Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-, Checking
Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-, Checking
Recommended special tools and equipment
- V.A.G 1526A multimeter
- V.A.G 1594A connector test kit
- V.A.G 1598/31 test box
Test requirements:
- Fuse for Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- OK
- Fuel Pump (FP) Relay OK; checking. Fuel Pump (FP) Relay -J17- and Activation, Checking
- Ignition switched off.
NOTE: Voltage for Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- is supplied via the fuel pump relay.
Procedure
- Disconnect electrical harness connector -3- from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- (item -2-).
NOTE:
- Depicted in illustration with air filter cover removed.
- Disregard the other items.
Checking internal resistance
- Connect multimeter at valve for resistance measurement.
- Specified value: 22 to 30 ohm
If specified value is not obtained.
- Replace Evaporative Emission (EVAP) canister purge regulator valve -N80-.
If specified value is obtained:
Checking voltage supply
- Connect multimeter between terminal 1 and 2 for voltage measurement.
- Operate starter briefly.
- Specified value: approx. battery voltage
If there is no voltage.
- Connect multimeter for voltage measurement as follows.
Harness connector Measure to
Terminal
1 Engine Ground (GND)
- Operate starter briefly.
- Specified value: approx. battery voltage
If there is no voltage again:
- Check wire connection from harness connector terminal 1 to Fuel Pump (FP) Relay -J17- via fuse for open circuit according to wiring diagram.
- Specified value: Wire resistance max 1.5 Ohms
- If necessary, repair wire connection.
If voltage supply is OK:
Check Ground (GND) activation
- Connect multimeter for voltage measurement as follows:
Harness connector Measure to
Terminal
2 B+
- Operate starter briefly.
- Specified value: approx. battery voltage
- Switch ignition off.
If specified value is not obtained:
- Connect test box to wiring harness of Engine Control Module (ECM), ECM is not connected. Test Box, Connecting For Wiring and Component Test
- Check the following wire connection for open circuit according to wiring diagram:
Harness connector Measure to
Terminal
2 64
Specified value: Wire resistance max 1.5 Ohms
- Check the wire for short circuit to B+ and Ground (GND).
- Specified value: Infinite Ohms (no continuity)
- If necessary, repair wire connection.
If no malfunctions are found in wires:
- Replace Engine Control Module (ECM).
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory see "Mode 3: Check DTC memory". Mode 3: Check DTC Memory
2. If necessary, erase DTC memory see "Mode 4: Reset/erase diagnostic data". Mode 4: Reset/Erase Diagnostic Data
3. Generate readiness code. Readiness Code, Generating
- End diagnosis and switch ignition off.