Testing If Display Near 140°C

-- Disconnect the MAP / IAT sensor -G71 / G42- electrical harness connector.

-- Turn the ignition switch ON

-- Using the scan tool, check the intake air temperature:

If indication jumps to approx. -40 °C to -46 °C:

-- Switch ignition OFF.

-- Replace the MAP / IAT sensor -G71 / G42-.

If the indication remains at approx. 140 °C:

Checking wiring

-- Remove the Engine Control Module (ECM) -J623-. Refer to the Repair Information

-- Disconnect the T60 connector.

-- Using a multimeter, check for continuity between the MAP / IAT sensor -G71 / G42- electrical harness connector terminal 2 to an engine ground, refer to the wiring diagram.

-- Using a multimeter, check for continuity between the MAP / IAT sensor -G71 / G42- electrical harness connector terminal 2 to terminal 1, refer to the wiring diagram.

Specified value: OL or no continuity.

-- Repair the short to ground.

If no malfunction is detected in the wiring:

-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair Information.