2 NO ACTIVITY |
| DTC P0141 | O2 BANK 1 SENSOR 2 HEATER |
| DTC P0171 | BANK 1 SYSTEM TOO LEAN |
| DTC P0172 | BANK 1 SYSTEM TOO RICH |
| DTC P0201 | INJECTOR 1 CIRCUIT FAULT |
| DTC P0202 | INJECTOR 2 CIRCUIT FAULT |
| DTC P0203 | INJECTOR 3 CIRCUIT FAULT |
| DTC P0204 | INJECTOR 4 CIRCUIT FAULT |
| DTC P0300 | MULTIPLE CYLINDER MISFIRE DETECTED |
| DTC P0301 | CYLINDER 1 MISFIRE |
| DTC P0302 | CYLINDER 2 MISFIRE |
| DTC P0303 | CYLINDER 3 MISFIRE |
| DTC P0304 | CYLINDER 4 MISFIRE |
| DTC P0325 | KNOCK SENSOR DSNEF INTERNAL MALFUNCTION |
| DTC P0327 | KNOCK SENSOR CIRCUIT FAULT |
| DTC P0336 | 58X CRANK POSITION EXTRA/MISSING PULSES |
| DTC P0337 | 58X CRANK POSITION NO SIGNAL |
| DTC P0341 | CAM RATIONALITY |
| DTC P0342 | CAM POSITION NO SIGNAL |
| DTC P0351 | IGNITION CONTROL A CIRCUIT FAULT |
| DTC P0352 | IGNITION CONTROL B CIRCUIT FAULT |
| DTC P0401 | EXHAUST GAS RECIRCULATION INSUFFICIENT FLOW |
| DTC P0402 | EXHAUST GAS RECIRCULATION EXCESSIVE FLOW |
| DTC P0404 | EXHAUST GAS RECIRCULATION OPEN VALVE POSITION ERROR |
| DTC P0405 | EXHAUST GAS RECIRCULATION PINTLE POSITION LOW VOLTAGE |
| DTC P0406 | EXHAUST GAS RECIRCULATION PINTLE POSITION HIGH VOLTAGE |
| DTC P0420 | CATALYST BANK 1 LOW EFFICIENCY |
| DTC P0440 | EVAPORATIVE EMISSION SYSTEM LARGE LEAK/LOW TANK VACUUM |
| DTC P0442 | EVAPORATIVE EMISSION SYSTEM SMALL LEAK |
| DTC P0446 | EVAPORATIVE EMISSION SYSTEM VENT CONTROL MALFUNCTION |
| DTC P0449 | EVAPORATIVE EMISSION SYSTEM VENT SOLENOID CIRCUIT FAULT |
| DTC P0452 | FUEL TANK PRESSURE SENSOR LOW VOLTAGE |
| DTC P0453 | FUEL TANK PRESSURE SENSOR HIGH VOLTAGE |
| DTC P0461 | FUEL LEVEL STUCK |
| DTC P0462 | FUEL LEVEL LOW VOLTAGE |
| DTC P0463 | FUEL LEVEL HIGH VOLTAGE |
| DTC P0464 | FUEL LEVEL RATIONALITY |
| DTC P0480 | COOLING FAN RELAY A FAN CONTROL CIRCUIT FAULT (WITH A/C) |
| DTC P0481 | COOLING FAN RELAY B FAN CONTROL CIRCUIT FAULT (WITH A/C) |
| DTC P0502 | VEHICLE SPEED (ENGINE SIDE) NO SIGNAL |
| DTC P0506 | IDLE SPEED RPM LOWER THAN DESIRED IDLE SPEED |
| DTC P0507 | IDLE SPEED RPM HIGHER THAN DESIRED IDLE SPEED |
| DTC P0562 | SYSTEM VOLTAGE (ENGINE SIDE) TOO LOW |
| DTC P0563 | SYSTEM VOLTAGE (ENGINE SIDE) TOO HIGH |
| DTC P0601 | PCM/ECM (ENGINE SIDE) CHECKSUM FAULT |
| DTC P1106 | MANIFOLD ABSOLUTE PRESSURE INTERMITTENT HIGH VOLTAGE |
| DTC P1107 | MANIFOLD ABSOLUTE PRESSURE INTERMITTENT LOW VOLTAGE |
| DTC P1111 | INTAKE AIR TEMPERATURE INTERMITTENT HIGH VOLTAGE |
| DTC P1112 | INTAKE AIR TEMPERATURE INTERMITTENT LOW VOLTAGE |
| DTC P1114 | ENGINE COOLANT TEMPERATURE INTERMITTENT LOW VOLTAGE |
| DTC P1115 | ENGINE COOLANT TEMPERATURE INTERMITTENT HIGH VOLTAGE |
| DTC P1121 | THROTTLE POSITION SENSOR INTERMITTENT HIGH VOLTAGE |
| DTC P1122 | THROTTLE POSITION SENSOR INTERMITTENT LOW VOLTAGE |
| DTC P1130 | O2 BANK 1 SENSOR 1 LOW SIGNAL VARIANCE |
| DTC P1133 | O2 BANK 1 SENSOR 1 TOO FEW TRANSITIONS |
| DTC P1134 | O2 BANK 1 SENSOR 1 TRANSITION RATIO |
| DTC P1171 | FUEL SUPPLY SYSTEM LEAN DURING POWER ENRICH |
| DTC P1336 | 58X CRANK POSITION TOOTH ERROR NOT LEARNED |
| DTC P1380 | ABS ROUGH ROAD DATA INVALID |
| DTC P1381 | ABS ROUGH ROAD SERIAL DATA FAULT |
| DTC P1391 | G SENSOR ROUGH ROAD RATIONALITY |
| DTC P1392 | G SENSOR ROUGH ROAD LOW VOLTAGE |
| DTC P1393 | G SENSOR ROUGH ROAD HIGH VOLTAGE |
| DTC P1404 | EXHAUST GAS RECIRCULATION CLOSED VALVE PINTLE ERROR |
| DTC P1441 | EVAPORATIVE EMISSION CONTINUOUS PURGE FLOW |
| DTC P1546 | A/C CLUTCH OUTPUT CIRCUIT FAULT |
| DTC P1618 | PCM/ECM INTERNAL SPI COMMUNICATION |
| DTC P1627 | PCM/ECM A/D CONVERSION ERROR |
| DTC P1635 | PCM/ECM 5 VOLT REFERENCE LINE LOW |
| DTC P1640 | ODM INTERNAL SPI COMMUNICATION |
DTC INDEX
