EXHAUST GAS RECIRCULATION VALVE (STEPPER MOTOR) CHECK Page 1 of 2
EXHAUST GAS RECIRCULATION VALVE
(STEPPER MOTOR) CHECK
CHECKING THE OPERATION
SOUND
1.Check that the operation sound of the
stepper motor can be heard from the exhaust
gas recirculation valve when the ignition
switch is turned ON (without starting the
engine).
2.If the operation sound cannot be heard,
inspect the drive circuit of the stepper motor.
If the circuit is normal, either the
note stepper motor or the
engine-A/T-ECU may have failed.
CHECKING THE COIL
RESISTANCE
1.Remove the exhaust gas recirculation valve.
2.Measure the resistance between terminal
No. 2 and either terminal No. 1 or terminal No.
3 of the connector at the exhaust gas
recirculation valve.
Standard value: 20 - 24 Ω (at 20°C)
3.Measure the resistance between terminal
No. 5 and either terminal No. 6 or terminal No.
4 of the connector at the exhaust gas
recirculation valve.
Standard value: 20 - 24 Ω (at 20°C)
4.Using a new gasket, install the exhaust gas
recirculation valve by tightening its mounting
bolts to the specified torque.
Tightening Torque: 23 ± 6 N·m
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EXHAUST GAS RECIRCULATION VALVE (STEPPER MOTOR) CHECK Page 2 of 2
OPERATION CHECK
1.Remove the exhaust gas recirculation valve.
2.Attach a test wiring harness (special tool
MB991658) to the connector at the exhaust
gas recirculation valve.
3.
Connecting battery voltage
to the exhaust gas
caution
recirculation valve for a long
term could damage the coil.
Connect the positive (+) terminal of the battery
to terminal No. 2.
4.Connect terminals No. 1 and No. 3 to the
negative (-) terminal of the battery, in order to
test whether the stepper motor vibrates (with a
slight shudder), indicating that the stepper
motor is operating.
5.
Connecting battery voltage
to the exhaust gas
caution
recirculation valve for a long
term could damage the coil.
Connect the positive (+) terminal of the battery
to terminal No. 5.
6.Connect terminals No. 4 and No. 6 to the
negative (-) terminal of the battery, in order to
test whether the stepper motor vibrates (with a
slight shudder), indicating that the stepper
motor is operating.
7.If a vibration can be felt during the test, the
stepper motor is normal.
8.Using a new gasket, install the exhaust gas
recirculation valve by tightening its mounting
bolts to the specified torque.
Tightening torque: 23 ± 6 N·m
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