My glow plug light dose not come on, only when i keep on switch it on and off for about 4 mins then it starts the oil presser light starts flashing and then when i switch the ignition off i still runs for about 2 mins. what is the problem?
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Re: my v.w glof glow light dose not come on?
Most likely ignition switch has gone bad. Don't need to worry about oil pressure light IF the motor is not running, but IF it IS running, shut down motor immediately until oil pressure can be verified with an external gauge.
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This is caused by burnt out glow plugs, when the glow plugs fail it changes the resistance so the glow plug controller/timer doesn't cycle properly, it is the same as when a turn signal bulb burns out.
Your diesel vehicle is equipped with glow plugs, and also with a Glow Plug Light that will either come on and stay on, or flash or blink when a fault is detected by the ECU (engine management unit). When the Glow Plug Light comes on, the ECU stores information about the condition that has caused it to come on.4 Jan 2016
The code P0674 tells you that something in the glow plug circuit is faulty causing the glow plug on cylinder #4 to fail to heat up. The entire circuit must be checked to locate the fault.
Symptoms With just one glow plug failure other than the check engine light coming on, the symptoms will be minimal since the engine will normally start with one bad plug, under freezing conditions you would be more likely to experience hard starting.
Potential Causes The causes for this DTC may include: Faulty cylinder #4 glow plug Open or shorted glow plug circuit Damaged wiring connector Faulty glow plug control module Diagnostic Steps & Possible Solutions You will need a digital volt ohm meter (DVOM) for the complete test.
Continue through the tests until the problem is confirmed. You will also need a basic OBD code scanner to reset the computer and erase the code. Check the cylinder #4 glow plug by disconnecting the wire connector on the plug. Place the DVOM on ohms and place the red lead on the glow plug terminal and the black lead on a good ground. The range is .5 to 2.0 ohms, if it is out of range replace the glow plug.