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90 240 Crank Position Sensor - OBD Not flashing 200

posted by  malloy1 on  Sat Jun 27 10:57 CST 2020
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last visit: Sun Oct 12 17:44 CST 2014
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OK-Yesterday I was driving home from an appointment, and the car just died. I did a quick check, no fuel pump (fuel pump relay not clicking during cranking-jumpered the fuel pump fuse and got the pumps running) and no spark (explains fuel pump relay not activating).

I figured it was the CPS since it's original (195K on the car). Also, I assume the car will start after it sat for a while if it was the CPS.

Towed the car home (only 5 blocks away from home).

So, as I waited for the car to cool down, I checked the OBD system. Both in pin #2 (fuel) and #6 (ignition). The LED lit up when I pushed the test button, but the system didn't give back any code flashes. I assume it was because the pins were dirty or corroded. Cleaned everything, still no code flashes.


I figured it was either a OBD box or something to do with the CPS.

I unplugged the CPS plug on the firewall and checked the resistance of the three pins. I got about 200 ohms between two pins (didn't bother to figure out which pins) and nothing between the other pins. The resistance between the two pins that gave a value would only read a value for a few seconds, than nothing. Have a new CPS ordered and will replace as soon as possible.

Well, after a couple of hours sitting, the car started right up. I checked the codes again, and the OBD system gave me codes for both ignition and fuel systems. Ignition gave me 1-1-1 - no faults detected, and fuel gave me 1-2-1 - faulty AMM (which I replaced and the code went to 1-1-1).

Question: Has anybody else seen no codes flashing in the OBD system when the CPS is going/went bad? Or is this a something else (like a sign of a bad ECU)?

Paul






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