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Need technical question answered. Should a BMW camshaft

Customer Question
Need technical question answered...

Need technical question answered. Should a BMW camshaft position sensor read approximately 500 ohms across terminals 1 and 2 ? I have ordered 3 sensors and all read infinity.

Mechanic's Assistant: Which particular sensor are you asking about? And have any trouble codes been triggered?

No codes, only one camshaft sensor on my 740iL

Mechanic's Assistant: What year is your 740il?

1997

Mechanic's Assistant: Are you fixing your 740il yourself? What have you tried so far?

Car crank but no start. Pulled sparkplugs and all are dry

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I rebuilt the engine and have all ne parts

Submitted: 10 months ago.Category: BMW
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Answered in 2 hours by:
9/22/2017
BMW Mechanic: Todd M, ASE Certified Technician replied 10 months ago
Todd M
Todd M, ASE Certified Technician
Category: BMW
Satisfied Customers: 1,902
Experience: Technician at Montgomery Motors
Verified

Hello. My name is ***** ***** I will be assisting you today. This sensor is a hall effect sensor and can not be measured in ohms. The best way to test this sensor is with a scan tool or oscilloscope so that you are able to observe the wave patterns. Here, I am attaching information on the function and testing of this sensor.

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BMW Mechanic: Todd M, ASE Certified Technician replied 10 months ago

If you require more information on this issue and/or are not satisfied, let me know, please, and I will attempt to assist you further on this. I hope this information points you in the right direction. If you have any further questions or concerns on this issue, feel free to ask. If you are satisfied, and have found this information helpful, a positive rating would be greatly appreciated. Thank you.

A positive rating does not close the session. We will still be able to communicate, and I will still continue to assist you with this issue as needed.

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Customer reply replied 10 months ago
The sensor is a coil, and thereby show an ohm reading. There is a voltage on the coil when the engine is rotating and the making and breaking of the circuit by the rotating cam induces an signal back to the computer to indicate that the engine is rotating and should allow starting of the car ! Please double check and let me know.
BMW Mechanic: Todd M, ASE Certified Technician replied 10 months ago

Just a moment, please.

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BMW Mechanic: Todd M, ASE Certified Technician replied 10 months ago

I have checked and double checked. If this vehicle is a 1997 740iL, then the sensor is a hall effect sensor. Aside from that, though. Have you Checked the wiring from the ECM to the sensors? If the wiring is damaged then this will cause your issue for sure. Also, the ECM itself should be considered.

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BMW Mechanic: Todd M, ASE Certified Technician replied 10 months ago

Give me a moment, please. Let me check for testing information for you.

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Customer reply replied 10 months ago
I have feed to the sensor. Answer me this, is the sensor a coil or not ? My reasoning is that the Hall Effect acts just like a generator at a power plant. Every time the cam tines pass the sensor(coil) it make and breaks the circuit and produces the square wave signal.
BMW Mechanic: Todd M, ASE Certified Technician replied 10 months ago

You need to test the wiring in between the sensor and the ECM. The sensor contains coils but is a hall effect sensor, which means you have to test it while it is functioning. I have attached description and operation information. The information I sent is specific to your vehicle. You will need to have the vehicle scanned in order to determine the area of concern.

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BMW Mechanic: Todd M, ASE Certified Technician replied 10 months ago

I have attached testing information for the vehicle. All includes wave testing for a scanner.

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BMW Mechanic: Todd M, ASE Certified Technician replied 10 months ago

Here, is the connector view for the ECM so that you will be able to test the wiring for continuity.

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BMW Mechanic: Todd M, ASE Certified Technician replied 10 months ago

Check out this information and get back to me.

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Customer reply replied 10 months ago
You said "The sensor contains coils but is a hall effect sensor". It is only one coil, as such shouldn't it read ohms as a coil does?
I guess we're saying different things and I believe that I am correct as I checked the crankshaft sensor and got approximately 780 ohms of resistance. I also checked several sites on UTube and found other people got an ohm reading on the camshaft position sensor.
Thanks for you opinion but I cannot give you the additional fee as I believe you are incorrect.
BMW Mechanic: eric remington,
 replied 10 months ago
eric remington
Category: BMW
Satisfied Customers: 1,060
Experience: mechanic/service advisor at topline auto
Verified

do you have any codes ? my name is eric

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Customer reply replied 10 months ago
No codes. Engine cranks but won't start. Fuel pump new, fuel regulator new, new plugs and injectors. Spark plugs all dry as if it's getting no fuel.
BMW Mechanic: eric remington,
 replied 10 months ago

what is fuel pressure? are injectors working?

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Customer reply replied 10 months ago
fuel pressure good and there is a 12v feed to injectors but I don't think they are opening. That is why I believe the camshaft position sensor is defective.
BMW Mechanic: eric remington,
 replied 10 months ago

ok have you checked to see if you are getting pulse ground from microprocessor?

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Customer reply replied 10 months ago
No. How would I do that? My original question was I believe there should be a resistance read across the camshaft position sensor of approximately 500 ohm. If there is no resistance I thought the sensor would be defective and would not send a signal back to the PCM to allow the car to start.
Customer reply replied 10 months ago
I have checked several sites on UTube and the all have shown an ohm reading on the sensor
BMW Mechanic: eric remington,
 replied 10 months ago

l​etg me see if I can find that but b4 you do that just make sure that you are not getting pulse ground...since you desire any resistance specs that might be available I will ck that for you

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Customer reply replied 10 months ago
My 12v induction
tester shows I am getting a signal to the injectors
BMW Mechanic: eric remington,
 replied 10 months ago

s​o injectors are firing? did you ck that with injector connected or disconnected...how much fuel pressyure? also do you have starting ffluid if you spray stating flyuid into intake does engine start?

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Customer reply replied 10 months ago
How would I check for a pulse ground?
BMW Mechanic: eric remington,
 replied 10 months ago

I know you are getting 12 volts are you getting a good pulse ground with injector plugged in?

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BMW Mechanic: eric remington,
 replied 10 months ago

do you have a test light?

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BMW Mechanic: eric remington,
 replied 10 months ago

a logic probe? or even a multimeter?

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Customer reply replied 10 months ago
approximately 40psi, injectors was disconnected at the electrical plug when checked. Starting fluid allowed the engine to run for a short time. I have a multimeter
BMW Mechanic: eric remington,
 replied 10 months ago

ok hook up the multimeter with injector hooked up backprobe injector and crank see if you get cranking voltage 9 volts or so

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Customer reply replied 10 months ago
Will have to do tomorrow. Did you say you would check if the sensor should have an ohm reading?
BMW Mechanic: eric remington,
 replied 10 months ago

yhes I will look that up sorry I was waiting to see if you had pulse but I will look that up for you

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Customer reply replied 10 months ago
Unplugged #8 injector. Got 6.7v on one terminal and 12.5v on the other. After I plugged back in I had 12.5v on both terminals without cranking engine??
Customer reply replied 10 months ago
I show about 360RPM on my scanner but my RPM meter on the dash doesn't show any fluctuation. Which sensor (cam or crank) operates the dash meter?
BMW Mechanic: eric remington,
 replied 10 months ago

o​k the 12 volts with it unplugged is normal. backprobe the in jector and on ly one side will have positive and the other should be a ground on and off like a pulse as you crank. the computer commands a ground to open the injector for a short time each crankcase rotation

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BMW Mechanic: eric remington,
 replied 10 months ago

the resistance reading is 1.3 to 1.5 ohms

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      camshaft position sensor

      TSBs (1)

      Title

      QUALITY MONITORING M44 / M62 CAMSHAFT SENSOR

      Print

      camshaft position sensor

      

      SPECIFICATIONS

      RESISTANCE SPECIFICATIONS (4-CYLINDER)

      Component(1) Ohms

      Crankshaft (Speed/Position Pulse) Sensor480-600

      Camshaft Position

      (Cylinder Identification) Sensor1.3-1.5

      Engine (Coolant) Temperature Sensor

      63-73°F (17-23°C)2300-2700

      171-181°F (77-83°C)300-360

      Fuel Evaporation Control Solenoid25-65

      Fuel Injector15-17

      Fuel Injectors (Group Of 2)7.5-8.5

      Idle Speed Control Valve (Per Winding)15-25

      Ignition Coil (Primary)0.8

      Intake Air Temperature Sensor

      63-73°F (17-23°C)2200-2700

      117-127°F (47-53°C)760-910

      Throttle Position (TP) Sensor

      Idle Position3200-4800

      Fuel Load (WOT) Position800-1200

      (1) Measured at an ambient air temperature of 64-82°F (18-28°C).

      RESISTANCE SPECIFICATIONS (6-CYLINDER)

      Component(1) Ohms

      Mass Air Sensor

      Between Terminals No. 5 & 63-4

      Between Terminals No. 1 & 516,300

      Camshaft Sensor1.3-1.5

      Crankshaft (Speed/Position Pulse) Sensor490-590

      Engine (Coolant) Temperature Sensor

      9-19°F (-13 To -7°C)8260-10,560

      63-73°F (17-23°C)2200-2700

      171-181°F (77-83°C)290-364

      Fuel Evaporation Control Solenoid40-50

      Fuel Injector15-17

      Idle Speed Control Valve (Per Winding)15-25

      Ignition Coil (Primary)0.8

      Intake Air Temperature Sensor

      63-73°F (17-23°C)2200-2700

      117-127°F (47-53°C)760-910

      Throttle Position (TP) Sensor4600

      (1) Measured at an ambient air temperature of 64-82°F (18-28°C).

      RESISTANCE SPECIFICATIONS (V8)

      Component(1) Ohms

      Crankshaft (Speed/Position Pulse) Sensor490-590

      Camshaft Position

      (Cylinder Identification) Sensor1100-1400

      Engine (Coolant) Temperature Sensor

      63-73°F (17-23°C)2300-2700

      171-181°F (77-83°C)300-360

      Fuel Evaporation Control Solenoid25-65

      Fuel Injector15-17

      Idle Speed Control Valve (Per Winding)6-10

      Ignition Coil (Primary)0.8

      Intake Air Temperature Sensor

      63-73°F (17-23°C)2200-2700

      117-127°F (47-53°C)760-910

      Throttle Position (TP) Sensor(2)

      (1) Measured at an ambient air temperature of 64-82°F (18-28°C).

      (2) Information is not available.

      TORQUE SPECIFICATIONS

      TORQUE SPECIFICATIONS

      ApplicationFt. Lbs. (N.m)

      Intake Manifold Bolts (4-Cylinder)11 (15)

      Oxygen Sensor41 (55)

      INCH Lbs. (N.m)

      Camshaft Position Sensor62 (7)

      Crankshaft Position Sensor62 (7)

      engine controls timing systems

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      Ask Your Own BMW Question
      BMW Mechanic: eric remington,
       replied 10 months ago

      but then further down t gives a different reading strange...well anyways back probe injector and see if yo9u are getting power and pulse groun d to injector...if a sensor is bad should set a code...normally speaking

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      Customer reply replied 10 months ago
      Battery died. You're saying that probing both wires on the injector and cranking the engine will give me a +12V on one terminal and a -12v on the other one, correct? I'm not getting a sensor code.
      BMW Mechanic: eric remington,
       replied 10 months ago

      w​ell it will average out lower because you are getting a ground that pulses...a logic probe can also be used to ck pulse ground there is a tst litye that is computer safe but you might get somewhere between 4 to 8 volts while cranking seeing how ground is on and off

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      BMW Mechanic: eric remington,
       replied 10 months ago

      the meter is going to give you an average of what it is reading because it is so fast

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      BMW Mechanic: eric remington,
       replied 10 months ago

      disconnect the cam sensor and crank it if you get a cam sensor code then we will know that computer is recognizing and not recognizing cam sensor....the cam sensor is input to pcm for injector reference

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      BMW Mechanic: eric remington,
       replied 10 months ago

      but first see if you are getting pulse ground....you could use a noid light...regular test light not recommended due to possible pcm damage

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      BMW Mechanic: eric remington,
       replied 10 months ago

      logic probe

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      Customer reply replied 10 months ago
      I'm out of commission for a while. I pulled the cover off from my fuel pump to inspect it and found all of the insulation on the wires brittle and flaking off. I have a new cover (fuel level sending unit) ordered but it won't be here until the first week of October.
      BMW Mechanic: eric remington,
       replied 10 months ago

      let me know if I can help with anything else

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      BMW Mechanic: eric remington,
       replied 10 months ago

      by the way logic probes relatively inexpnesive also they make a noid light tends to be accurate but I don't think they draw as much amps as an injector

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      BMW Mechanic: eric remington,
       replied 10 months ago

      so you are putting in a sending unit that should have no bearing on fuel pressure....do you need any more help from me? do you understand how to ck injector pulse? you have the spec for cam sensor...

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      BMW Mechanic: eric remington,
       replied 10 months ago

      I​f you put ina cam sensor and car still does not get pulse pcm may be at fault ck all connections...let me know if you have more questions or need more advice do you want to keep this post open till you get your fuel gauge piece?

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