Description:

This error code, ECU 000676.31, is set when the ECU detects that the cold start aid relay output voltage is low even though the ECU has energized the relay. This condition indicates a problem such as an open circuit at the glow plug relay, a defective relay, or a wiring issue.

Reaction:

The ECU may limit or disable the starting aid function, resulting in difficulty starting the engine, especially in cold weather.

Recommendations:

• Inspect Relay and Wiring: Check the cold start aid relay and its wiring for signs of damage, disconnections, or corrosion that could cause an open circuit.
• Measure Circuit Continuity: Use a multimeter to measure continuity in the relay circuit to identify any breaks or high resistance points.
• Test Relay Functionality: Verify that the relay activates when the ECU sends the signal. If the relay does not respond, it may be defective.
• Replace Faulty Components: Replace any damaged wiring or a faulty relay to restore the correct circuit operation.
• Reset ECU and Conduct System Tests: After repairs, reset the ECU and test the starting aid system to ensure the relay functions correctly and the error code is cleared.

Note:

Ensuring the cold start aid relay operates correctly is essential for reliable engine starting. Regular maintenance and timely diagnostics can help prevent starting issues, particularly in cold conditions.