Canister Purge Control Valve: Testing and Inspection

Diagnostic Procedures



EVAP Canister Purge Regulator Valve 2, Checking

Solenoid valve is closed when no voltage is present.

Special tools, testers and auxiliary items required

• Hand multimeter (V.A.G 1526) or Multimeter (V.A.G 1715)

• Test adapter kit (V.A.G 1594)

• Wiring diagram

• Motronic Engine Control Module (ECM) Power Supply Relay (J271) must be OK, checking:

• The Ground (GND) connections between engine and body must be OK.

• Ignition switched off.

• Fuses in right instrument panel fuse holder must be OK:

Right instrument panel fuse holder





Test Sequence

Observe safety precautions => [ Safety Precautions ] Safety Precautions.

Observe rules for cleanliness => [ Clean Working Conditions ] Clean Working Conditions.

- Remove 2-pin connector from Evaporative Emission (EVAP) Canister Purge Regulator Valve 2 (N333) at installation location,

Check resistance

- Check resistance between terminals of solenoid valve. Specification: 24.0 to 28.0 ohms





If specification is not obtained:

- Replace Evaporative Emission (EVAP) Canister Purge Regulator Valve 2 (N333), refer to Repair Manual

- Erase DTC memory of Engine Control Module (ECM) => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09, Diagnostic mode 4: Reset/erase diagnostic data.

- Generate readiness code => [ Readiness Code, Generating ] Monitors, Trips, Drive Cycles and Readiness Codes.

If specification is obtained:

- Check wires to control module according to wiring diagram, refer to Repair Manual.

Check wires to control module

- Connect test box to Engine Control Module (ECM) 2 (J624) wiring harness on connecting test box for wiring test.

- Check wire between test box socket 64 + terminal 2 of 2-pin connector for open circuit according to wiring diagram. Wiring resistance: max. 1.5 ohms





- Check wire for short circuit to B+ and Ground (GND). Specification: infinite ohms

- Check wire between 1-pin connector terminal 2 and Motronic Engine Control Module (ECM) Power Supply Relay (J271) for open circuit according to wiring diagram. Wiring resistance: max. 1.5 ohms

- Erase DTC memory of Engine Control Module => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09, Diagnostic mode 4: Reset/erase diagnostic data.

- Generate readiness code => [ Readiness Code, Generating ] Monitors, Trips, Drive Cycles and Readiness Codes.

If no fault is detected in the wiring:

- Replace Engine Control Module (ECM) 2 (J624).