On-Board Diagnostics With Scan Tool

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.

On-Board Diagnostics with Scan Tool

NOTE: For detailed instruction and other diagnostic methods using the scan tool, refer to the tester manual and the Powertrain Control/Emission Diagnosis (PC/ED).

These quick tests should be used to diagnose the Powertrain Control Module (PCM) and should be carried out in order.
^ Quick Test 1.0-Visual Inspection
^ Quick Test 2.0-Set Up
^ Quick Test 3.0-Key On, Engine Off
^ Quick Test 4.0-Continuous Memory
^ Quick Test 5.0-Key On, Engine Running
^ Special Test Mode
- Wiggle Test
- Output Test Mode
^ PCM Reset Mode
^ Clearing DTCs
^ OBD 11 Drive Cycle
^ Other NGS Features
^ Other diagnostic methods include the following.
- Parameter Identification (PID) Access Mode
- Freeze Frame Data Access Mode
- Oxygen Sensor Monitor Mode