Description:

The ECU 000029.04 (29.04) error code indicates that the secondary throttle signal 3 on John Deere equipment is below the low voltage threshold for this sensor. Causes can include a faulty throttle sensor, degraded wiring, or poor electrical connections that result in a reduced voltage signal.

Reaction:

The engine control system may trigger a safety mode to reduce engine power, effectively preventing any unpredictable or insufficient throttle response that could compromise safety or engine performance.

Recommendations:

• Check Sensor and Electrical Connections: Carefully inspect the throttle sensor and all electrical connections for wear or damage that could result in low voltage signals.
• Measure Sensor Output: Use diagnostic tools to check the output from the throttle sensor to confirm that it falls within the expected range.
• Repair or Replace Damaged Components: Any damaged components should be repaired or replaced with original John Deere parts to restore normal operation.
• Reset and Test the System: After repair or replacement, reset the engine control system and thoroughly test the throttle to ensure it responds appropriately across all ranges.

Note:

For ECU 000029.04, be aware that low signal issues may also indicate broader system voltage problems, such as issues with the vehicle’s battery or alternator. Regular system-wide voltage checks can prevent misdiagnoses and ensure the throttle sensor receives the correct power supply.