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Ecu Code 13 - Oxygen Sensor Circuit

  1. Inspect O2 sensor wiring and connectors. Correct any problem and clear trouble code. Start engine and run at 2500 RPM until normal operating temperature. Access trouble codes. If trouble code is still present, clear code.
  2. Disconnect O2 sensor and apply 1.5 volts to ECU. Start engine and run at 2500 RPM for 2 minutes. Access trouble code. If code 13 does not exist, replace O2 sensor.
  3. If trouble code 13 is present, check continuity between ECU harness connector terminal No. 30 (No. 27 on Pickup and Trooper II) and O2 sensor connector. If continuity does not exist, repair or replace harness. If continuity exists, replace ECU. Clear codes and run engine for 2 minutes. Access codes to ensure code 13 is not present.
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