EGR Valve Position/Lift Sensors
2-15
EGR Valve Position Sensor Test Procedure
Sensor may be tested on or off vehicle.
Warning: Observe all safety precautions (see page ii) if testing sensor on
vehicle.
1) Verify ignition key is OFF.
2) Check Tester battery
Refer to page 1-4. Set RANGE switch to POWER
OFF when done.
3) Disconnect wiring harness from sensor - Inspect
for damage.
Some vehicles use a metal snap ring to secure
wiring harness to sensor. Remove this snap ring
before disconnecting wiring harness.
4) Off-Car testing only: Remove sensor.
Note: Some sensors are permanently attached to
the EGR valve and cannot be removed.
5) Connect test leads according to diagram.
6) Verify test clips make good contact and do not
touch each other.
Make sure unused clips are not touching anything.
7) Set RANGE switch to HIGH.
8) Set FUNCTION switch to VOLTS.
9) Operate sensor - Watch TEST light for results.
(Note: TEST light may be on or off before sensor is
operated.)
On-Car test:
– Remove vacuum control hose from EGR valve.
– Connect hand vacuum pump to EGR valve.
– Gradually apply vacuum to slowly open valve.
RANGE
HIGH
LOW
POWER OFF
FUNCTION
VOLTS
OHMS
FREQUENCY
Summary of Contents for CP9087
Page 82: ...3 22 Notes...
