What Causes the Exhaust Controller Malfunction Light to Illuminate?
1 Answers
The reasons for the exhaust controller malfunction light to illuminate are: code fault, intake pressure sensor failure, and oxygen sensor failure. Code fault: A fault code is reported, but the system operates normally. This may be due to an operation exceeding the computer's control range, resulting in a feedback fault code that can be cleared initially. Solution: When a fault occurs in the car engine, the computer detects it and displays a fault code. Using this code, maintenance personnel can accurately locate the faulty component and proceed with repairs. Intake pressure sensor failure: Based on computer detection information and further inspections, a certain fault is identified that does not significantly affect normal driving or has minimal impact, indicating an intake pressure sensor failure that requires timely detection and resolution. Solution: Disconnect the intake manifold pressure sensor's wiring harness plug, then turn on the ignition switch without starting the engine. Use a voltmeter to measure the voltage between the power terminal and the ground terminal on the wiring harness plug. The value should comply with specifications; otherwise, further inspection is needed to ensure the circuit between the intake manifold pressure sensor and the electronic control unit is conducting. If there is a break, replace or repair the electronic control circuit wiring harness. Oxygen sensor failure: Severe impact on the engine's normal operation is felt during driving, indicating an oxygen sensor issue that requires immediate repair. Solution: Pay attention to fuel quality, check if the spark plugs and ignition coil's operating voltage is normal, and ensure the three-way catalytic converter is functioning properly without any blockages.
