Test Procedures
WARNING: This page is about a different variant/trim than selected.
- QB1 DTCS P0603 AND P1633: CHECK THE 12-VOLT BATTERY TERMINALSNOTE: If KAPWR is interrupted to the PCM because of a battery or PCM disconnect, a DTC can be generated on the first power-up.
- Inspect the 12-volt battery cables for loose connections and for corrosion.
Are the 12-volt battery terminal connections in good condition?
Yes No Key in OFF position.
GO to QB2 .REPAIR as necessary. - QB2 CHECK KAPWR TO THE PCM
- PCM connector disconnected.
- Measure the voltage between:
( + ) PCM Connector, Harness Side ( - ) Vehicle Battery KAPWR - Pin B45 Negative terminal Is the voltage less than 10.5 V?
Yes No REPAIR the open circuit. GO to QB3. - QB3 CHECK FOR A REPEAT OF THE DTC
- PCM connector connected.
- Clear all DTCs that may have been caused by the PCM disconnect.
- Test drive the vehicle and allow the engine to reach normal operating temperature.
- Check for self-test DTCs:
Are DTCs P0603 or P1633 present?
Yes No GO to QB4. Unable to duplicate or identify the fault at this time.
GO to Pinpoint Test Z . - QB4 INSPECT THE ENGINE COMPARTMENT FOR PROPER WIRE ROUTING
- Inspect the electronic engine control (EEC) system wiring for proper wire routing.
- Check the wiring routing to establish if any of the electrical connectors are being stressed due to poorly routed wiring. If necessary re-route and secure the wiring.
- Visually inspect wiring and connectors.
Are any concerns present?
Yes No REPAIR as necessary. INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .