C 1500 Truck 2WD V8-393 6.5L DSL Turbo (1994)
Engine Control Module: Service and Repair
TDC Offset Program Procedure
PROCEDURE
This procedure allows the Powertrain Control Module (PCM) memory to be updated with the correct Top Dead Center (TDC) offset for the
vehicle. Diagnostic Trouble Code (DTC) 88 will be stored until this procedure has been completed.
SET UP AS FOLLOWS:
1. Battery is fully charged.
2. Engine operating at idle.
3. Vehicle at operating temperature.
4. Connect Tech 1 scan tool.
5. Select "OUTPUT TESTS" and "INJ PUMP."
6. Activate "TDC LEARN."
NOTE: It takes PCM 20 seconds to learn TDC offset.
7. Verify "TDC OFFSET" in data list.
8. DTC 88 will be stored if procedure has NOT been done correctly.
9. If the PCM fails to program the TDC OFFSET, do the following:
a. Check all PCM connections.
b. Check Techline terminal/equipment for latest software version.
c. Try again to program the PCM. If it fails again replace the PCM.
