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MPI - On-vehicle Service 13A-139 Checking the Coil Resistance 2. Measure the resistance between terminal No. 2 and either terminal No. 1 or terminal No. 3 of the connector at the idle speed control servo side. 3. Measure the resistance between terminal No. 5 and either terminal No. 6 or terminal No. 4 of the connector at the idle speed control servo side. Operation Check 2. Remove the stepper motor. 3. Connect the special tool (test harness: MB991709) to the idle speed control servo connector. 4. Connect the positive (+) terminal of a power supply (approximately 6 V) to the terminals No. 2 and No. 5. 5. With the idle speed control servo as shown in the illustration, connect the negative (-) terminal of the power supply to each clip as described in the following steps, and check whether or not a vibrating feeling (a feeling of very slight vibration of the stepper motor) is generated as a result of the activation of the stepper motor. (1) Connect the negative (-) terminal of the power supply to the terminals No. 1 and No. 4. (2) Connect the negative (-) terminal of the power supply to the terminals No. 3 and No. 4. (3) Connect the negative (-) terminal of the power supply to the terminals No. 3 and No. 6. (4) Connect the negative (-) terminal of the power supply to the terminals No. 1 and No. 6 (5) Connect the negative (-) terminal of the power supply to the terminals No. 1 and No. 4. (6) Repeat the tests in sequence from (5) to (1). 6. If, as a result of these tests, vibration is detected, the stepper motor can be considered to be normal. |