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How do i check for resistance on a 2 wire crankshaft position sensor and a 3 wire cam sensor with a digital multimeter?

2004 GMC Envoy SLT 4.2L what the resistance numbers should? be please help.

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  • GMC Master
  • 1,334 Answers

If you have a meter, select the amps reading and place each lead to each terminal. if you have a reading, its good, if you do not (open circuit), sensor bad.

Posted on Dec 17, 2016

  • 13 more comments 
  • Geoff White
    Geoff White Dec 17, 2016

    That should be: select the OHMS range

  •  SeabeeMechanic
    SeabeeMechanic Dec 18, 2016

    Yes, meant to say ohms. Sorry

  • Joe Russell Dec 18, 2016

    on my multimeter ohms range is 2000k. 200k. 20k. 2000. 200. which number do i set it on?

  •  SeabeeMechanic
    SeabeeMechanic Dec 18, 2016

    Try with your lowest setting and then look at your readings. Readings will be different based on manufacturer.

  • Joe Russell Dec 18, 2016

    (2000k setting read 000) (200k setting read 00.5) (20k setting read 0.71) (2000 setting read 723) (200 setting read 1.) which setting do i go by?

  •  SeabeeMechanic
    SeabeeMechanic Dec 18, 2016

    Readings indicate that your part is working and may consider in other problem.

  •  SeabeeMechanic
    SeabeeMechanic Dec 18, 2016

    May want to check wiring and then for any codes

  • Joe Russell Dec 18, 2016

    if the crankshaft position sensor is working do that mean the problem is between crank sensor and the PCM that causing no spark at the spark plugs or do i need to check the wiring from the crank sensor to the PCM? if the PCM receiving a signal from the crank sensor so do that mean the PCM not sending a signal to the coils? i hope i can get this problem solve soon with your help. the vehicle was running good until turn the engine off but it wouldn't start up again no spark the codes are P2101,P1516,P2119 these codes was read after the battry cable been disconnected these codes are staying in the PCM when i disconnect the battry cable i thought they would be erase when disconnect the cable? how do i check for RPM signal when cranking?

  • Joe Russell Dec 18, 2016

    if the crankshaft position sensor is working do that mean the problem is between crank sensor and the PCM that causing no spark at the spark plugs or do i need to check the wiring from the crank sensor to the PCM? if the PCM receiving a signal from the crank sensor so do that mean the PCM not sending a signal to the coils? i hope i can get this problem solve soon with your help. the vehicle was running good until turn the engine off but it wouldn't start up again no spark the codes are P2101,P1516,P2119 these codes was read after the battry cable been disconnected these codes are staying in the PCM when i disconnect the battry cable i thought they would be erase when disconnect the cable? how do i check for RPM signal when cranking?

  •  SeabeeMechanic
    SeabeeMechanic Dec 18, 2016

    https://www.google.com/search?site=&sour...

  •  SeabeeMechanic
    SeabeeMechanic Dec 18, 2016

    https://www.google.com/search?ei=DIdWWMz...

  •  SeabeeMechanic
    SeabeeMechanic Dec 18, 2016

    https://www.yourmechanic.com/article/thr...

  •  SeabeeMechanic
    SeabeeMechanic Dec 18, 2016

    http://www.gm-trucks.com/forums/topic/65...

  •  SeabeeMechanic
    SeabeeMechanic Dec 18, 2016

    https://www.yourmechanic.com/article/p21...

  • Joe Russell Dec 18, 2016

    will codes P2101 and P1516 cause no spark at the spark plugs(coils)?

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How do i use a digital-830B multimeter?


set the meter mode to the ohms sign ( omega sign) set the scale to position the decimal point if the resistance is to large for the standard setting
to know what you are reading you will need to get the numbers from a workshop manual so that you can compare what you have to what it should be
it the sensor is working you should get a reading but if it goes straight all 000000 then there is a dead short or if it reads what you have when you switch the meter on it will be an open circuit --broken wire --
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If i replace an crankshaft position sensor do i have to reset anything?


maybe you got the wrong sensor, but you shouldn't have to reset any thing

Dec 14, 2016 | 2004 GMC Envoy

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How does the crankshaft position sensor operate what is it Job to do? and how do i test the injectors for pulsa with a noid light where are the injectors located on this vehicle?


The crank sensor is needed for the coils to fire. It is on the drivers side, mounted in the engine block back by the transmission. The injectors are under the plenum. The plenum wraps around them. I wouldn't worry about them right now. And your probably right about being flooded. I would throw new plugs in it when you replace the sensor.

Dec 11, 2016 | 2004 GMC Envoy SLT

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Where is the PCM located on a 2004 GMC SLT 4.2L?


Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Best Manuals

Dec 07, 2016 | GMC Cars & Trucks

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What kind of tool i can use to check signal at the coils connector/crankshaft sensor/camshaft sensor?


Have you tried a obd2/can code scanner? Usually the sensors like crank/cam will though a code to the computer and a code scanner will tell you what's wrong about of the time

Dec 03, 2016 | GMC Cars & Trucks

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How do i check the trigger side of the ignition coil? what is all the things that will cause no spark at spark plugs boot?


What are the fault codes in memory for this problem, if you haven't run that test borrow an OBD2 code reader and do the test.

Dec 02, 2016 | GMC Cars & Trucks

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Do a 2004 Envoy SLT 4.2L have a Ignition Module?


Crankshaft position sensor,cam sensor . your vehicle should have coil on plug , a coil at each spark plug !
Ignition Coils
Each ignition coil has an ignition 1 feed and a ground. The PCM supplies an ignition control (IC) circuit. Each ignition coil contains a solid state driver module as its primary element. The powertrain control module (PCM) signals the coil driver to initiate a firing event by applying a signal to the IC circuit at the appropriate time. When the signal is removed, the coil fires the spark plug. The spark plugs are tipped with platinum for long wear and higher efficiency.
During normal operation the powertrain control module (PCM) controls all ignition functions. If either the crankshaft position (CKP) or camshaft position (CMP) sensor signal is lost, the engine will continue to run because the PCM will default to a limp home mode using the remaining sensor input. As mentioned above, each coil is internally protected against damage from excessive voltage. If one or more coils were to fail in this manner, a misfiring condition would result. Diagnostic trouble codes are available to accurately diagnose the ignition system with a scan tool.
If a crank sensor is replaced a Crankshaft Position System Variation Learn must be done and a scan tool is need to do this.

Nov 30, 2016 | 2004 GMC Envoy SLT

1 Answer

The engine will crank but will not start why?


Do you have any codes or an engine light on, in your dash board ? Have you checked for spark at your plugs ? There are many things that could cause a vehicle to not start. Bad camshaft/crankshaft sensors. Poor ground wiring. Defective spark plugs or wires/coils.

Nov 22, 2016 | 2004 GMC Envoy

1 Answer

Was getting gas & spark & now no spark on any plugs


Crankshaft position sensor , possibly !
Crankshaft Position (CKP) Sensor
The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The PCM supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution.
There are a lot of videos on youtube on testing crankshaft position sensors an Cam sensors !
There

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