Testing if display approx. 140 °C:
-- Disconnect the Intake Air Temperature (IAT) Sensor 2 -G299- electrical harness connector -arrow-.
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 Repair information.
If the indication remains at approx. 140 °C:
Checking wiring
Add as a workstep to the procedure where required.
If the manufacturers test box is being used. Perform the following step.
-- Install the test box. Refer to Repair information.
If the manufacturers test box is not being used. Perform the following step.
-- Remove the Motronic Engine Control Module (ECM) -J220-. Refer to Repair information.
-- Using a Multimeter --, check the Intake Air Temperature (IAT) Sensor -G42 - electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J220- electrical harness connector T60 terminals for an open circuit according to the wiring diagram.
| Intake Air Temperature (IAT) Sensor -G42 - electrical harness connector terminals | Motronic Engine Control Module (ECM) -J220- electrical connector T60 terminals or test box socket |
|---|---|
| 1 | 13 |
| 2 | 14 |
Specified value: 1.5 Ω Max.
If the specification was not obtained:
-- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
-- If necessary, repair the faulty wiring connection.
-- Check the electrical harness connector for damage, corrosion, lose or broken terminals.
If no malfunction is detected in the wiring:
-- Replace the Motronic Engine Control Module (ECM) -J220-. Refer to Repair information.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .