Discovery I (LJ) V8-4.0L (1996)
Engine Control Module: All Technical Service Bulletins
ECM - DTC's P0443 & P0441 Sert
12/31/96
17/02/96/US
SUBJECT:
PRIDE - Canister Purge Control Valve (CANPV) Diagnosis
MODEL:
Range Rover 4.0/4.6
Discovery
AFFECTED VEHICLES:
LP
1995 - 1996 MY
LH
LJ
1996 MY
LD
DETAIL
The charcoal canister is designed to collect the fuel vapor generated in the fuel tank and transfer the vapor into the air stream entering the engine. This
ensures that the fuel vapor is burned during the combustion process and not allowed to escape into the atmosphere. The Charcoal in the canister absorbs
the fuel vapor to prevent condensation within the canister. The vapor is allowed to enter the air steam in a Controlled manner through the normally
closed purge valve. When the canister purge valve (CANPV) is activated, the valve is opened and closed in rapid succession (modulated) to introduce
fuel vapor into the air stream. The purge valve is modulated to prevent the introduction of large amounts of air that would be introduced if the purge
valve was left fully opened.
When the CANPV is modulating, the system monitors the oxygen sensor signal to determine if there is any vapor in the canister. If the oxygen sensor
signal shows a lean condition (no vapor in canister), the system turns off the purge valve.
When the vehicle is first turned on, the GEMS module performs a check of the purge valve to verify that is functioning electrically. If the system detects
an open or short condition, it will set DTC P0443. If the valve is functioning properly electrically, the system can determine if the valve is operating
mechanically by modulating the valve when the engine is running. Failure of the mechanical test will set DTC P0441. Follow the procedures outlined
below to troubleshoot DTC codes P0443 and P0441.
The diagnostic steps and repair procedures detailed in this bulletin were developed as an element of the Land Rover Way OPERATION PRIDE. This
TIB provides a library location for PRIDE information within the Land Rover North America technical literature system.
ACTION REQUIRED
Upon customer complaint for the symptoms outlined, perform the specified repairs.
PARTS INFORMATION
Range Rover:
ESR3001- Purge Valve
Discovery:
ESR3480 (1996 model year)
ESR4017 (1996.5 model year)
PROCEDURE
Perform the diagnostic procedures and repairs outlined in this bulletin for the repair of Purge Control Valve.