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Preparation For Checks

NOTE: The frequency valve is operated by pulsating voltage from the electronic control unit. By measuring this signal, certain functions of the system can be tested. A special tester (Bosch KDJE 7453) is recommended, but a high-quality dwell meter may be used instead. A voltmeter is used for Mercedes-Benz.
  1. Connect dwell meter to testing connector. Connector is located on left side near windshield washer container on Peugeot, beside brake booster on Volvo, and to left of fuse and relay panel on Saab. Connector is behind throttle valve housing on Volkswagen and Audi. Set meter on 4-cyl. scale.
  2. On Mercedes-Benz, remove cap from diagnostic plug connector (rear of left fender panel). Connect positive lead of voltmeter to battery and negative lead to pin 3 of diagnostic plug.
  3. Start engine and run until warm. Disconnect oxygen sensor and observe meter needle (should not fluctuate). Place a piece of tape on meter face to indicate 50% position.
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