what is the troublecode 1491?

Asked by mistym Mar 05, 2012 at 05:54 AM about the 1999 Plymouth Neon

Question type: Maintenance & Repair

1999 neon has service engine soon, scans code P 1491

1 Answer
1,355

Robweiser answered 12 years ago

hello this is the answer and test you need to do for this code:SYMPTOM P1494 - LEAK DETECTION PUMP SWITCH OR MECHANICAL FAULT WHEN MONITORED Immediately after a cold start, with battery/ambient temperature between 40 °F - 90 °F and coolant temperature within 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 defect LDP switch sense circuit open LDP switch sense circuit shorted to ground LDP vacuum supply Leak detection pump defective PCM defective

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