Testing If Display Approx. 140° C

-- Switch ignition ON.

-- Disconnect the MAF / IAT sensor -G70 / G42- electrical harness connector.

-- Check the value indicated on the scan tool display.

-- Switch ignition off.

If indication decreased to approx. -40° C or -46° C:

-- Replace the MAF / IAT sensor -G70 / G42- Refer to the Repair Information.

If the indication remains at approx. 140° C

If the manufacturers test box is being used, perform the following step.

-- Install the test box.

If the manufacturers test box is not being used, perform the following step.

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

-- Disconnect the ECM harness.

-- Using a multimeter, check the MAF / IAT sensor -G70 / G42- electrical harness connector terminal 3 to engine ground.

Specified value: OL or no continuity.

If the specified value was Not obtained:

-- Check the wiring for a short circuit to ground.

-- If necessary, repair the faulty wiring connection.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If no malfunction is detected in the wiring and the sensor resistance was OK:

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

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 .