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My battery light came on so i was inspecting my wiring harness for signs of ware.i found that my crank sensor harness was soaked in oil, leaking from the front main seal. i fixed the leak and cleaned the oil of the wires. i unplugged the quick disconnect crank sensor to clean it,but forgot to disconnect the neg. battery terminal.after rerouting the wire harness through the motor to the crank sensor and plugged the sensor back into the other end of the quick disconnect. now the car wont start at all! by unplugging the sensor,would that cause my ecu to reset, if so how to i manually reset the ecu??

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Unplugging or disconnecting battery will rest the computer every time. Here's a simple solution that should work for you. If the battery is in good shape and holding charge, then disconnect the ground to the battery. Allow 15 minutes to pass, before reattaching the ground. Reattach ground, and attempt starting the car. If it starts, let it run a few seconds and then turn it off. Let sit for about 20-30 minutes, and it should come up and run efficiently. If the battery light came on, it is most common that the battery is weak and the charging system is failing.

If the light does not go out after getting restarted, then replace the alternator, and the problem should be resolved given a battery that is not more than 4 years old. Otherwise, replace battery first, then the alternator if necessary.

Hope this helps!


Posted on May 31, 2010


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1 Answer

Cam or crank shaft sensor

It depends on which sensor and how it is designed. Some sensors are designed to function in an oil bath. Generally speaking, the sensor picks up a magnetic swipe of a gear or object as the cam or crank turns. I doubt an external oil leak would matter unless it gets into the wiring harness.

Jul 07, 2013 | Cars & Trucks

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Chevy equinox 05 lost engine power ch engine light flashed & smoke outta exaust. gave code po340

Trouble Code: P0340

Camshaft Position (CMP) Sensor Circuit

Possible Causes:

The following conditions may cause this DTC to set:

Incorrect harness routing near secondary ignition componentsIgnition coil arcing to wiring harness or ignition control (IC) module--Inspect the ignition coils for cracks, carbon tracking, or other signs of damage.Camshaft reluctor wheel damageThe sensor coming in contact with the reluctor wheelForeign material passing between the sensor and the reluctor wheelExcessive camshaft end-play

Trouble Code: P0340

Camshaft Position (CMP) Sensor Circuit

Possible Causes:

Inspect the 16-way engine harness to fuel injector harness connector, the CMP sensor connector, and the ECM connector for corrosion.With a DTC set, the engine may crank for an extended period of time at start-up.

Jan 05, 2013 | 2003 Nissan Altima

1 Answer

Occationally, when I first start the car in the morning & it is, or has been, raining, Cylinder 4 misfires and the check engine light comes on. A guy at a parts store determined from the codes that it...

If it does end up being a short due to a break in the insulation, you can get a replacement wiring harness from a junk yard or even order one and replace that section of harness. I doubt this is your problem. When you get a random misfire or a constant misfire on one cylinder that is not related to the coil or coil pack it is usually a problem with a Crank or Cam position sensor. You say it happens consistantly when it rains, that tells me it is most likely the Crank Position sensor and to be more precise a problem on the crank where that sensor is mounted that is preventing it from detecting the #4 firing position. Remove, clean both the crank and the sensor with clean rags and inspect he sensor wires for breaks or contact with moving parts. If any are found replace the crank position sensor.

Oct 16, 2011 | 2003 Mazda MPV

1 Answer

1999 Malibu with a 2.4, 180K miles, ran great then got in it one morning, and it hasn't run good since. Barely starts, no power, rough idle, Po300 code. Changed plugs, coils, module. No change. ...

Yes, crank sensor may be the problem. Have you looked at the sparks to see if they are strong and periodic? A new sensor is under $20--lucky you. Here is a quick test of the sensor, which is just above the oil filter:

  1. Turn the ignition key OFF .

NOTE Inspect crank sensor and connector for signs of oil leaking through the sensor. This would indicate a defective sensor.
  1. Unplug the sensor electrical harness and check the terminals for corrosion and damage.
  2. Check the sensor wiring harness wires for continuity and repair as necessary.
  3. Disconnect the sensor and connect the test leads across the terminals A and B .
  4. Resistance should be between 900-1200 ohms.

May 16, 2011 | Chevrolet Malibu Cars & Trucks

1 Answer

How to replace cam sensor

This unit is part of the distributor.


See Figure 1
The ECM uses the camshaft signal to determine the position of the No. 1 cylinder piston during its power stroke. The signal is used by the ECM to calculate fuel injection mode of operation.
If the cam signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injected mode based on the last fuel injection pulse, and the engine will continue to run.

0900c1528008f0d2.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Camshaft Position (CMP) sensor location


See Figure 2

0900c1528008f0d3.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Camshaft Position (CMP) sensor wiring schematic

  1. Disconnect the CMP sensor wiring harness and connect an LED test light between CMP harness terminal C and battery ground.
  2. With the ignition ON and the engine off, verify that the test light illuminates.
  3. If not as specified, repair or replace the fuse and/or wiring.
  4. Carefully connect the test light between CMP harness terminal A and C and verify that the test light illuminates.
  5. If not as specified, repair the CMP harness ground circuit (terminal A).
  6. Turn the ignition OFF and disconnect the test light.
  7. Next, connect suitable jumper wires between the CMP sensor and CMP sensor harness. Connect a DC volt meter to the jumper wire corresponding to CMP terminal B and battery ground.
  8. Start the engine and verify that the voltage signal is 5-7 volts.
  9. If it is not as specified, the CMP sensor may be faulty.


  1. Disconnect the negative battery cable.
  2. Detach the sensor harness connector at the sensor.
  3. Unfasten the retaining bolt, then remove the sensor from the camshaft housing. Inspect the sensor O-ring for wear, cracks or leakage and replace if necessary.

To install:
  1. Lubricate the O-ring with clean engine oil, then place on the sensor. Install the sensor into the camshaft housing.
  2. Install the CMP sensor retaining bolt, then tighten to 88 inch lbs. (10 Nm).
  3. Attach the sensor harness connector.
  4. Connect the negative battery cable.

Feb 15, 2011 | 1996 Chevrolet C1500

2 Answers


The wire harness for the crank senser can get into troble and make a crasy cut out miss stumble, You may have to remove the senser and unplug it, Remove the lagging cover and inspect the wire by bending it. (bends easy it's broke ). The break can be in the wire past the plug on the engine harness the wire gets hot and brittle or even oil soaked as the oil transmits heat better than air and makes the insulation get hard quicker. Lots of different cars and other engines ( chainsaws, Lawnmowers , boats, Motorcycles) Your car is old and the wires are too.

Feb 18, 2010 | 1999 Mercury Cougar

2 Answers

1)How difficult is it to change crank case position senor for 2002 Olds Aurora 4.0 engine? Eng check lite on for that reason. 2) Losing oil only when engine running. Can smell in passenger compartment when...

2002 Oldsmobile Aurora V8-4.0 Replace Crankshaft (Sensors) A and B This car has 2 sensors 1- Raise and support car. 2- Remove the oil filter adaptor. 3- Remove crankshaft sensor electrical connector. For specific CKP sensor identification. 4- Remove the crankshaft sensor retaining bolt. 5-Remove the crankshaft sensor. NOTE= Inspect the CS sensor o-ring for wear or damage, if problem is found replace it also. 6- Lube O-ring with clean engine oil. 7- Install theretaining bolt TIGHTEN to 10 N.m (89lb in) 8-Install the CS sensor electrical connecror. 9- Install oil filtor adaptor. 10- Lower car. 11- Operate engine and inspect Cs sensor for oil leaks 12Perform the CKP system variation learn procedure.

Feb 10, 2010 | 2002 Oldsmobile Aurora

1 Answer

Ck engine light on code po335 p1336 also location of sensor?

P0335 and P0336 Engine crank sensor malfunction
To test this code, have a visual inspection of the location and wirings of the crank sensor. If the engine has a cam sensor, you might mistook it as the crank sensor (it is a good idea to contact ATS that can research this for you). Check the sensor wires for insulation making sure it is getting a voltage signal as shown in the wiring diagram. Sometimes, the wires itself is soaked with dirty oil causing the sensor to fail. If OK, check the engine timing belt system for any slack which can also cause the sensor to throw in the code. If all of these prove OK, remove the crank sensor and check it for resistance as compared to the standard specs. Lots of times, if the sensor probe end is contaminated with oil or cracked, this can only be revealed after the crank sensor is removed

Jun 02, 2009 | 1999 Pontiac Montana

1 Answer



What is the car doing that makes you think the timing is off? teh Serp belt does not control timing on that motor. It uses 2 sensors to adjust the timing. 1 being a cam sensor and another being a Crank sensor. You may have damaged the crank sensor when you replaced the oil switch and removed the Serp belt. Now it could also be you removed the harness and forgot to reattach or the wires got damaged as well. Please inspect them to make sure its on and not damaged.
Is the check engine light on? If so pull that and see if it brings up the crank sensor or soemthing else.

Mar 27, 2009 | 1993 Buick Regal

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