Crank Angle Sensor DEAD. Why?

[NetViper]

I went to the shop today to check on the car and watched him OHM the Crank Angle Sensor. It is supposed to read between 650-850ohms. It read between 0 and .05 on most at best on all 4 sensors. It is totally hosed. So, now it needs to be replaced. Yes, this is the brand new sensor that was installed less than 3 months ago.

My question is why would this happen? Does it have something to do with a voltage surge? Is it Split Second Related? ECU? What can I do to make sure it does not happen again?? Any ideas?

Thanks all.

 

[MiamieNeSeX]

Ok here are a few questions:


What does your technician think it is?

Is there not a SS savy tuner in your area?

If not, why get a car that depends on the SS box?


and last but not least:

Is this the same technician that couldn't tell the difference between a OBDI and an OBDII car?




Armando

 

[Briank]

0 to .05 ohm ?? thats a short. I would have assumed they would have opened. Does the car even run? Looks like he mesured voltage not ohms.

 

[NetViper]

0 to .05 ohm ?? thats a short. I would have assumed they would have opened. Does the car even run? Looks like he mesured voltage not ohms.

Maybe I got the .05 wrong. That would be my error.

Nonetheless, I watched him measure the old unit and come up with 720 and then hit this one and get no reading. He knew what he was doing. Not one of the tests produced a reading anywhere near the normal range. We tested the wires and the connection.

 

[WOODY]

where is he measuring the voltage? The SS box itself is a drain on the cam angle sensor. This is the reason for the "switch" solution which cuts out the SSBB during startup. The cold start issues were due to insufficient cam angle sensor signal. Just a thought.

 

[NetViper]

where is he measuring the voltage? The SS box itself is a drain on the cam angle sensor. This is the reason for the "switch" solution which cuts out the SSBB during startup. The cold start issues were due to insufficient cam angle sensor signal. Just a thought.

We are measuring at the harness, next to the alternator. Once unplugged, it should be the same as measuring if it was not even attached to the car.

 

[MiamieNeSeX]

Hope you are getting good money from your "tech" for diagnosing your own car

Armando

 

[NetViper]

. Does the car even run?

They moved the car while I was there. Started right up. They said the car will hold a setting in memory to start the car. I talked to the NSX tech in Augusta today and he said that was the NSX - limp home backup.

 

[Zennsx]

Maybe I got the .05 wrong. That would be my error.

Nonetheless, I watched him measure the old unit and come up with 720 and then hit this one and get no reading. He knew what he was doing. Not one of the tests produced a reading anywhere near the normal range. We tested the wires and the connection.

0 still =short circuit. Aren't the sensors inductors? And if they are how are they dead shorted???

 

[WOODY]

What made you check the sensors in the first place? you should have DTC lights like crazy. Do you? are they using an obd II reader to diagnose? any possibility they are hitting the wrong pins in the harness? can you confirm circuit integrity to the sensors from the point of testing?(i dont know where the sensors are)

 

[NetViper]

What made you check the sensors in the first place? you should have DTC lights like crazy. Do you? are they using an obd II reader to diagnose? any possibility they are hitting the wrong pins in the harness? can you confirm circuit integrity to the sensors from the point of testing?(i dont know where the sensors are)

We checked the sensor because a Check Engine Light came on with ODB2 code P0336. That leads to the Crank Angle Sensor. According to the Service Manual, when you check the CAS, you ohm each coil and you should get 650-850 ohms. If you do not get that, the sensor is bad and replace it.

That is where we are. My question is what would cause it to be bad. It is my understanding that these rarely, if ever, die.

 

[Larry Bastanza]

Dave,

Does the car run, but occasionally you get the CEL?

Did you swap the plugs and is the misfiring cured?

LarryB

 

[NetViper]

Dave,

Does the car run, but occasionally you get the CEL?

Did you swap the plugs and is the misfiring cured?

LarryB

The car started up no problem last night when they drove it inside, but the CEL light was on. When I brought the car in, the CEL light was on. When they got it and took it out for a drive, it was off. They called and said all was fine. The next day they called again after moving the car and the CEL came right on. At this point, they say even if it is reset, the CEL comes on within a few seconds of it starting up.

Plugs will be changed when the CAS is swapped, but they detected no misfire. It sounded fine last night.

 

[NSXTech]

The sensors are a type of inductor. A reading of 0 on an ohmeter means that the coil is shorted so the strands of copper wire which make it up are not being read. Rather, the wires leading to the actual coils are the only reading you are getting. '0' means you are out of range on the meter and are actually reading infinate resistance for that range.

The more important question asked here is whether an NSX with no crank angle OR cam position reading will run, and the answer is no. If you have '0' in all four wire sets, the car can not run. Injector timing, as well as plug firing are determined by these four coils. The memory in the ecu only controls during cranking, but will not run the engine.

As we discussed NetViper, I would also look into a possible install issue, considering how soom after the head gasket was replaced, that this all occured.

HTH,
MB