Question about 2004 Jeep Grand Cherokee

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Engine turns over, no start. Camshaft Sensor and CKT Sensor replaced

Engine turns over will not start. No fire, No pulse to injectors, have 5 volt to camshaft sensor. Replaced the camshaft sensor & the crankshaft sensor and the veh ran fine for 9 days. Now same problem.

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  • Jeep Master
  • 21,873 Answers

I would check the computer for trouble codes first.
Could be a problem in the wiring harness, or one of the components the cam and crank sensors "reads".
And of course you could have gotten a faulty part.
You might be able to take a meter and check each sensor while still on the engine.

Posted on Dec 12, 2012

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Posted on Jan 02, 2017

  • 92 Answers

SOURCE: 2 problems with 1999 jeep cherokee sport 4x4

ox. sensor no. 1 check exhaust pipe below exhast manifold

Posted on Oct 06, 2008

chryslertech
  • 115 Answers

SOURCE: remove the camshaft position sensor from my 1999 jeepcherokee

The Camshaft Position Sensor (CMP) on the 4.7L V - 8 engine is bolted to the front side of the right cylinder head. Disconnect the sensors connector. Take out the bolt that holds the sensor in place. Lightly pry out the sensor being careful not to break it. Clean out the hole and install the new sensor( put a little oil on the new sensors o-ring to help installation).

Posted on Feb 27, 2009

crayzeetrayn
  • 837 Answers

SOURCE: 2001 Jeep Grand Cherokee code P1391

I would check to be sure that the timing chain hasn't jumped at all ..

Posted on Mar 25, 2009

roniecon
  • 6826 Answers

SOURCE: No fire to coil from coil on 96 model Jeep Grand Cherokee.

You need to put the harmonic balance for the 96 jeep on this motor,then put the crankshaft sensor on for the 96 jeep on the vehicle,this should fix you up.The crankshaft sensor and the harmonic balance have to go together.If I can be further help,let me know.>>roniecon@gmail.com

Posted on Aug 18, 2009

Testimonial: "Roniecon was extremely helpful trying to solve this problem, he hung in there to the very end. He spent a lot of time researching the problem. THANKS"

wracefans24
  • 1985 Answers

SOURCE: 99 Jeep Cherokee Sport, 4.0L -won't start

you need to have it connected to an OBD2 machine and watch if you are missing the cam sensor showing RPMs
or if your missing crank sensors RPMs,
it could be a wiring problem or computer if your seeing the RPMs from both sensors,and the last thing i would check is hooking up a fuel gauge to the reed valve and watch what fuel pressure you have while cranking,if the cam sensor is the culprit it will turn the fuel off after the cranking.

Posted on Jan 12, 2010

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06 Pontiac G6 2.4 I replaced the motor, started right up and ran great. Shut it off, now it won't start. I have no spark, and codes, po366 and po341 showed up. What's common to these 2 sensors?


DTC P0340: Intake CMP Sensor Circuit
DTC P0341: Intake Camshaft Position (CMP) Sensor Performance
DTC P0365: Exhaust Camshaft Position (CMP) Sensor Circuit
DTC P0366: Exhaust Camshaft Position (CMP) Sensor Performance

The five volt reference circuit .

The 4X camshaft position (CMP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit, and an output signal circuit. The CMP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the CMP sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the CMP sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses CMP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.
Do you know what the five volt reference circuit is .

How to check the 5v reference circuit for short to ground Cadillac

Mar 17, 2017 | Pontiac Cars & Trucks

1 Answer

P0340 code


DTC P0340: Camshaft Position (CMP) Sensor Circuit
P0340 ?€¢
The ECM detects that the starter is commanded on and the engine has been cranking for more than 4 seconds without a CMP sensor pulse.


OR


?€¢
The ECM detects that the engine has started, but did not received a CMP sensor pulse during the first engine revolution.


OR


?€¢
The ECM detects that the engine is running, but does not receive a CMP sensor pulse for 800 of 1,000 engine cycles.


The 4X camshaft position (CMP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit, and an output signal circuit. The CMP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the CMP sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the CMP sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses CMP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home operation.
You need a cam sensor or have wiring problem !

Apr 30, 2015 | Cars & Trucks

1 Answer

Where is the cam sensor at



Description & Operation

2.5L Engines
On the 2.5L 4cylinder engine the Camshaft Position (CMP) sensor is located in the distributor.
The sensor contains a Hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects a rotating pulse ring (shutter) on the distributor shaft. The pulse ring rotates 180 degrees through the sync signal generator. Its signal is used in conjunction with the Crankshaft Position (CKP) sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders.
When the leading edge of the pulse ring (shutter) enters the sync signal generator, the following occurs: The interruption of magnetic field causes the voltage to switch high resulting in a sync signal of approximately 5 volts. When the trailing edge of the pulse ring (shutter) leaves the sync signal generator, the following occurs: The change of the magnetic field causes the sync signal voltage to switch low to 0 volts. 4.0L

The Camshaft Position Sensor (CMP) on the 4.0L 6cylinder engine is bolted to the top of the oil pump drive shaft assembly. The sensor and drive shaft assembly is located on the right side of the engine near the oil filter.
The CMP sensor contains a Hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects a rotating pulse ring (shutter) on the oil pump drive shaft. The pulse ring rotates 180 degrees through the sync signal generator. Its signal is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders.
When the leading edge of the pulse ring (shutter) enters the sync signal generator, the following occurs: The interruption of magnetic field causes the voltage to switch high resulting in a sync signal of approximately 5 volts.
When the trailing edge of th4.7L

The Camshaft Position Sensor (CMP) on the 4.7L V8 engine is bolted to the front/top of the right cylinder head.
The CMP sensor contains a Hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects notches located on a tone wheel. The tone wheel is located at the front of the camshaft for the right cylinder head. As the tone wheel rotates, the notches pass through the sync signal generator. The pattern of the notches (viewed counter-clockwise from front of engine) is: 1 notch, 2 notches, 3 notches, 3 notches, 2 notches 1 notch, 3 notches and 1 notch. The signal from 5.7L V8 Engines

The Camshaft Position Sensor (CMP) on the 5.7L V-8 engine is located below the generator on the timing chain / case cover on the right/front side of engine.

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Fig.

The CMP sensor is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders. The sensor generates electrical pulses. These pulses (signals) are sent to the Powertrain Control Module (PCM). The PCM will then determine crankshaft position from both the camshaft position sensor and crankshaft position sensor.
The tone wheel is located at the front of the camshaft (2). As the tone wheel rotates, notches (3) pass through the sync signal generator.
When the cam gear is rotating, the sensor will detect the notches. Input voltage from the sensor to the PCM will then switch from a low (approximately 0.3 volts) to a high (approximately 5 volts). When the sensor detects a notch has passed, the input voltage switches back low to approximately 0.3 voltsthe CMP sensor is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinderse pulse ring (shutter) leaves the sync signal generator, the following occurs: The change of the magnetic field causes the sync signal voltage to switch low to 0 volts

Jun 08, 2012 | 1999 Jeep Grand Cherokee

1 Answer

Where is the cam sensor on a 2005 dodge neon sxt 2.0


Camshaft Position Sensor-On top of engine Operation The Engine Management System (EMS) uses the camshaft position sensor to manage sequential fuel injection and as part of misfire diagnosis. The EMS constantly monitors the number of pulses on the signal circuit. The EMS compares the number of camshaft sensor reference pulses and the number of crankshaft position sensor reference pulses received. If the EMS receives an incorrect number of pulses, Diagnostic Trouble Codes (DTCs) should be stored in the EMS. Some engine management systems will then default to multi-port or "gang-fire" injector operation. The camshaft position sensor signal is required to sequence the injector operation to the proper cylinder timing. If the camshaft position sensor or circuit is faulty, most engines will start. However, the EMS misfire diagnostic will likely be affected.
The following symptoms can be caused by an intermittent wiring connections or faulty signal to the EMS.
Related Symptoms
  • Extended crank time with a cold engine
  • Intermittent rough running
  • Unstable idle
  • Bucking
  • Hesitation
  • Stumble
  • Chuggle
  • Poor fuel economy
  • Stalling on acceleration
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Aug 05, 2010 | 2005 Dodge Neon

1 Answer

I have a 2000 dodge ram with the 5.9 engine is not getting fire.i have replaced coil,cap,rotor button,and wires. possibly an ecm prob?


check the camshaft position sensor inside the distributor. remove the distributor cap. take a volt meter and use either a paper clip or a small pin to insert into the back of the distributor connector (yellow wire). connect the positive side of voltmeter to yellow wire. rotate engine with starter until the rotor is pointed toward the rear of vehicle. with the ignition on( engine not running) the voltmeter should say 5 volts. if there is no voltage check the voltage on supply wire . with the key on there should be approximately 8.0 volts. if voltage is presant, install the probes of the voltmeter into the signal wire (tan/yellow) and crank the engine over to observe the voltage reading. the meter should read 5.0 volts indicating that the ignition signal is pulsing properly. if the camshaft sensor fails either test (replace it).

Apr 24, 2010 | 2000 Dodge Ram 1500 Truck

1 Answer

Engine light is on...


P0137--O2 Sensor Circuit Low Voltage-Bank 1 Sensor 2

P0139--O2 Sensor Circuit Slow Response-Bank 1 Sensor 2

P0152--O2 Sensor Circuit High Voltage-Bank 2 Sensor 1

P0300--Random Multiple Cylinder Misfire


I would suspect that the camshaft position sensor is bad. This is a quote from the tech manual:

The Powertrain Control Module (PCM) uses the camshaft position sensor to manage sequential fuel injection and as part of misfire diagnosis. The PCM constantly monitors the number of pulses on the signal circuit. The PCM compares the number of camshaft sensor reference pulses and the number of crankshaft position sensor reference pulses received. If the PCM receives an incorrect number of pulses, Diagnostic Trouble Codes (DTCs) should be stored in the PCM. Some PCM systems will then default to multi-port or "gang-fire" injector operation. The camshaft position sensor signal is required to sequence the injector operation to the proper cylinder timing. If the camshaft position sensor or circuit is faulty, most engines will start. However, the PCM misfire diagnostic will likely be affected.

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The part costs $50.....simple to change. It is NOT the O2 sensors so don't go wasting money on those. They are being affected due to related symptoms....they fault because the problem is happening upstream.

Oct 01, 2009 | 2002 Dodge Intrepid

1 Answer

High idle stalls at lights code for crank sensor


Crankshaft and Camshaft Position Sensors Camshaft Position Sensor Engine timing is determined from the relationship between the crankshaft and camshaft. This relationship is maintained by a timing chain or timing belt. The Engine Management System does not control engine timing but it does monitor the relative position and speed of these shafts by monitoring signals generated by sensors. The Engine Management System (EMS) uses signals generated by the camshaft position sensor to synchronize fuel injection to the valve sequence and for the on-board diagnostic procedure for misfire detection. The EMS energizes the injector at or near the time the intake valve opens. For misfire diagnosis, the EMS compares the number of camshaft sensor reference pulses and the number of crankshaft position sensor reference pulses received. If the EMS receives an incorrect number of pulses Diagnostic Trouble Codes (DTC’s) should be stored in the EMS.
If the camshaft position sensor or circuit is faulty most engines will start. Some engine management systems will then default to a pre-programmed injector firing sequence. All injectors may be energized simultaneously or all of the injectors on one bank may be energized at the same time. If the CMP data is required for misfire detection and reliable CMP data is not present misfire detection would probably be suspended.
Related Symptoms The following symptoms can be caused by an intermittent wiring connection or faulty signal to the EMS:
  • Extended crank time with a cold engine
  • Intermittent rough running
  • Unstable idle
  • Bucking
  • Hesitation
  • Stumble
  • Chuggle
  • Poor fuel economy
  • Stalling on acceleration
Crankshaft Position Sensor Engine speed is a very important input to the Engine Management System (EMS). Crankshaft speed and position are the basis for many calculations made by the computer. Crankshaft position values are transmitted to the computer by pickup coils also known as Permanent Magnet (P/M) generators, hall-effect sensors or optical sensors. The Crankshaft Position Sensor (CKP) also known as engine speed sensor is located in close proximity to the crankshaft.
In addition the EMS uses minute variations in the CKP sensor data to determine engine misfire. The EMS uses this information in conjunction with the camshaft position sensor to perform misfire diagnostics.
Related Symptoms: No Start/Intermittent Start Condition – Can be caused by a faulty crankshaft position sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit

Jun 23, 2009 | 2004 Nissan Altima

1 Answer

2001 jeep Grand Cherokee fuel injectors


check the injectors on that bank for pulses.. a regular 12v text light will do it should flash when cranking... its very possible that the crank sensor or camshaft sensor on the replacement engine is bad and giving you all the problems you have now.. are you using the original injectors? if you have injector pulses then check the coil for pulses the same way.. btw make sure you have 12v to them even before cranking engine could be a bad asd relay..wet plugs on one bank would also indicate a possible leaking injector and basicly draing the fuel starving the oposite bank for fuel.. to verify that the rail must be lifted by removing all 4 bolts make sure the clips hold the injectors firmly and turn the key to run but dont crank it then look for fuel leakin from bottom of injector(s) any drips is a bad injector..

Jan 28, 2009 | 2001 Jeep Grand Cherokee

2 Answers

2002 nissan sentra it wont start i got fire on the spark plugs bu


Injector pulse comes from Cam sensor, If you have a BAd CAMSHAFT sensor you will not get injector pulse, replace sensor and that should solve your problem. Good Luck and thanks for using FIX YA

Jan 20, 2009 | 2002 Nissan Sentra

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