P154B - Intake Air Heater Voltage Signal Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

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

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P154b 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°C (104°F). The IAH is connected to the GPCM by the following circuits:

- 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

OBDII Code P154b - Intake Air Heater Voltage Signal Circuit - AutoCodes.com

P154B Information for specific makes

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