Begin by disconnecting wiring to the #2 cylinder glow plug, and placing the DVOM on ohms before touching the red lead to the glow plugs empty terminal and grounding the black lead. The range must be .5 to 2.0 ohms. Next, the mechanic must consider resistance in the glow plug wire and the relay buss bar on the valve cover.
The relay number that has been replaced with a new item was the 471 relay. Looking at the Audi Workshop Manual, I cannot identify where the j179 glow plug period control unit is. I would think that this is the faulty unit. The 179 would feed the 471 to supply voltage to the heater plugs. Any a2 enthusiasts aware of where the 179 is, and it’s
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glow plugs: 60/80: F3: Automatic transmission control system (6-speed automatic transmission / Multitronic) 15: F4: glow plugs: 60: 1: Fuel pump relay: 2: Transmission control relay (Multitronic) 3: Glow plug relay: 4: Engine management relay: 5: Start Inhibit Switch Relay/Reversing Lamp Relay (Multitronic) Petrol engines
How can I find and positively identify the glow plug relay in this car? The glow plugs have all been renewed. The pre-heating indicator used to come on for a very short period and now does not come on at all and the engine will not start in this cold weather. Any tips on getting the engine started so that I can take the car to a service shop?
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audi q7 glow plug relay location
