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  #1  
Old 09-14-2013, 01:30 PM
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No start condition. Cam Position Sensor indicated.

1999 Jeep Grand Cherokee Limited. 4.7 v8. 240000 miles+. Jeep started missing towing a light trailer up a grade, engine was heating but not to redline. Stopped and shut off then could not get a restart. Fuel pump runs and has pressure at the fuel rail. Cranks but sounds to be loading. Fault code indicates Cam Position Sensor P3040. I replaced the sensor and confirmed 5v power at the connector as well as a good ground and no shorts indicated. Secondary problem not likely related is failed harness in the drivers door. Any help???
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Old 09-14-2013, 04:31 PM
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Re: No start condition. Cam Position Sensor indicated.

Did you measure the continuity of all the three wires from the CPS? Already removed and inspected the PCM connectors?
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Old 09-14-2013, 04:45 PM
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Re: No start condition. Cam Position Sensor indicated.

Is the PCM connector in the engine compartment, passenger side, next to the firewall? I cannot get it apart to check if that is the correct connection. Removed red lock tab and tried everything but breaking it. Once open, which pins correspond to the cam sensor wires, I do not have the wiring diagram. Also, is there any chance that the Crank Position Sensor may be involved even though it is not throwing that code? Code shown consistently is P0340.
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Old 09-14-2013, 05:10 PM
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Re: No start condition. Cam Position Sensor indicated.

The PCM has 3 connectors on it. It sits in the engine bay on the aft bulkhead close to the right fender (as seen from drivers position).
Disconnect negative battery terminal before removing any PCM connector.
Some googling showed that a bad battery or even a bad starter can cause this fault code to pop up. How is the batt voltage? Do you have a charger to charge it completely?
Attached Files
File Type: pdf PCM.pdf (119.9 KB, 7 views)
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Old 09-15-2013, 06:34 AM
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Re: No start condition. Cam Position Sensor indicated.

What pin corresponds to the CPS return wire? Battery is fully charged and cranks starter as it should. Engine sounds to me as if it is not hitting in proper time which would seem to validate code fault. I will check PCM connections this AM. Thanks for the help!
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Old 09-15-2013, 09:55 AM
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Re: No start condition. Cam Position Sensor indicated.

Here is the wiring schematic for the 1999 WJ cam sensor.
Attached Files
File Type: pdf Cam sensor.pdf (119.7 KB, 8 views)
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Old 09-15-2013, 12:44 PM
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Re: No start condition. Cam Position Sensor indicated.

Thanks, I will be back on it this afternoon.
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Old 09-16-2013, 02:35 PM
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Re: No start condition. Cam Position Sensor indicated.

Wires from the PCM check out OK. Still getting JUST the cam sensor fault. Thinking about trying another sensor just in case it was bad out of the box (stranger things have happened). What might be my next move? I really can not afford to replace the ECM without knowing that is the problem. Anyone have ANY other thoughts? I am going into my second day of missing work now.
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Old 09-16-2013, 11:35 PM
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Re: No start condition. Cam Position Sensor indicated.

Sometimes non OEM sensors can cause problems, but wonder if it would be the case here. There should be a possibility to measure the cam sensor, just google this first.
Crank sensor would give the same problem, but since you don't have any code from that one, i would not suspect it. Does the tachometer show rotation when trying to start? If yes, then the crank sensor should be ok.
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Old 09-17-2013, 07:17 AM
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Re: No start condition. Cam Position Sensor indicated.

Good tip. I will see if it is registering.
****Cranking engine does NOT indicate anything on the tach gauge. Guess I will pull the starter and install a new crank sensor this morning.
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Old 09-17-2013, 11:28 AM
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Re: No start condition. Cam Position Sensor indicated.

Tried new crank sensor. No luck. Same no start condition, still throws a cam position sensor fault. Going to try another cam sensor in the off chance that the first one was bad out of the box. Don't know where to go after that.
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Old 09-17-2013, 03:12 PM
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Re: No start condition. Cam Position Sensor indicated.

If the second cam sensor gives the same result, then there is not that much left what can be wrong. Did you use Mopar sensor?
Did you measure all 3 CPS wiring to ground as well, to be sure that its not a wire insulation problem?
Further then that, i can only come up with the PCM, or a mechanical problem inside the engine. I have never tried it, but if its possible to see the cam sensor target wheel through the cam sensor hole (with a small mirror and flashlight), you could see if the target wheel is turning when you turn the crankshaft by hand. You can put a large socket on the vibration damper bolt and turn it clockwise. Then at least you are sure that the target wheel is not loose or any other mechanical problem prevents it from turning.
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