U010A Riley 4 Diagnostic Trouble Code
U010A Riley 4 code definition:
U010A is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code for Riley 4.
U010A Riley 4 is defined as Knock Sensor Circuit Range Performance (Bank 1 or Single Sensor). This refers to camshaft timing, which in this case is over-retarded. 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 U010A Riley 4 diagnostic trouble code may include:
- Blown fuse (if applicable)
- Engine surge
- Reduction in engine performance, especially at low RPM levels
- 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
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Possible Causes :
- Defective ECU strategies or components will prevent proper regeneration
- The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
- Dirty air cleaner element Damaged DPF
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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 :
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.
If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.
Process Tips
Diagnostic trouble code U010A Riley 4 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 U010A Riley 4.
Fortunately, U010A Riley 4 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
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