Evaporative Emissions (EVAP) Canister Purge Regulator Valve -N80-, Checking
NOTE:
- For a functional check of the EVAP canister purge regulator valve duty cycle (triggering), See Read measuring value block, display group 030, display field 3.
- Component locations, refer to "Component Overview - II" Locations ).
Checking resistance
- Disconnect EVAP canister purge regulator valve harness connector.
- Measure resistance of EVAP canister purge regulator valve.
Specified value: 20 to 28 ohms
If the specified value is not obtained:
- Replace EVAP canister purge regulator valve.
Checking voltage supply
- Disconnect EVAP canister purge regulator valve harness connector.
- Connect VAG 1527B voltage tester between connector terminal 1 and engine Ground (GND) using jumper wires from connector test kit VW 1594.
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger fuel pump relay -J17-, refer to " Basic Setting (Function 04)". Basic Setting (Function 04)
- Voltage tester must light up
If voltage tester does not light up:
- Check fuse for EVAP canister purge regulator valve.
- Check wiring for continuity between EVAP canister purge regulator valve connector terminal 1 and fuse, using wiring diagram.
- Check fuel pump relay and triggering, Testing and Inspection
Checking triggering
- Connect voltage tester VAG 1527 between EVAP canister purge regulator valve connector terminals 1 (B+) and 2 using jumper wires from connector test kit VW 1594.
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger EVAP canister purge regulator valve, refer to "Output Diagnostic Test Mode (Function 03)". Output Diagnostic Test Mode (DTM) (Function 03)
- Voltage tester must flash
If voltage tester does not flash or lights up constantly:
- Connect VAG 1598/19 test box to ECM.
If voltage tester lights up constantly:
- Check wiring between EVAP canister purge regulator valve connector terminal 2 and test box socket E12 (GND).
If voltage tester does not flash:
- Check wiring for continuity between EVAP canister purge regulator valve connector terminal 2 and test box socket E12.
Specified value: max. 1.0 ohms
- If necessary, eliminate short or open circuit in wiring.
If there is neither a break nor a short:
- Replace ECM.