TDC Offset Learn Procedure

This procedure is only used when one of following conditions exists:

• Front cover and PCM are removed and replaced at same time.
• Injection pump and PCM are removed and replaced at same time.
• Front cover and/or crank sensor, pump and PCM are removed and replaced at same time.
• Front cover has been removed.
• Engine has been replaced.
  1. Start and warm engine to normal operating temperature. Connect Tech 1 scan tool. Using scan tester, select OUTPUT TEST or INJECTION PUMP mode, and activate TDC OFFSET LEARN.
     NOTE: If engine stalls when "TDC TIME SET" is activated, turn engine off. Loosen injection pump nuts. Slightly rotate injection pump toward driver's side of vehicle. Tighten mounting nuts and repeat step 1).
  2. If learned TDC OFFSET reading is between .00 and -.50 degrees, procedure is complete. If reading is not as specified, slightly rotate injection pump and repeat step 1). A 1-mm pump movement equals about 2 degrees timing.
  3. To achieve a negative reading, rotate pump toward driver's side. To achieve a positive reading, rotate pump toward passenger's side.