CEL P0335 and P0340 and Wont Start

[pborowski]

Ok here is my story, about 3 weeks ago I change the "Timing Chain Tensioner" (leaking oil). Car runs fine then stalled out and now the wont start . I was able to pull code P0335 for the Crankshaft Postion Sensor- changed the sensor cleared the codes, and the car still wont start, this time I pulled P0340 code for the Camshaft position sensor. Are these sensor prone to failure or is there somthing else needed to be done other than just swapping them out . Any direction/idea procedure on installing and testing?

2001 Corolla 1.8

[fishexpo101]

Who did the work for the timing chain tensioner? Was the tension on the chain verified - little hook on the tensioner fully released to put tension on the chain?

Camshaft and crankshaft sensors can go bad, but very unusual to go out at the same time like that, especially after replacing a part that is tangentially associated with both systems.

P0340 - Camshaft Position Sensor Circuit Malfunction - this means that something is causing the sensor's signal from getting to the ECM. Replacing the sensor will very rarely fix this issue - as the problem is somewhere in the entire circuit.

P0335 - Crankshaft Position Sensor Circuit Malfunction - again, this means that something is causing the sensor's signal from getting to the ECM. Replacing the sensor will very rarely fix this issue - as the problem is somewhere in the entire circuit.

Chances are, chassis ground or short in the wiring is causing this. May depend on how much was moved out of the way to get to the timing chain tensioner (replaced just o-ring or whole thing?). Another possibility, tensioner was fully set against the chain, causing excessive slack that might be confusing the sensors. Both sensors can be checked out via a multimeter (shorts and opens) and a scanner with freeze frame data capability.

[pborowski]

Hey thanks for the info I was the one that installed the tensioner - It was a new one from the dealer, and I found the install instructions on one the posts in this forum- ( did remove other parts to get to it), And I was able to lock it and release by turning the crankshaft counter clockwise until I heard it relase- the car ran fine for about 3 weeks after that then all of a sudden - Poof stalled and no starting. Prevous to the tensioner being installed the car would also stall when making turns and would experience a drops in the RPM's -I'll keep digging!!!