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-..

-- 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-.

Final Procedures 

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .