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Diagnostic Procedure

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  1. Ensure ignition is off. Access ECM. See Figure-Figure . Disconnect appropriate ECM harness connector. Using DVOM, measure resistance between terminals SP2+ and SP2- at appropriate ECM harness connector. See PIN VOLTAGE TESTS . Resistance should be 560-680 ohms. If resistance is as specified, replace ECM and retest. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If resistance is not within specification, go to next step.
  2. Remove No. 2 vehicle speed sensor from transmission. See Fig 1. Measure resistance between sensor terminals. Resistance should be 560-680 ohms. If resistance is not as specified, replace sensor. If resistance is as specified, check and repair circuits between sensor and ECM harness connector.
  3. Check voltage between sensor terminals when a magnet is put close to tip of speed sensor. See Figure. If a low intermittent voltage is generated, sensor is okay. If no voltage is generated, replace speed sensor.
Fig 1: Locating No. 2 Vehicle Speed Sensor
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