P1494

Tests 1 - 2:

Tests 3 - 7:

SYMPTOM
P1494 - LEAK DETECTION PUMP SWITCH OR MECHANICAL FAULT

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

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

POSSIBLE CAUSES
- Wiring harness intermittent problem
- LDP switch sense circuit open
- LDP switch sense circuit shorted to ground
- LDP vacuum supply
- Leak detection pump
- Powertrain control module