Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1 (ENGINE CONTROLS - ON-VEHICLE ADJUSTMENTS)INJECTION PUMP TIMING/TDC OFFSET (DIESEL)TDC OFFSET LEARN PROCEDURE
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
TDC Offset Learn Procedure
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION 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.
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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.