TURBOCHARGER RECIRCULATING VALVE, CHECKING
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- The Motronic Engine Control Module (ECM) - J220- fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- On vehicles with automatic transmission, selector lever in position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.
Test procedure
Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK
Start diagnosis
Remove the engine cover with air filter Refer to Repair information.
Checking internal resistance
Disconnect the Turbocharger Recirculating Valve -N249- electrical harness connector -2-.
Scheme 92
Using a Multimeter, check the Turbocharger Recirculating Valve -N249- terminals 1 to 2 for resistance.
Specified value: 20 to 30 ohms (at approx. 20 °C)
If the specification was not obtained
Replace the Turbocharger Recirculating Valve -N249-. Refer to Repair information.
If the specification was obtained
Checking Voltage supply
Using a Multimeter, check the Turbocharger Recirculating Valve -N249- electrical harness connector terminal 1 to Ground (GND).
| Turbocharger Recirculating Valve -N249- electrical harness connector terminal | Measure to |
|---|---|
| 1 | Engine Ground (GND) |
Operate the starter briefly.
Specified value: battery voltage.
Switch the ignition off.
If the specified value was not obtained
Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
Check the electrical harness connector for damage, corrosion, lose or broken terminals.
If necessary, repair the wiring connection.
If no malfunctions are found in the wiring
Checking wiring
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 Turbocharger Recirculating Valve -N249- electrical harness connector terminal 2 to Motronic Engine Control Module (ECM) -J220- electrical harness connector T60 terminal 21 for an open circuit.
| Turbocharger Recirculating Valve -N249- electrical harness connector terminal | Motronic Engine Control Module (ECM) -J220- electrical connector T60 terminal or test box socket |
|---|---|
| 2 | 21 |
Specified value: 1.5 ohms max.
If the specification is not obtained
Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
Check the electrical harness connector for damage, corrosion, lose or broken terminals.
If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply was OK
Replace the Motronic Engine Control Module (ECM) -J220-. Refer to Repair information.
Install the engine cover with air filter. 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»(ref-496054-S19296251252012082100000) .
- If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(ref-496054-S06987146602012082100000) .
- If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(ref-496054-S23770317242012082100000) .