5v reference throttlebody or accelerator?
Thread Starter
Instructor
Joined: Mar 2011
Posts: 134
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From: Port Orchard Washington
5v reference throttlebody or accelerator?
Don't normally post unless I go weeks without solving the problem but prior to an underway I ran some errands which I had to stop a few times in the rain. At my last stop prior to going home the car just clicked a ton and said reduced engine power. I've had lots of problems with starters and recently put in a new aftermarket one so initially thought that was the problem. Attempted to push start the car and it started but ran reduced engine power. Disconnected the battery/reconnected and push started it and it ran fine all the way home. Now that it is home it won't start and I get p2135 and p0651. I have gone through most of the troubleshooting but see mixed things on what voltages I am supposed to see on the throttlebody connector. It's in the garage so I can't attempt to push start but I did jumper the starter through the fuse box and it turns over the car. Had a burnt connector on starter and I rewired and replaced it incase and same problem. Any help is appreciated as I'd love to drive my car.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,433
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From: Cape Coral, Florida
There are 2 each 5 volt reference circuits which use 5 volts on different circuits…TPS 1 and 2 are associated with the 5 volt #2 circuit…if you can see the TPS voltages and 5 volt reference 1 and 2 with a scan tool or use a DVOM to check each of the 5 volt reference circuits on the throttle body that would help…a shorted 5 volt reference circuit can take the whole car down if shorted to ground somewhere…the 2135 and 0651 are related..if the ECM sees a predetermined difference in TPS1 vs TPS2 the trouble code sets.
Thread Starter
Instructor
Joined: Mar 2011
Posts: 134
Likes: 0
From: Port Orchard Washington
I had a constant 1v on and read it with the tech 2 while jiggling some wires and seemed to be grounded near the headers/starter and got the 5v back. Now that is fixed when I go to start the car the voltage drops to 0v and then the car clicks a ton and doesn't turn over. With the throttlebody disconnected I am getting voltage on the line. 5.02 on 5v reference, 4.11 on tps sensor 2, zero on tps sensor 1.
