Federal Emissions

INTAKE AIR HEATER (IAH) RELAY REPLACEMENT (FEDERAL EMISSIONS)

REMOVAL PROCEDURE

IMPORTANT: The intake air heater (IAH) relay is part of the glow plug controller on vehicles equipped with federal emissions.




1. Disconnect the negative battery cable.
2. Loosen the outlet duct clamp at the upper intake manifold.
3. Remove the upper intake manifold cover from the outlet duct.
4. Remove the upper intake manifold cover.




5. Using a flat bladed screwdriver, disengage the glow plug controller cover clips.




6. Remove the glow plug controller cover.




7. Remove the glow plug controller nuts.




8. Lift the glow plug controller off the studs.




9. Separate the intake heater relay from the glow plug controller housing by inserting a small screwdriver between them while prying the relay assembly outward.




10. Slide the intake heater relay outward to disengage it from the glow plug controller housing.




11. Using a flat bladed screwdriver, disengage the intake heater relay clip.




12. Remove the intake heater relay.

INSTALLATION PROCEDURE




1. Install the intake heater relay.




2. Slide the intake heater relay inward to engage it to the glow plug controller housing.




3. Place the glow plug controller onto the studs.

NOTE: Refer to Fastener Notice in Service Precautions.




4. Install the glow plug controller nuts.

Tighten
Tighten the nuts to 42 N.m (31 lb ft).




5. Install the glow plug controller cover.




6. Install the upper intake manifold cover.
7. Install the upper intake manifold cover to the outlet duct.
8. Tighten the outlet duct clamp at the upper intake manifold cover.

Tighten
Tighten the clamp to 6 N.m (53 lb in).

9. Connect the negative battery cables.