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 sensor, TP sensor, EGR valve and BBV sensor. An open or short to ground in circuit No. 474 between PCM terminal 3E16 and circuit S235 will cause Codes P022, P032, P036 and P103 to set.
- Circuit No. 452 is sensor return to PCM from IAT and MAP sensors. An open in circuit No. 452 between circuits S237 and S138 will cause Codes P031 and P038 to set.
- Circuit No. 452 is sensor return to PCM from IAT sensor, MAP sensor and transaxle temperature sensor. An open in circuit No. 452 between circuit S237 and PCM terminal 2D1 will cause Codes P031, P038 and P059 to set.
- Circuit No. 808 is sensor return to PCM from EGR valve, ECT sensor, BBV sensor and TP sensor. An open in circuit No. 808 and S236 and PCM will cause Codes P015, P021, P036 and P102 to set.
- Circuit No. 741 is battery feed from fuse D1 (engine compartment fuse block) to transaxle solenoids "A" and "B". An open in circuit No. 741 will cause Codes P029, P094 and P117 to set.
- Circuit No. 741 is battery feed from fuse D1 (engine compartment fuse block) to TCC brake switch which feeds the TCC through circuit No. 420. An open in circuits No. 741 and 420 or an open in TCC contacts of TCC brake switch will cause Codes P039 and P090 to set.
- Circuit No. 741 is battery feed for transaxle shift solenoids "A" and "B", TCC brake switch and TCC. A short to ground on circuit No. 741, an open fuse D1 or an open feed to fuse D1 will cause Codes P029, P039, P090, P094 and P117 to set.