Testing if display Approx. 140° C:
-- Disconnect the Intake Air Temperature (IAT) Sensor -G42- electrical harness connector -1-.
If indication jumps to Approx. -40° C or -46° C:
-- End diagnosis and switch ignition off.
-- Replace the Intake Air Temperature (IAT) Sensor -G42 -. Refer to appropriate Service Information.
If the indication remains at Approx. 140° C:
Checking wiring
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 appropriate Service Information.
-- Using a Multimeter --, check the Intake Air Temperature (IAT) Sensor -G42 - electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for resistance.
| Intake Air Temperature (IAT) Sensor -G42 - electrical harness connector terminals | Engine Control Module (ECM) -J623- electrical harness connector T60 terminals or test box socket |
|---|---|
| 1 | 42 |
| 2 | 13 |
Specified value: 1.5 Ω Max.
If the specification was not obtained:
-- Check the wiring for an open circuit, a short circuit to Battery (+), or an open circuit.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring:
-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY.
-- Perform a road test to verify repair.
If the DTC does not return:
Generate readiness code. Refer to READINESS CODE.
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK:
-- Replace the Engine Control Module (ECM) -J623-. Refer to appropriate Service Information.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
- Check the DTC memory. DIAGNOSTIC MODE 03 - READ DTC MEMORY.
- If necessary, erase the DTC memory. DIAGNOSTIC MODE 04 - ERASE DTC MEMORY.
- If the DTC memory was erased, generate readiness code. READINESS CODE.