Chart 6 Multiple PCM Codes

Chart 6:

Sensor Wiring Circuits:

CIRCUIT DESCRIPTION:
Some powertrain components share common feeds and returns and certain failures of these circuits will cause multiple codes to set. The chart on the facing page 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 PCM to the MAP sensor and TP sensor. An open or short to ground in CKT 474 between the PCM's pin '1C14' and S215 will cause Codes P022 and P032 to set.

2. CKT 476 is the sensor return to the PCM from the IAT sensor and MAP sensor. An open in CKT 476 between 5216 and PCM pin '2A5' will cause Codes P031 and P038 to set.

3. CKT 1076 is the sensor return to the PCM from the ECT sensor and TP sensor. An open CKT 476 between S217 and PCM will cause Codes P015 and P021.

4. CKT 750 is the battery feed from the engine compartment fuse block fuse 'D1' to the TCC brake switch which feeds the torque converter clutch through CKT 420. An open in CKT 750 or CKT 420 or an open in the TCC brake switch will cause Codes P039 and P090 to set.