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Discussion Starter #1
Hello friends,

I have fixed everything on my supra except one thing before I can go to inspection and get this baby back on the road.

I have discovered something while checking out this code and that is :

If I reset the codes, I start the car and hold down the clutch, then there is no engine light. If I release the clutch while in neutral, the engine ligh comes on. This is a code 13 which has to do with crank sensor, cam sensors, or ECU.

I am wondering if someone has seen this before where you release clutch and get the code to pop. If I dont release I dont have a code. Just wondering if someone could point me in the right direction. I have a feeling this has to do with crank but I am unsure.

Thank you for all input, it is highly appreciated!
 

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Check the crank sensor resistance to see if it’s within tolerance. Values are found easily on google. Thankfully, crank sensor replacement is pretty easy if you need to do it.

Seems weird though given your symptoms. Maybe the neutral start switch messed up somehow? If the crank or cam sensors are bad the engine would have trouble starting.
 

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Discussion Starter #3 (Edited)
Check the crank sensor resistance to see if it’s within tolerance. Values are found easily on google. Thankfully, crank sensor replacement is pretty easy if you need to do it.

Seems weird though given your symptoms. Maybe the neutral start switch messed up somehow? If the crank or cam sensors are bad the engine would have trouble starting.

I will check resistance on the crank sensor (thanks for insight) as soon as I have time to jack her up which should be this weekend. The symptoms are weird and specific. The car runs great. I can hold the clutch down and it wont pop up until I release it...
 

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Dr. Jeff Lange
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JZA70’s (factory ones) have no switches on the clutch, so what’s likely happening when you release the clutch is that it’s loading the engine slightly and causing an issue with one of the sensor signals.

I suspect you may need a new sensor.

Jeff
 

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JZA70’s (factory ones) have no switches on the clutch, so what’s likely happening when you release the clutch is that it’s loading the engine slightly and causing an issue with one of the sensor signals.

I suspect you may need a new sensor.

Jeff
Is neutral start switch a north american requirement then?
 

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Dr. Jeff Lange
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Yes it has been included on all North American Toyotas since around 1985. Some earlier had it as well, but not all.

Most Japanese Toyota models didn’t get a clutch start switch until the early 2000’s. Even later for some other countries (or not at all).

Same goes for the pull-up to lock the door handles. Toyota in North America ditched it for the 1988 model year but it continued in Japan for another decade or longer.

Jeff
 

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Discussion Starter #7
Hi friends this is a follow up to the code 13. I ended up changing both cam sensors then I decided to look into the timing belt before changing the crank shaft sensor. It turned out that the timing belt was not put on right by the previous owner. Off by 4 notches on the exhaust cam and off by about 10 notches on the crank shaft. Thank god the non vvti are non interference engines!!!!

So I redid my timing belt took me about 20 mins... and the code 13 is gone!!!


So to recap : if you have a code 13. It can be one of the following :

Cam sensors
Crank shaft sensor
Wiring for sensors
Anything to do with timing (timing belt etc)
and ECU

Good luck to all who get this code!
 
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