Now why was a code thrown? The ECM measures the resistance accross the harness wires. Check for yourself with the multimeter before replacing any plugs. Cylinders 1 & 2 were indicated as being bad, but actually it was plugs 3 & 4 that were bad. The last car I tested had 2 bad plugs according to the codes. For example, if the code specifies a bad plug at cylinder # 1, then cyl # 4 may be bad. I don't know if this is the case for all of them, but the ones I tested have the cylinder order backwards. NOTE: I have tested a few 2002's recently for glow plug problems. They have a 4 wire harness, so the ECM can specify the problem plug.But the trouble shooting procedure is the same for all codes. The other codes are just examples of codes you might find on a 2002 or newer car. They have a 2 wire glow plug harness, so just throw a generic code for the glow plugs. The first code is for 2001 and older cars. Several versions of the DTC areġ6764 / P0380 code (Glow plug/heater circuit electrical fault (Q6))ġ7055 / P0671 code (Cylinder 1 Glow plug circuit (Q10))ġ7056 / P0672 code (Cylinder 2 Glow plug circuit (Q11))ġ7057 / P0673 code (Cylinder 3 Glow plug circuit (Q12))ġ7058 / P0674 code (Cylinder 4 Glow plug circuit (Q13)) The glow plug codes are a popular code to be thrown on our cars.
I just got the code back so I had to do the testing procedure again and thought I would redo my How to with new pics & info.
Well, its been over a year since my original glow plugs 101 thread.
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