Tech Tip Fix: Volkswagen Diesel Dynamic Pump Timing 1.9L TDI ALH Diesel Engines
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Volkswagen Diesel Dynamic Pump Timing 1.9L TDI ALH Diesel Engines
by Steve Griff, WORLDPAC Assist European Specialist
In this example a 2003 Volkswagen Jetta with Engine 1.9L TDI ALH had a timing belt replaced and resetting of the Injection Pump Dynamic Timing was performed.
Diagnostic Procedures:
NOTE: When any work is performed on a 1.9L TDI diesel that involves the timing belt, Dynamic Injection Pump Start of Injection Timing must be checked and adjusted as necessary.
- It is strongly recommended that the proper cam and pump locking tools are used when servicing the timing belt. Incorrect timing can easily occur if the lock down tools is not used. The VW 3418 Cam Jig and the VW 3359 Pump Locating Pin should be used.
- Once the basic mechanical timing is set using the lock down tools, a full function VW compatible scan tool is required to set the dynamic pump timing.
- Dynamic timing specification is based off actual fuel temperature while the engine is running.
- Use the scan tool to enter Engine Address Word 01, Function 04 Basic settings and Display Group 000. 10 Data fields will be displayed. Display field 2 indicates the actual Dynamic Pump Start of Injection Timing. Display Field 9 indicates current fuel temperature.
- With the engine running at idle check the value in Field 2. Typically a value of about 65 at an indicated fuel temperature in field 9 of 90 is normal.
NOTE: For every 10 degrees hotter than 90 in field 9 subtract 2 from field 2 to calculate the normal timing value. For every 10 degrees cooler than 90 in field 9 add 2 to the value in field 2 to calculate normal timing value. - If the value in field 2 is not correct, shut off the engine and adjust timing by loosening the 3 bolts at the pump gear until the center shaft can be moved
NOTE: Moving the center shaft to the left advances timing and raises the timing number in field 2; moving the center shaft to the right retards timing and lowers the number in field 2.
UNDER NO CIRCUMSTANCES LOOSEN THE CENTER BOLT!
If the center bolt is loosened the internal pump timing is changed and the pump must be retimed on a test bench! - Small movements will cause large changes in pump timing so be careful.
- Once timing is correctly set, retighten the 3 pump bolts, restart the engine and re-verify correct dynamic timing numbers.
After performing the timing procedures normal vehicle operation was restored.
This Tech Tip Fix was performed and documented by Steve Griff, WORLDPAC Assist European Specialist.
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