ENGINE AND EMISSION CONTROL ± Emission Control System
17-15
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
negative (±) terminal of the power supply.
(2) Connect terminal No.3 and terminal No.4 to the
negative (±) terminal of the power supply.
(3) Connect terminal No.3 and terminal No.6 to the
negative (±) terminal of the power supply.
(4) Connect terminal No.1 and terminal No.6 to the
negative (±) terminal of the power supply.
(5) Connect terminal No.1 and terminal No.4 to the
negative (±) terminal of the power supply.
(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.
Cleaning the EGR Valve
Remove the EGR valve, and then check if the EGR valve
is stuck and carbon is accumulated in it. If so, use a wire
brush to clean the EGR valve.
Caution
Do not use a cleaning solvent. Solvent will penetrate to
the motor and malfunction of EGR valve will result.
EGR valve
Battery
MB991658
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