Test VER-6A: LDP Dealer Test Mode

Inspect vehicle to ensure all engine components are connected. The LDP Dealer Test mode has been added to scan tool to verify repairs to the LDP system. A scan tool software program was written which causes PCM to run the LDP monitor as part of this test. Test failures will be indicated through a stored DTC. Dealer Test Mode is a useful way to run a total system performance test. Use this test to verify a LDP system repair.

The software program makes temporary changes to the operating mode of the PCM. For this reason, it is critical that the test not be interrupted. PCMs left in this mode as a result of an interrupted test will illuminate the MIL for 8-10 minutes of driving with no DTCs stored. Erasing DTCs will not change this condition.

If a vehicle is found to be stuck in the mode described, LDP Dealer Test should be rerun in its entirety so the software program in scan tool can restore the PCM to operating mode. Note the similarity to LDP MONITOR screen found under OBD II MONITORS. Failure modes are fewer in this system test than in OBD II LDP monitor. The system test will only store the SMALL LEAK DTC to indicate a problem with the system. No other type of failure mode indication is given. The system test failure may have been, for example, due to a large leak, but PCM will set SMALL LEAK DTC to indicate failures that occurred as part of system test.

Connect scan tool to DLC. Turn off all accessories. With scan tool in LDP Dealer Test mode, follow prompts on screen. Repair is complete.