Driving Patterns For Repair Validation Chart

Driving Patterns For Repair Validation Chart:

TABLE FOOTNOTES
1. See "OBD II Drive Cycles" for description of Drive Cycles. Monitors, Trips, Drive Cycles and Readiness Codes
2. When performing multiple Drive Cycles, Mode 1 only has to be completed once. Then, Modes 2 and 3 can be performed multiple times without concern.
3. Be sure to check Readiness Function Codes (RFCs). If no RFCs clear, it is possible that Mode 1 did not complete. If Mode 1 cannot be completed, go to Pinpoint Test QC. QC - OBD II Monitor Testing Not Complete (DTC P1000)
4. When performing multiple Drive Cycles, Mode 1 only has to be completed once. Then, Modes 2 and 3 can be performed multiple times without concern.
5. Mode 3 only should be performed if no RFCs are cleared by Mode 2. If Mode 3 also does not clear any RFCs, reattempt pattern. If no RFCs will clear, a Mode 1 failure is likely. Go to Pinpoint Test QC. QC - OBD II Monitor Testing Not Complete (DTC P1000)
6. Mode 2 only should be performed if no RFCs are cleared by Mode 3. If Mode 2 also does not clear any RFCs, reattempt pattern. if no RFCs will clear, a Mode 1 failure is likely. Go to Pinpoint Test QC. QC - OBD II Monitor Testing Not Complete (DTC P1000)

NOTE: Refer to Drive Cycles, for detailed information on how to perform Modes 1, 2 and 3 of the Drive Cycle. Monitors, Trips, Drive Cycles and Readiness Codes
- Mode 1 is used by the Powertrain Control Module (PCM) to learn air/fuel ratios. Mode 1 Procedure
- Mode 2 is used to monitor the EGR and fuel systems. Mode 2 Procedure
- Mode 3 is used to monitor the catalyst efficiency and oxygen sensors. Mode 3 Procedure

NOTE: Be sure to check the New Generation STAR (NGS) software for the availability of an active MODE__1 PID. If available, monitor the MODE__1 PID while performing Mode 1. If Mode 1 is not completed, Modes 2 and 3 can not be completed, and the vehicle systems to be tested will not be monitored. Also, if Mode 1 will not complete using the procedure as described, it may indicate another vehicle concern that must be addressed prior to completing Mode 1.

- When driving to validate a repair, different driving patterns need to be performed depending on the repair to be validated. These patterns will activate diagnostic monitors within the PCM which ensure the vehicle systems being monitored are operating properly. Once a system has been determined to be operating properly, a Readiness Function Code (RFC) will be completed, which can be viewed using the NGS Tester Generic OBD II function.

- To activate the diagnostic monitors, specific modes of the Drive Cycle must be completed. Mode 1 will only be performed once, but Modes 2 and/or 3 will have to be performed twice, depending on the system to be monitored.

- After Modes 2 and 3 are completed, RFCs can be checked to see if the monitored system is working properly. If the RFCs for Mode 2 or 3 do not complete, the other mode should be performed. If no RFCs will complete, it is probable that Mode 1 was not performed properly (check MODE__I PID if available).

- Perform Mode 1 again if it is probable that Mode 1 was not properly performed. If Mode 1 can not be completed, go to Pinpoint Test QC. QC - OBD II Monitor Testing Not Complete (DTC P1000)

- If Mode 2 and 3 are performed and only some RFCs complete, then there is most likely a concern with the system which will not complete the RFCs. Perform the mode (2 or 3) that did not clear any monitors.

- Once all the modes in the recommended driving pattern are complete, return to Diagnostic Quick Test to retrieve DTCs and validate that the vehicle repair is complete. Reading Diagnostic Trouble Codes