P0654

DTC P0654
Engine Speed signal (power stage) Drive cycle A:Signal missing.

DTC P0654
Engine Speed signal (power stage) Drive cycle A:Signal out of range - above maximum.

DTC P0654
Engine Speed signal (power stage) Drive cycle A:Signal out of range - below minimum.


Possible causes by suggested order of priority:
- Short circuit C637/17 (WS) to vehicle +12V.
- Short circuit C637/17 (WS) to vehicle earth.
- Open circuit C230/15 (WS) to C637/17 (WS).
- Connector(s) C230,ECM C637 (B).
- Faulty instrument pack.
- Faulty ECM.

Short circuit C637/17 (WS) to vehicle +12V.
- Check resistance < 5.0 Ohm

Short circuit C637/17 (WS) to vehicle earth.
- Check resistance > 1M Ohm

Open circuit C230/15 (WS) to C637/17 (WS).
- Check resistance > 1M Ohm

Connector(s) C230,ECM C637 (B).
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

Faulty instrument pack.
CHECK THE FOLLOWING:
- Eliminate any possible harness or connector faults.
- Check instrument pack by substituting a known good unit.
POSSIBLE FAULTS
- instrument pack Faulty

Faulty ECM.
CHECK THE FOLLOWING:
- Eliminate all other fault possibilities before suspecting the ECM.
- Failure of this component is unlikely.
- Check ECM by substituting a known good unit.
POSSIBLE FAULTS
- ECM Faulty