WASTEGATE Bypass Regulator Valve, Checking
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- The Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- 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 GENERAL DIAGNOSIS .
Start diagnosis
-- Disconnect the Wastegate Bypass Regulator Valve -N75- electrical harness connector.
Checking internal resistance
-- Using a multimeter, check the Wastegate Bypass Regulator Valve -N75- -1- terminals 1 to 2 for resistance.
Specified value: 20 to 30 Ω (at approx. 20° C)
If the specification was not obtained:
-- Replace the Wastegate Bypass Regulator Valve -N75-.
If the specification is obtained:
Checking Voltage supply
-- Using a multimeter, check the Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal 1 to Ground (GND).
| Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal | Measure to |
|---|---|
| 1 | Engine Ground (GND) |
-- Operate the starter briefly.
Specified value: battery voltage.
-- Switch the ignition off.
If the specification was not obtained:
-- Check the wiring for a short circuit to Battery positive (+) or an open circuit.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the wiring connection.
If no malfunction is found in the wiring:
If the manufacturers test box is being used, perform the following step.
-- Install the test box. Refer to 68-PIN TEST BOX ADAPTER, VAG1598/19, INSTALLING .
If the manufacturers test box is not being used, perform the following step.
-- Remove the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-. Refer to DIESEL DIRECT FUEL INJECTION ECM, REPLACING .
-- Using a multimeter, check the Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal 2 to the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- electrical harness connector T60 terminal 29 for an open circuit.
| Wastegate Bypass Regulator Valve -N75- electrical harness connector terminal | Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- electrical connector T60 terminal or test box socket |
|---|---|
| 2 | 29 |
Specified value: 1.5 Ω 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, loose 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 Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-. Refer to DIESEL DIRECT FUEL INJECTION ECM, REPLACING .
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 .