[17] ENGINE AND EMISSION CONTROL - - EMISSION CONTROL <MPI> - EXHAUST GAS RECIRCULATION (EGR) SYSTEM - EGR VALVE (STEPPER MOTOR) CHECK <4G69> | PRINT PAGE / INDEX / PRIOR / NEXT

| EGR VALVE (STEPPER MOTOR) CHECK <4G69>
| Checking the Operation Sound
| Check that the operation sound of the stepper motor can be heard from the EGR valve when the ignition switch is turned ON (without starting the engine). If the operation sound cannot be heard, inspect the drive circuit of the stepper motor. NOTE: If the circuit is normal, either the stepper motor or the engine-A/T-ECU may have failed.
| Checking the Coil Resistance
| Remove the EGR valve. Measure the resistance between terminal No. 2 and either terminal No. 1 or terminal No. 3 of the connector at the EGR valve. Standard value: 20 - 24 Ω (at 20°C) Measure the resistance between terminal No. 5 and either terminal No. 6 or terminal No. 4 of the connector at the EGR valve. Standard value: 20 - 24 Ω (at 20°C) Using a new gasket, install the EGR valve by tightening its mounting bolts to the specified torque. Tightening Torque: 24 ± 4 N·m
| Operation Check
| Remove the EGR valve. Attach a test wiring harness (special tool MB991658) to the connector at the EGR valve.
| CAUTION Connecting battery voltage to the EGR valve for a long term could damage the coil. Connect the positive (+) terminal of the battery to terminal No. 2. 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. CAUTION Connecting battery voltage to the EGR valve for a long term could damage the coil.
| Connect the positive (+) terminal of the battery to terminal No. 5. 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. If a vibration can be felt during the test, the stepper motor is normal. Using a new gasket, install the EGR valve by tightening its mounting bolts to the specified torque. Tightening torque: 24 ± 3 N·m
| Cleaning the EGR Valve CAUTION Do not use a solvent or detergent, which could enter the motor and cause it to malfunction. Remove the EGR valve and check that the EGR valve is not stuck or clogged with carbon deposits. Use a wire brush to clean the valve if necessary. Using a new gasket, install the EGR valve by tightening its mounting bolts to the specified torque. Tightening torque: 24 ± 3 N·m

[17] ENGINE AND EMISSION CONTROL - - EMISSION CONTROL <MPI> - EXHAUST GAS RECIRCULATION (EGR) SYSTEM - EGR VALVE (STEPPER MOTOR) CHECK <4G69> | PRINT PAGE / INDEX / PRIOR / NEXT

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