U0142 Renault 30 Diagnostic Trouble Code
U0142 Renault 30 code definition:
U0142 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code for Renault 30.
U0142 Renault 30 is described as Fuel System Too Rich, which basically means bank 1's oxygen sensor has detected a rich condition of fuel. This means there's not enough oxygen in the exhaust from too much fuel being delivered into the air and gas mixture for combusion. There are two wires dedicated for each coil; one is battery feed which usually comes from the distribution center, and the other one for the coil driver circuit from the PCM. The PCM grounds or ungrounds the circuit to activate or deactivate the coil.
Symptoms
Symptoms of a U0142 Renault 30 diagnostic trouble code may include:
- The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
- Faulty or damaged wiring
- Hesitation upon acceleration
- The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
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Possible Causes :
- An air leak forward of the DPF will change the sensor readings resulting in the code
- Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
- Defective ECU strategies or components will prevent proper regeneration
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Common Misdiagnoses
- Control Module Throttle Actuator Position Performance Problem
- Air Conditioning (A/C) Clutch Feedback Circuit High Voltage Problem
- Cruise Vehicle Speed/Set Speed Difference Too High Problem
- Kick-Down Switch Failed Short Problem
- Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit Problem
Repair Processes :
Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.
With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.
Look at the plug wires to make sure they are not burnt or laying on the exhaust.
Process Tips
Diagnostic trouble code U0142 Renault 30 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.
Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before U0142 Renault 30.
Fortunately, U0142 Renault 30 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
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