P1001

DIAGNOSTIC TROUBLE CODES P1001, P1002
EVAP canister purge valve, output from control module too low/high,
No continuity or shorting to ground/batt+.

Fault Symptom.
CHECK ENGINE lamp (MIL) on.

Condition
No continuity or shorting to ground/batt+ in the circuit to pin 5.

Diagnostic Procedure.
1. Activate the ISAT command "EVAP VALVE" in the 'ACTIVATE" menu and listen to check whether the purge valve is working.

If the valve is working, proceed to step 4.
If it is not, continue at step 2.

2. With the ignition in the DRIVE position, check that current is present on pin 1 of the EVAP canister purge valve (from pin 87 of the main relay via fuse 38).
Unplug the valve's connector and measure the resistance across pins 1 and 2 of the valve.
The correct resistance is about 26 ohms.

If the resistance is not correct, change the valve.
If the resistance is correct, check whether the valve opens by applying current to pin 1 and connecting pin 2 to ground, using a jumper lead.
If the valve does not open, change it.
If the valve is OK, continue with the next step.





3. With the ignition switched OFF and all current consuming equipment disconnected, measure the resistance across pin 2 of the valve connector and a good grounding point on the engine.
The resistance should be 20-40 kOhms.

If it is NOT, check the lead to pin 5 of the control module for continuity and/or a short circuit.

4. Clear the diagnostic trouble codes, drive the car on the road to see whether the trouble code is generated afresh. if it is, continue at "Before Control Module Replacement" for further diagnostic instructions. Before Replacing A Control Module