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Test Drive Relearn Procedure

NOTE: When voltage supply to ECM is interrupted or codes have been cleared, ECM loses all "learned" and/or "basic" values. Serious driveability problems may occur depending on vehicle mileage. A relearn procedure must be performed.
  1. If ECM was disconnected during diagnostic procedure or codes have been cleared, go to next step. If ECM was not disconnected during diagnostic procedure and no codes are present. Perform a test drive. Recheck for codes (no relearn procedure is necessary).
  2. Turn ignition off. Remove test equipment. Reconnect ECM connector. Reconnect all remaining (disconnected) electrical connectors/components. Go to next step.
    NOTE: Throttle Valve Control Module (J338) adapts to ECM (J220) automatically if ignition is switched on for 10 seconds or more without operating accelerator pedal or starter and ECM recognizes a need for adaptation. No notification that adaptation was successful will be given when this happens.
  3. Turn ignition on for a minimum of 10 seconds. Turn ignition off. Perform idle check, see IDLE CHECK  . Perform a long road test. Coolant temperature needs to be greater than 176°F (80°C). Idle, partial throttle, full throttle and overdrive, all must be attained several times. During test drive, apply full throttle until engine speed exceeds 3500 RPM. Read readiness code. Generate readiness code if necessary. See READINESS CODE  .
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