If the harness checks out OK, replace the hall effect sensor inside the distributor and retest. If there is no square wave on either wire, check both wires for shorts to power or ground.
At the distributor, verify that the Dark Blue (DB) wire and the Yellow/Light Green (Y/LG) wire have good battery voltage square wave while cranking the engine over. Verify that the Black/White (BK/WH) wire at the distributor and the TFI has a good ground. If OK, verify that the Red/Light Green (R/LG) wire that supplies battery voltage to the TFI and the distributor is maintaining good battery voltage. Disconnect the PCM and the Thick Film Ignition Module (TFI), and check the Yellow/Light Green (Y/LG) wire for a short to power or ground. Verify V-REF (5-volt reference voltage) on the Brown/White (BR/WH) wire at the Throttle Position Sensor (TPS) as the problem occurs. Pull codes from Powertrain Control Module (PCM) to verify communication.
I will be more readily available from now on if you need to get back to me.ġ. I'm thinking it is a ground problem, a faulty replacement part (ign module or crank sensor) or a problem with the PCM. Hey there I'm really sorry it's taken me so long to get back.
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