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Motor Position Sensor (1.8L)

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  1. Motor position sensor is integral with idle speed control servo, located on throttle body. Disconnect motor position sensor connector. Using an ohmmeter, measure resistance between motor position sensor terminals No. 1 and 3. Ohmmeter should read 4000-6000 ohms. See Fig 1 .
  2. If resistance is not within specification, replace idle speed control servo. If resistance is within specification, go to next step.
  3. Disconnect idle speed control servo connector. Connect a 6-volt power source between idle speed control servo terminals No. 1 and No. 2 to activate idle speed control servo plunger. See Figure .
  4. Using an ohmmeter, measure resistance between motor position sensor terminals No. 1 and 2 when idle speed control servo plunger is activated. Ohmmeter should read 4000-6000 ohms.
  5. Replace idle speed control servo if resistance is not within specification, or if there is not a smooth extension and retraction of idle speed control servo plunger.
    Fig 1: Motor Position Sensor Terminal Identification (1.8L)
    G90B06286Courtesy of DAIMLERCHRYSLER CORP.
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