Chart 6 Multiple PCM Codes

Multiple PCM Codes Chart:

PCM Sensor Circuit:

CIRCUIT DESCRIPTION
Some powertrain components share common feeds and returns and certain failures of these circuits will cause multiple codes to set. The chart in the accompanying image lists the groups of codes set by the failure of common feeds and/or returns. If all of the codes in a group are set, perform the diagnosis listed in that box. If all of the codes in a group are not set, diagnose the lowest code number first.

NOTES ON FAULT TREE
1. CKT 474 is the 5 volt feed from the Powertrain Control Module (PCM) to the Manifold Absolute Pressure (MAP) sensor, Throttle Position (TP) sensor, Exhaust Gas Recirculation (EGR) valve and Brake Booster Vacuum (BBV) sensor. An open or short to ground in CKT 474 between the PCM's pin "3E16" and S235 will cause Codes P022, P032, P036 and P103 to set.

2. CKT 452 is the sensor return to the PCM from the Intake Air Temperature (IAT) sensor and MAP sensor. An open in CKT 452 between S237 and S138 will cause Codes P031 and P038 to set.

3. CKT 452 is the sensor return to the PCM from the IAT sensor, MAP sensor, and transaxle temperature sensor. An open in CKT 452 between S237 and PCM's pin "2D1" will cause Codes P031, P038 and PO59 to set.

4. CKT 808 is the sensor return to the PCM from the EGR valve, Engine Coolant Temperature (ECT) sensor, BBV sensor and TP sensor. An open CKT 808 between S236 and PCM will cause Codes P015, P021, P036 and P102 to set.

5. CKT 741 is the battery feed from the engine compartment fuse block fuse "D1" to the transaxle shift "A/B" solenoids. An open in CKT 741 will cause Codes P029, P094, and P117 to set.

6. CKT 741 is the battery feed from the engine compartment fuse block fuse "D1" to the Torque Converter Clutch (TCC) brake switch which feeds the TCC through CKT 420. An open in CKT 741 or CKT 420, or an open in the TCC contacts of the TCC brake switch will cause Codes P039 and P090 to set.

7. CKT 741 is the battery feed for the Transaxle Shift "A/B" solenoids, TCC brake switch and TCC. A short to ground on CKT 741, an open fuse "D1" or an open feed to fuse "D1" will cause Codes P029, P039, P090, P094 and P117 to set.