EMISSION CONTROL - V8
For systems utilising the vacuum method for determining evaporation leaks, the sensor is used to monitor for a drop
in vacuum pressure. The evaporation system is sealed by the CVS valve and purge valve after a vacuum has been
previously set up from the intake manifold while the purge valve is open and the CVS valve is closed. If any holes or
leaks are present at the evaporation system joints, the vacuum pressure will gradually drop and this change in
pressure will be detected by the fuel tank pressure sensor. This system is capable of determining leaks down to 1 mm
(0.04 in.) in diameter.
The fuel tank pressure sensor is part of the NAS OBD system, a component failure will not be noticed by the driver,
but if the ECM detects a fault, it will be stored in the diagnostic memory and the MIL light will be illuminated on the
instrument pack. Possible failures are listed below:
l
l
l
l
l
l
l
Damaged or blocked sensor
Harness / connector faulty
Sensor earthing problem
Open circuit
Short circuit to battery voltage
Short circuit to ground
ECM fault
Possible failure symptoms of the fuel tank pressure sensor are listed below:
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l
l
Fuel tank pressure sensor poor performance
Fuel tank pressure sensor low range fault
Fuel tank pressure sensor high range fault
If the fuel tank pressure sensor should malfunction, the following fault codes may be stored in the ECM diagnostic
memory, which can be retrieved using TestBook/T4:
P-code
P0451
P0452
P0453
Description
Fuel tank pressure signal stuck high within range
Fuel tank pressure signal short circuit to battery voltage (out of range - High)
Fuel tank pressure signal short circuit to ground or open circuit (out of range - Low)
DESCRIPTION AND OPERATION 17-2-23
| Categories | Land Rover Defender, Land Rover Discovery II, Range Rover |
|---|---|
| Tags | Land Rover |
| Model Year | 1999 |
| Download File |
|
| Document Type | Workshop Manual |
| Language | English |
| Product Name | Discovery Series II |
| Product Brand | Land Rover |
| Document File Type | |
| Publisher | landrover.com |
| Wikipedia's Page | http://en.wikipedia.org/wiki/Land_Rover |
| Copyright | Attribution Non-commercial |
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