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.
SHORT_CIRCUIT
^ Check resistance < 5.0

Short Circuit C637/17 (WS) To Vehicle Earth.
OPEN_CIRCUIT
^ Check resistance > 1M

Open Circuit C230/15 (WS) to C637/17 (WS).
OPEN_CIRCUIT
^ Check resistance > 1M

Connector(s) C230,ECM C637 (B).
CONNECTOR
^ 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