JDS - Carbon Canister Error
90jaguar09 JAGUARINCORRECT LAMBDA FEEDBACK DIAGNOSTIC
DURING ENGINE SET-UP SYSTEM
NO: 56
1990 MY
Model: SEDAN RANGE Date: NOVEMBER, 1990
KEY POINTS: PURGE VALVE REMAINS OPEN
ISSUE:
Due to an error in JDS Software Issue 4040, the carbon canister purge valve is not closed during engine set-up.
The additional rich or lean mixture gives an incorrect lambda feedback setting. Inability to correct for this can cause mis-diagnosis of the air flow meter, ECU and oxygen sensor.
ACTION:
Always clamp the carbon canister purge line closed before performing an engine set-up using Software Issue 4040.