P0443

DIAGNOSTIC TROUBLE CODES P0443, P0444, P0445
EVAP canister purge valve (EVAP valve), malfunctioning or not working at all

Fault Symptom.
The CHECK ENGINE lamp (MIL) is on. Conditions

If a short circuit/open circuit occurs, a DTC will be generated after 125 ms.

DIAGNOSTIC PROCEDURE

1. Checking The Operation Of The EVAP Canister Purge Valve
Connect the Scan Tool.
Ignition switch in the ON position.
Select "ACTIVATE".
Select "EVAP VALVE".

Listen for the sound of the valve in operation (clicking).

The command activates the valve at a frequency of 8 Hz for 10 seconds. For longer activation the command must be repeated.

If the valve clicks, continue with point 4.

If the valve does not click, continue with point 2.







2. Checking The EVAP Canister Purge Valve's Electrical Interfaces
Unplug connector H6-5 (located behind the RH direction indicator lamp).
Check the resistance of the valve. Take a reading of the resistance across pins 5 and 6 of the male connector. Nominal resistance is 40 ±20 ohms.

If the reading is OK, continue with the point below "Checking the voltage supply".

If the reading is not OK, check the wiring between connector H65 and the valve for continuity/shorting. If the wiring is OK, change the EVAP canister purge valve.

Check the voltage supply.
Connect a test lamp to pin 6 of the female connector and battery negative. The test lamp should light up.

If the test lamp lights up, continue with point 3.

If the test lamp does not light up, check the lead between pin 6 of the female connector and crimped connection J37 and take suitable action if necessary.

3. Checking The EVAP Canister Purge Valve's Electrical Interfaces (contd.)






Take readings at connector H6-6 (located behind the RH direction indicator lamp).

Check the connection to ground.
The valve is connected to ground via pin 5 of the 6ontrol module.

Connect the test lamp to pins 5 and 6 of the female connector.
Select "ACTIVATE".
Select "EVAP VALVE".
The test lamp should start flashing.

If the lamp flashes, continue with point 4.

If the lamp does not flash, check the lead between pin 5 of the female connector and pin 27 of the control module for continuity/shorting. If the lead is OK, continue with point 4.

3. Final Check
Clear the diagnostic trouble code, drive the car on test and check whether the trouble code is generated afresh.

If the DTC is generated again, refer to Before Replacing A Control Module.

If the DTC,is not generated again, the action taken to rectify the fault was correct, otherwise the fault is of intermittent nature.