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2000 xj will not start!?!?!!

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Old 09-11-2015, 09:08 AM
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Originally Posted by BruceB
The Electronic Control Module, or ECU as its commonly called, stores the information for your vehicle and your driving habits in its memory. The memory is maintaned by a series of capacitors that hold a charge and maintain power for the ECU when the vehicle is turned off. The following procedure will allow you to reset the memory and allow the computer to 're-learn' how to drive by adjusting to the drivers habits and the vehicles modifications. 1. Disconnect the battery by removing the positive battery cable. Remember, the positive battery cable. 2. Ground the positive cable to the negative cable for 30 seconds to erase the electric charge in the capacitors. 3. Reconnect the positive cable to the battery. 4. Turn the key to on but do not start. 5. Turn the headlights on. 6. Turn the headlights off. 7. Turn the key off. The ECU has now been reset to its factory settings. For the next 50 warm-up periods the ECU will re-learn the engine and driving habits for your driving conditions and the newly installed parts. Check for codes..
I did that reset after i installed that cam position sensor hoping it would clear everything out but nothing changed
Old 09-11-2015, 09:08 AM
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Originally Posted by CCKen
All those transmission codes may be an issue with the TPS. CodeP0122 is TPS voltage low. I would start by testing the TPS. Chart below shows the way. Use a safety pin to back probe the wires at the TPS connector. The P03XX codes are to do with no cam signal at the PCM and ignition coil primary circuit malfunctions (this could be a bad coil rail, which you can test as well). TPS tests: Coil Rail primary tests:
the tps and coil rail are both new. I'm so lost this is driving me crazy haha
Old 09-11-2015, 09:24 AM
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Originally Posted by zumer715
the tps and coil rail are both new. I'm so lost this is driving me crazy haha

Do the TPS tests anyway. The TPS may be new but the tests will tell you if the 5 volt reference voltage and the ground network voltage to the TPS are within spec. If either voltage is not within spec it could be affecting the cam sensor.
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