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Knock Control System (323 Turbo)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1989 Mazda MX-6, 1989 Mazda MPV, 1989 Mazda B2600i, 1989 Mazda B2200, and 1989 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
  1. With engine at normal operating temperature, check ignition timing. Ensure voltage at ECU connector terminal No. 1U is approximately 12 volts.
  2. Disconnect single wire service connector at ECU. Tap engine hanger and note ignition timing. If timing does not retard, replace knock sensor and retest.
  3. If timing retards, connect single wire service connector and retest. If timing retards, replace knock control unit. If timing does not, system is okay.
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