Posted By: barnacle
Touting for interest - plug-in cam sensor tester - 27/05/2012 18:19
Here's the scenario. It's raining, it's dark, and your 20v/vt won't start... and there's a red light on the dash.
Curses, you cry, the only fault that prevents starting *and* shows a red light is a cam or crank sensor fault - I wonder which it is? If only I had some sort of test box I could plug in...
Coincidentally, I've just demo'd the first prototype of such a device - it plugs in between the crank sensor and the loom connection and flashes an LED as every pulse is received. It doesn't affect the ECU and it can't tell you anything about the crank sensor (except that if the cam is working, and you need to sort the crank out!) - it's purely to confirm that the cam sensor is putting out pulses.
I'm thinking of a small metal box - about 1" by 1.5" by 3" - and a couple of cables to the loom, long enough that you can position it to be visible from the driver's seat. I expect the price to be under forty quid.
Is there any interest? Is it worth me knocking a few up?
(As an aside: I have heard - but do not know for certain - that in the case of a cam sensor failure, the engine can *sometimes* be fooled by injecting a fake pulse on the line. I suspect I can include something along that line as a possible 'get you home' emergency start...)
Curses, you cry, the only fault that prevents starting *and* shows a red light is a cam or crank sensor fault - I wonder which it is? If only I had some sort of test box I could plug in...
Coincidentally, I've just demo'd the first prototype of such a device - it plugs in between the crank sensor and the loom connection and flashes an LED as every pulse is received. It doesn't affect the ECU and it can't tell you anything about the crank sensor (except that if the cam is working, and you need to sort the crank out!) - it's purely to confirm that the cam sensor is putting out pulses.
I'm thinking of a small metal box - about 1" by 1.5" by 3" - and a couple of cables to the loom, long enough that you can position it to be visible from the driver's seat. I expect the price to be under forty quid.
Is there any interest? Is it worth me knocking a few up?
(As an aside: I have heard - but do not know for certain - that in the case of a cam sensor failure, the engine can *sometimes* be fooled by injecting a fake pulse on the line. I suspect I can include something along that line as a possible 'get you home' emergency start...)