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 MANUALSCHEVROLET1996SPORTVAN VAN PASSENGER EXTENDED, 6.5 YREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 18 (ENGINE CONTROLS - ADJUSTMENTS - 6.5L DIESEL)INJECTION PUMP TIMINGTDC OFFSET LEARN PROCEDURE
1996 Chevrolet Sportvan Van Passenger Extended, 6.5 Y
TDC Offset Learn Procedure
1996 Chevrolet Sportvan Van Passenger Extended, 6.5 YSECTION TDC Offset Learn Procedure
WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 1996 Chevrolet Chevy Van, 1995 GMC Yukon, 1995 GMC Vandura Special, 1995 GMC Vandura, and 1995 GMC Suburban. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
It takes PCM 20 seconds to learn TDC offset.
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.
- Start and warm engine to normal operating temperature. Connect Tech 1 scan tester. 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, then slightly rotate injection pump toward driver's side of vehicle. Tighten mounting nuts and repeat step 1).
- 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.
- To achieve a negative reading, rotate pump toward driver's side. To achieve a positive reading, rotate pump toward passenger's side.
RENDER: 1.0x
NO RELATED
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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.