Harsh Up-Shift When Decelerating

Harsh Up-Shift when Decelerating (overrun upshift)

Vehicle with diesel engine

Cause/remedy:

Vacuum build-up too slow when decelerating.

1. Disconnect vacuum auxiliaries from the system on the transmission side.

2. Check vacuum-controlled emission-relevant components.

3. Check output of vacuum pump and vacuum line routing.

4. Install a 0.6 mm dia. restrictor in the line to the VCV connection on the vacuum transducer. Part No.601 078 00 23

Note:
Only install restrictor on natural aspirated diesel engine.