NOTE: For component location, see COMPONENT LOCATIONS . For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see appropriate WIRING DIAGRAMS article.

If the Powertrain Control Module (PCM) has been replaced and the correct vehicle mileage and Vehicle Identification Number (VIN) have not been programmed, a Diagnostic Trouble Code (DTC) will be set in Controller Anti-Lock Brake (CAB), Air Bag Control Module (ACM) and Sentry Key Immobilizer Module (SKIM). See POWERTRAIN CONTROL MODULE under PROGRAMMING.
If vehicle is equipped with SKIM, secret key data must be updated to enable engine starting. See SENTRY KEY IMMOBILIZER MODULE under PROGRAMMING.
Inspect vehicle to ensure all engine components are connected properly. Reassemble and reconnect components as necessary.
The Leak Detection Pump (LDP) Monitor Test Mode has been added to the DRBIII(R) to verify repairs to the LDP system. A DRBIII(R) software program was written which causes the PCM to run the LDP monitor as part of this test. Test failures will be indicated through a stored DTC.
LDP Monitor Test Mode is a useful way to run a total system performance test. Use this test to verify any type of LDP system repair.
Software program makes temporary changes to operating mode of PCM. For this reason, it is critical that test not be interrupted. If PCM is left in this mode as result of interrupted test, PCM will illuminate the Malfunction Indicator Light (MIL) for 8-10 miles 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 above, the LDP Dealer Test should be re-run in its entirety so that the software program in the DRBIII(R) can restore the PCM operating mode.
Note similarity to LDP Monitor screen found under OBD-II Monitors. Failure modes are fewer in this system test than OBD-II LDP Monitor.
System test failure may have been due to a large leak, but the PCM will set the small leak DTC to indicate failures that occurred as part of the system test.
Connect the DRBIII(R) to the data link connector. Turn engine on. Turn off all accessories.
While test is being performed, PCM must see RPM, minimum MAP, no vehicle speed and minimum throttle position sensor (at idle, in park). With DRBIII(R) in System Tests, perform the LDP Monitor Test and follow the instructions on the screen.
If the LDP Monitor Test failed and a Small Leak DTC has set, the repair is not complete. Check for any related Technical Service Bulletin (TSB) and return to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
If any other DTC has set, test is not complete. If LDP monitor passed, the repair was successful and testing is now complete. Are any DTCs present? If yes, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, test is complete.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Powertrain Verification Test VER-6

Use the Manual With the Right Hardware

When to See a Mechanic

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