How to Deal with Auman Post-Processing Wiring Harness Malfunction?
2 Answers
Check the wiring for issues. Look for loose connections, oxidation, or broken sections, as these can all trigger wiring faults. Below are relevant explanations: 1. Ignition system failure: The ignition coil is malfunctioning, resulting in weak or no high-voltage spark; ignition device failure; incorrect ignition timing. 2. Fuel injection system failure: No fuel in the tank; the fuel pump is not working or has low pumping pressure; fuel pipe leakage or deformation; circuit relay disconnection; fuel pressure regulator malfunction; excessively dirty fuel filter. 3. Intake system failure: Idle control valve or its control circuit malfunction; idle control valve air pipe rupture or connection leakage; air flow meter failure.
When encountering abnormal wiring harness in the Auman aftertreatment system, I recommend first observing the vehicle's condition, such as white smoke from the exhaust pipe or sudden power loss, which are typical signs. After turning off the engine, open the hood and focus on checking for loose connections or water ingress in the wiring harness connectors, especially around the urea nozzle plug. If you find damaged wire insulation, avoid attempting DIY repairs—professional wiring requires waterproof and high-temperature-resistant treatment. If possible, use a diagnostic scanner to read the fault codes, which can quickly identify whether the issue lies with the urea pump or the oxygen sensor. Remember the tip the service station gave me last time: wiring harness issues often come with recurring error codes, and the only permanent solution is to replace the entire aged harness section—otherwise, speed limitations on the road can be dangerous. During routine maintenance, pay extra attention to the wiring harness bundling locations to prevent brittleness from exposure to high-temperature components.
