INTAKE AIR HEATER INCORRECT VOLTAGE
Possible causes
- Inatake air heater circuit open or shorter
- Faulty intake air heater relay
- Faulty intake air hearter
The engine control module ECM uses an intake air heater (IAH) to warm the incoming air for proper cylinder combustion. The ECM grounds the control coil of the IAH relay to energize the heater during cold operation. The ECM sends a bias voltage on diagnostic circuits one and two. If this voltage is not pulled low when the relay is OFF, or is high with the relay ON, DTC P0543 will set. The ECM will only store info on first failure, It triggers the SES light on the second failure.
Waht vehicle what year possibly left gas cap undone
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