Please perform the troubleshooting steps below using the breakout harness, if necessary, to check electrical components, such as sensors, electrical control units, and harnesses. Back probing is not recommended, as it could damage the harness. The ignition should always be in the OFF position when connecting or disconnecting electrical components to reduce the likelihood of damage to electrical components.
* This troubleshooting tree is based on the assumption that supply power and ground to the PCI are functioning properly.
* Disconnecting the PCI connectors during the troubleshooting process will result in multiple errors.
* For specific electrical component information and pin out locations, always refer to the technical data in Rapido.
* It is necessary to exit the ‘active errors’ screen in DAVIE and run the diagnostic test again to identify a change in errors.
* Remember that the truck’s operational or mechanical issues may be the root cause of both active and inactive codes. Refer to the ‘possible causes’ section in Rapido.
Verification Drive Cycle
To validate the repair, with the brakes set, turn the key to the ON position with the engine off, and allow 10 seconds for the system to initialize and run diagnostics.
