TDC Offset Learn Procedure

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2000 Pontiac Montana, 2000 Oldsmobile Silhouette, 2000 Oldsmobile Bravada, 2000 GMC Yukon XL, and 2000 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.

This procedure is only used when one of the following conditions exist:

DTC P1214 is set.
Engine has been replaced.
Front engine cover has been replaced.
PCM and injection pump have been replaced.
CKP sensor has been replaced.

Start engine and allow it to reach normal operating temperature. Connect scan tool to Data Link Connector (DLC). Clear all DTCs. Turn ignition on, with engine off. Using scan tool, select OUTPUT TEST/INJ PUMP mode. Activate TDC OFFSET LEARN.
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.
With engine running, PCM will learn new TDC OFFSET when normal operating temperature is obtained and engine speed is less than 1500 RPM. New TDC OFFSET will overwrite previous reading. If new learned TDC OFFSET reading is not between -.25 and -.75 degree, turn ignition off.
Slightly rotate injection pump and repeat step 1. A .039" (1.0 mm) pump movement equals about a 2 degree timing change. To achieve a negative reading, rotate pump toward driver's side. To achieve a positive reading, rotate pump toward passenger's side.