Description:

This error code, ECU 000676.05, is set when the ECU detects no output signal from the glow plug relay despite energizing the relay supply lead. This condition indicates a circuit problem, such as an open circuit at the glow plug relay or a defective relay (K02/01). The ECU uses manifold air temperature to determine the duration of power supply to the glow plugs.

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