DTC P0643: Sensor Reference Voltage A Circuit High Voltage Turn the ignition switch ON (II). Clear the DTC with the HDS. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0643 indicated?
YES | - | Go to Step 4 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the FRP sensor, the MAF/IAT sensor, the MAP/IAT sensor, the APP sensor and the ECM.■
Turn the ignition switch OFF, and wait 30 seconds. Disconnect ECM connectors No. 1 (96P) and No. 2 (58P). Turn the ignition switch ON (II). Measure voltage between body ground and ECM connector No. 1 terminals No. 8, No. 9, No. 33 and ECM connector No. 2 terminal No. 14 individually. Is there battery voltage?
YES | - | Repair short to power in the wire between the ECM connector terminals and these sensors, then go to Step 18 . FRP sensor and ECM connector No. 1 terminal No. 9 MAF/IAT sensor and ECM connector No. 1 terminal No. 8 MAP/IAT sensor and ECM connector No. 1 terminal No. 33 APP sensor and ECM connector No. 2 terminal No. 14
NO | - | Go to Step 8 .
Turn the ignition switch OFF. Disconnect the connectors from these sensors: FRP sensor MAF/IAT sensor MAP/IAT sensor APP sensor |