P1494 Leak Detection Pump Pressure Switch

SYMPTOM
P-1494 LEAK DETECTION PUMP PRESSURE SWITCH

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

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

POSSIBLE CAUSES
- Fused ignition switch output circuit open
- LDP pressure switch circuit shorted to ground
- LDP switch sense circuit open
- LDP defective
- LDP wiring harness intermittent defect
- LDP wiring harness observable defect
- LDP vacuum hose leaking or obstructed
- PCM defective