Egr Valve Check <Gdi - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

ENGINE AND EMISSION CONTROL –
EGR valve
EGR valve
Battery
EGR VALVE CHECK <GDI>
Intake
Checking the Operation Sound
manifold
1. Check that the operation sound of the stepper motor can
be heard from the EGR valve when the ignition switch
is turned to ON (without starting the engine).
2. If the operation sound cannot be heard, check the stepper
motor drive circuit.
NOTE
If the circuit is normal, the cause is probably a malfunction
of the stepper motor or of the engine-ECU.
Checking the Coil Resistance
1. Disconnect the EGR valve connector.
2. Measure the resistance between the EGR valve-side
connector terminal No.2 and terminal No.1 or terminal
No.3.
Standard value: 10 – 20 Ω (at 20 C)
3. Measure the resistance between the EGR valve-side
connector terminal No.5 and terminal No.4 or terminal
No.6.
Standard value: 10 – 20 Ω (at 20 C)
Operation Check
1. Remove the EGR valve.
2. Connect the special tool (test harness set) to the EGR
valve-side connector.
3. Connect terminal No.2 and terminal No.5 to the positive
(+) terminal of power supply of approximately 6 V.
4. Connect each clip to the negative (–) terminal of power
supply in the order given below to test if any vibration
occurs (as though the stepper motor is shaking slightly)
due to the operation of the stepper motor.
(1) Connect terminal No.1 and terminal No.4 to the
(2) Connect terminal No.3 and terminal No.4 to the
(3) Connect terminal No.3 and terminal No.6 to the
(4) Connect terminal No.1 and terminal No.6 to the
(5) Connect terminal No.1 and terminal No.4 to the
MB991658
(6) Repeat the test in the order from (5) to (1).
5. If the results of testing show that the vibration could be
felt, the stepper motor is normal.
Emission Control System
negative (–) terminal of the power supply.
negative (–) terminal of the power supply.
negative (–) terminal of the power supply.
negative (–) terminal of the power supply.
negative (–) terminal of the power supply.
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