P0443

EVAP CANISTER PURGE VALVE





Symptom Of Fault.
The CHECK ENGINE lamp (MIL) is on. Any other diagnostic trouble codes (closed loop, misfiring)

Conditions.
Purge valve active.
P0443: All-embracing DTC.
P0444: Open circuit for more than 2 seconds.
P0445: Short circuit to ground for more than 2 seconds.

Diagnostic Help.
The purge valve can be activated with the ISAT scan tool.
- Select "ACTIVATE".
- Select "EVAP VALVE".
The valve is activated for 10 seconds at a frequency of 8 Hz 50%. The valve clicks when activated.





Diagnostic Procedure.
1. Check the valve and the leads connected to it
- Unplug connector H6-5 (located behind the right-hand direction indicator).
- Take a resistance reading in the male connector across pins 5 and 6.

Nominal resistance is 26 ± 3 ohms.

Is the resistance reading OK?
YES:
^ continue with point 2.
NO:
^ Repair or replace the lead or, if necessary, change the valve. Then continue with point 4.





2. Check the valve's power supply
- Start the engine and run it at idling speed.
- Connect the test lamp to pin 6 of the female connector and battery negative (B-)

Is the test lamp on?
YES:
^ continue with point 3.
NO:
^ Repair or replace the lead between pin 6 and crimped connection J37 and continue with point 4.

3. Check the valve's ground connection
- Check the lead between pin 5 of the female connector and pins 21 and 27 of the control module.
Is the wiring OK?
YES
^ Change the EVAP canister purge valve and continue with point 4.
NO
^ Rectify the fault and proceed to point 4.





4 Final check:
- Clear the diagnostic trouble code.
- Perform a driving cycle:
^ Start the engine and run it at idling speed until the temperature of the coolant exceeds 60°C(140°F) or for at least 1 minute if this temperature is reached earlier.
^ Drive the car for 5 minutes at varying engine rpm and loads.
- Evaluation of the driving cycle. Check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?
YES
^ Proceed at "Before Replacing a Control Module". Component Tests and General Diagnostics
NO:
^ The remedial measure taken was correct.