Wait To Start Light: Description and Operation
WAIT-TO-START WARNING LAMP - ECM OUTPUTThe wait-to-start warning lamp is located on the instrument panel.
The wait-to-start warning lamp is turned on and off by the Engine Control Module (ECM) based on inputs from the MAP sensor and the intake manifold air temperature sensor.
The lamp is turned on when the key is first activated. If the ECM reads intake manifold air temperature below 19 °C (66 °F), it will turn the wait-to-start warning lamp on for the air heater pre-heat cycle. The lamp stays on until the pre-heat cycle is over.
Refer to the Powertrain Diagnostic Procedures for electrical operation and complete description of the intake heaters, including pre-heat and post-heat cycles.