Z40

The Intermittent Road Test Procedure is a set of instructions for monitoring the PIDs and/or components with a Scan tool during a road test. This is done under four different conditions KOEO, HOT IDLE, 30 mph and 55 mph.

The Diagnostic Reference Value Charts should be used to compare the data from the vehicle to typical data on the charts. Normal Scan Data Values - Includes Pids

For 30 and 55 mph procedures, a passenger is required and a route is also recommended. To perform an On-Board Diagnostics II (OBD II) Drive Cycle, refer to Drive Cycles to help plan a route. Monitors, Trips, Drive Cycles and Readiness Codes

- Copy the list of PIDs in the order given by the Intermittent Symptom Charts. Intermittent Symptom Charts

These PIDs will be monitored during the Road Test Procedure. If sent from a Pinpoint Test, recommended PIDs should also be sent.

- Key Off.

- Connect Scan Tool to DLC.

- Connect other diagnostic aids if available to help find fault (i.e. fuel PSI gauge, vacuum gauge or Intermittent Ignition Analyzer).

- Key On, Engine Off.

- Access the PIDs based on the information from the pinpoint test or Intermittent Symptom Charts. Intermittent Symptom Charts

- Compare the actual values from the vehicle to the KOEO values from the Diagnostic Reference Value Chart. Normal Scan Data Values - Includes Pids

- Are any values out of range?

Yes -- Fault identified. For Input fault: GO to Z10. Z10

For output fault: GO to to Z20. Z20

No -- Unable to verify fault. GO to Z41. Z41