Diagnostic Step-by-Step
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 in order to reduce the likelihood of damage to electrical components.
* Disconnecting the EAS connectors during the troubleshooting process will result in multiple errors.
* For specific electrical component information and pinout locations, always refer to the technical data.
* It is necessary to exit the fault code menu 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 fault codes. Refer to the ‘possible causes’ section.
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
