Carry Out on-Board Diagnostics (KOEO, KOER)

Carry out On-Board Diagnostics

NOTE: If equipped, turn the Power Take-Off (PTO) unit off to ensure correct test results. For a description of PTO operation, refer to Transmission Electronic Control System. Transmission Electronic Control System On-Board Diagnostic is not accessible when the PTO is in operation.

After a road test, with the vehicle warm and before disconnecting any connectors, carry out the Quick Test using the scan tool. Refer to the Computers and Control Systems for diagnosis and testing of the powertrain control system.