Powertrain Chart 6, Multiple Pcm Codes
Some powertrain components share common feeds and returns. Certain failures of these circuits will cause multiple codes to set. Flow chart indicates groups of codes set by failure of common feeds and/or returns. If all codes in a group are set, perform diagnosis listed in that box. If all codes in a group are not set, diagnose lowest code number first.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Circuit No. 474 is 5-volt feed from PCM to MAP and TP sensor. An open or short to ground in circuit No. 474 between PCM terminal 1C14 and circuit S215 will cause Codes P022 and P032 to set.
- Circuit No. 452 is sensor return to PCM from IAT and MAP sensors. An open in circuit No. 452 between PCM terminal 2A5 will cause Codes P031 and P038 to set.
- Circuit No. 808 is sensor return to PCM from ECT sensor, TP sensor and transaxle temperature sensor. An open in circuit No. 808 between circuit S217 and PCM will cause Codes P015, P021 and P059 to set.
- Circuit No. 741 is battery feed from fuse D1 (engine compartment fuse block) to EGR solenoid, power steering pressure switch and transaxle TCC solenoid. An open or short to ground in circuit No. 741 between fuse D1 and splice connector will cause Codes P039, P040 and P048 to set.