cel does not light up
One side of the CEL lamp should have battery voltage whenever the key is turned on. You can check that with your test light.
The PCM switches "on" the ground side of that lamp circuit when it wants to light up the CEL.
So if you connect your test light between one side of the lamp & ground, the test lamp will light up. Connect from the other side to ground, and the CEL along with your test light will both light up dimly. That's how it should work if the supply side of the circuit is OK.
The PCM switches "on" the ground side of that lamp circuit when it wants to light up the CEL.
So if you connect your test light between one side of the lamp & ground, the test lamp will light up. Connect from the other side to ground, and the CEL along with your test light will both light up dimly. That's how it should work if the supply side of the circuit is OK.
If you have piece of wire, you can ground pin A18 with the key in the II position. You can use a bare metal bolt for the ground. The check engine light should turn on.
The volt meter method would help identify where you are missing voltage or ground. The test light should work to verify voltage to a wire.
It will probably be easier to test at the PCM connection.
The volt meter method would help identify where you are missing voltage or ground. The test light should work to verify voltage to a wire.
It will probably be easier to test at the PCM connection.
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