TDC Offset Learn Procedure

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

• DTC 1214 is set.
• Engine has been replaced.
• Front engine cover has been replaced.
• PCM and injection pump have been replaced.

1. Start and warm engine to normal operating temperature. Connect Tech 1 scan tool. Clear all DTCs. Turn ignition on, with engine off. Using scan tool, select OUTPUT TEST/INJ PUMP mode. Activate TDC OFFSET LEARN.
2. If learned TDC OFFSET reading is between -.25 and -.75 degree, procedure is complete. If reading is not as specified, hold accelerator pedal in wide open throttle position for at least 45 seconds. Turn ignition off for 30 seconds. Start engine. TDC OFFSET reading should be zero. If reading is not zero, repeat step 1).
3. Start and warm engine to normal operating temperature. PCM will learn new TDC OFFSET when normal operating temperature is obtained and engine speed is less than 1500 RPMs. New TDC OFFSET will overwrite previous reading. If new learned TDC OFFSET reading is not between -.25 and -.75 degree, turn ignition off.
4. Slightly rotate injection pump and repeat step 1). A 1-mm pump movement equals about 2 degrees timing. To achieve a negative reading, rotate pump toward driver's side. To achieve a positive reading, rotate pump toward passenger's side.