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Motor Position Sensor (1.8L)

  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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