P1494

Test 1:

Tests 2 - 5:

Tests 6 - 9:

SYMPTOM
P1494 - LEAK DETECTION PUMP PRESSURE SWITCH

WHEN MONITORED
Immediately after a cold start, with ambient temperature between 4 °C (40 °F) and 32 °C (90 °F) and engine coolant temperature within -12 °C (10 °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