P154C – Intake Air Heater Current Signal Circuit

P154C Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P154C Possible Causes

Faulty Intake Air Heater,Intake Air Heater harness is open or shorted,Intake Air Heater circuit poor electrical connection

P154C Description

The Intake Air Heater (IAH) is located in the air inlet tube and is used to warm the incoming air to aid in starting the engine and for proper cylinder combustion. The Glow Plug Control Module (GPCM) will command the IAH on when the engine coolant temperature is below 40?? (104??). Power to the IAH is supplied by the battery positive voltage circuit. The IAH is connected to the GPCM by the following circuits. If there is a fault on any of these circuits a DTC will set. – The IAH temperature signal circuit – The IAH command 1 circuit – The IAH command 2 circuit – The IAH voltage signal circuit – The IAH current signal circuit – The IAH feedback signal circuit