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What to check in EVAP canister purge valve?

ubergeek
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ubergeek Member

ubergeek

Posted
Posted

I see EVAP canister purge valve is one of a few things to check but I am not sure exactly I should look for.

Sorry if this is a dumb question but i've tried to search for tips but no luck.

Thanks in advance.

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Loren Member

Loren

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Here are all the tests you can perform on the purge valve (since you did not say what your fault code was):

Check purge air line for blockage.

1. Remove front right-hand wheel housing liner.

2. Detach purge air line (connection face up) from EVAP canister.

3. Blow through purge air line with compressed air.

Check voltage supply for EVAP canister purge valve.

1. Remove connector of EYAP canister purge valve.

2. Connect voltmeter (positive) to EYAP canister purge valve connector, pin 1, and ground.

3. Switch on the ignition.

Display: battery voltage

Check EVAP canister Purge valve.

1. Remove connector of EVAP canister purge valve.

2. Connect ohmmeter to EVAP canister purge valve pins 1 and 2.

Display: 26 ± 4 ohms at 20°C.

Check triggering wire for EVAP canister purge valve.

1. Remove connector of EVAP canister purge valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect ohmmeter to EVAP canister purge valve, pin 2, and special tool 9616, pin 61.

Display: 0 - 5 ohms

Check triggering wire for EVAP canister purge valve for short circuit to B+.

1. Remove connector of EVAP canister purge valve.

2. Connect special tool 9616 to wiring harness (DME control module connector),

3. Connect voltmeter (positive) to EVAP canister purge valve connector, pin 2, and ground.

4. Switch on the ignition.

Display: 0 V

If battery voltage is displayed, check wiring harness for chafing and pinching damage.

Check triggering wire for EVAP canister purge valve for short circuit to ground.

1. Remove connector of EVAP canister purge valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect ohmmeter to EVAP canister purge valve connector, pin 2, and ground.

Display: infinite ohms

If 0 to 5 ohms is displayed, check wiring harness for chafing and pinching damage

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ubergeek Member

ubergeek

Posted
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Posted

Thanks Loren. I am getting P1123 sporadically and going thru all possible causes. (MAF, O2 and etc)

This is related to my earlier posting. (http://www.renntech.org/forums/index.php?showtopic=12676&st=0&p=62348entry62348)

Here are all the tests you can perform on the purge valve (since you did not say what your fault code was):

Check purge air line for blockage.

1. Remove front right-hand wheel housing liner.

2. Detach purge air line (connection face up) from EVAP canister.

3. Blow through purge air line with compressed air.

Check voltage supply for EVAP canister purge valve.

1. Remove connector of EYAP canister purge valve.

2. Connect voltmeter (positive) to EYAP canister purge valve connector, pin 1, and ground.

3. Switch on the ignition.

Display: battery voltage

Check EVAP canister Purge valve.

1. Remove connector of EVAP canister purge valve.

2. Connect ohmmeter to EVAP canister purge valve pins 1 and 2.

Display: 26 ± 4 ohms at 20°C.

Check triggering wire for EVAP canister purge valve.

1. Remove connector of EVAP canister purge valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect ohmmeter to EVAP canister purge valve, pin 2, and special tool 9616, pin 61.

Display: 0 - 5 ohms

Check triggering wire for EVAP canister purge valve for short circuit to B+.

1. Remove connector of EVAP canister purge valve.

2. Connect special tool 9616 to wiring harness (DME control module connector),

3. Connect voltmeter (positive) to EVAP canister purge valve connector, pin 2, and ground.

4. Switch on the ignition.

Display: 0 V

If battery voltage is displayed, check wiring harness for chafing and pinching damage.

Check triggering wire for EVAP canister purge valve for short circuit to ground.

1. Remove connector of EVAP canister purge valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect ohmmeter to EVAP canister purge valve connector, pin 2, and ground.

Display: infinite ohms

If 0 to 5 ohms is displayed, check wiring harness for chafing and pinching damage

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