P1494

Tests 529 - 533:

Tests 534 - 538:

Test 539:

SYMPTOM
P-1494 LEAK DETECTION PUMP SW OR MECHANICAL FAULT

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

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

POSSIBLE CAUSES
- DTC not equal freeze frame DTC
- Fused ignition switch output circuit open
- LDP pressure switch circuit short to ground
- Leak detection pump switch sense circuit open
- Leak detection pump defective
- Wiring and connectors observable defect
- Wiring harness intermittent defect
- Powertrain control module defective
- Vacuum hose leak or obstruction