P0453

DTC P0453
Fuel tank pressure sensor fault Drive cycle C:Signal out of range - above maximum.

Possible causes by suggested order of priority:
^ Fuel tank pressure sensor fault.
^ Open circuit C132/3 (GK) to C637/14 (GK).
^ Open circuit C132/2 (RB) to C636/6 (RB).
^ 5V sensor supply voltage C132/1 (R).
^ Connectors C132, ECM C636 (B), ECM C637 (B).

Fuel Tank Pressure Sensor Fault.
CHECK THE FOLLOWING:
^ Sensor pipe to fuel tank or vent port to open air are not blocked.
^ Open circuit, voltage or connector problems are not present.
^ Check sensor by substitution with a known good unit.
POSSIBLE FAULTS
^ Faulty pressure sensor.
^ Pressure sensor vacuum or reference ports blocked.

Open Circuit C132/3 (GK) to C637/14 (GK).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Open Circuit C132/2 (RB) to C636/6 (RB).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

5V sensor supply voltage C132/1 (R).
CHECK THE FOLLOWING:
^ 5V sensor supply voltage C132/1 (R).
ACCEPTABLE RESULTS
^ Between 4.5 V and 5.5 V.
DIAGNOSTIC HINTS
^ If the voltage is too high a short circuit to battery or faulty ECM should be suspected.
^ If the voltage is too low an open circuit or connector problem should be suspected.

Connectors C132, ECM C636 (B), ECM C637 (B).
CONNECTOR
^ Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.