Main Instrument Unit

Turbo Pressure Gauge:

Fault symptoms
Turbo pressure gauge in bottom position.

Condition
Short circuit to B+ in signal lead from Trionic.

Diagnostic help
A reading of the current turbo pressure can be obtained with the diagnostic tool.

The turbo pressure gauge can also be activated with the diagnostic tool.

Check the wiring harness
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic tool during the test.