P1494

SYMPTOM
P1494-LEAK DETECTION PUMP SW OR MECHANICAL FAULT

WHEN MONITORED
Immediately after a cold start, with battery/ambient temperature between 40 deg. F and 90 deg. F and coolant temperature within 10 deg. F of battery/ambient.

SET CONDITION
The state of the switch does not change when the solenoid is energized.

POSSIBLE CAUSES
- Vehicle History and Service Bulletin Investigation
- LDP Switch Sense Circuit Shorted to Ground
- Wiring Harness Intermittent
- LDP Vacuum Supply
- Faulty Leak Detection Pump
- LDP Switch Sense Circuit Open
- Powertrain Control Module