Filed Under (Jaguar) by admin on 23-05-2010
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Model: Jaguar XJ 1995 Complaint: The fault code P0172 is likely to be set due to the system being too rich. The fault code P0172 refers to injectors no’s 1 – 6. Remedy: Ensure the code P1111 has been logged after the service drive cycle has been completed. If this is not the case then go to step 6 of the test below. Check the harness and connectors to ensure they are in good condition and are reliable. If they are faulty then either repair or replace and go to step 6 of the test below. Disconnect the injector harness and go to step 1 of the test below if no faults are found. Test: • Check harness insulation PI 032/001 will complete a circuit to ground.
Filed Under (Vauxhall) by admin on 17-04-2010
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Fault
Caller reported to the helpline that the vehicle had developed a misfire under load, especially when the engine was hot. It was also mentioned that as the misfire occurred, the engine would suddenly appear to run on only 3 cylinders. The engine running on 3 cylinders would continue until the ignition was switched OFF. If the engine was re-started the engine would run on all 4 cylinders again until the misfire reoccurred under load, and then the engine once again appeared to be running on only 3 cylinders.
Cause
The initial misfire fault under load was finally traced to cylinder no 1 on the engine. The fault was caused by a poor output from the DIS ignition coil pack fitted to the vehicle. Upon testing the vehicle, it was discovered that when the misfire occurred on cylinder no 1, the Multec engine management ECM would switch OFF the fuel injector for the affected cylinder. The caller reported that when the engine was switched OFF and then restarted the misfire would disappear, and the fuel injector for cylinder no 1 would operate normally again
Filed Under (Renault) by admin on 17-04-2010
Tags: amp fuses,
blown fuse,
bonnet,
control modules,
diagnostic equipment,
ecm,
engine management,
flashing,
fuel injector,
fuel pump,
Renault,
renault megane,
rpm,
scale deflection,
temperature gauge,
warning light
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Fault
In conjunction with a poor starting problem on the vehicle, the helpline caller also reported a dim flashing of the SRS warning light (MIL), a half scale deflection of the temperature gauge, the rev counter reading 2000 rpm with engine stationary, all with no ignition HT spark, no fuel injector pulsing and no fuel pump operation.
Cause
Upon initial investigation using self diagnostic equipment, the caller was unable to communicate with the vehicle’s engine management or SRS system control modules. Eventually the fault was traced to an under bonnet blown fuse contained within an electrical box attached to the N/S suspension turret, next to the engine man ECM and relay. All four fuses within this box are 7.5 amp fuses
