jonjon8585
Banned Member
- 52
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- Mar 17, 2009
-
la,
New York
I know the blue wire with red stripe goes to the ECU but where do the other two go? Is one a positive and the other a ground? Its a 420a and the original harness is junk so I need to wire everything up without the harness.
I found the info I needed and then some. Posted by DSM N/T Wiseman "The cam and crank sensors work as a team. The cam sensor is responsible for telling the injectors when to fire and the crank sends the signal for ignition fire. Typically, loss of cam sensor signal alone will not cause a loss of ignition. The injectors will simply "gang" fire. Which means instead of firing one at a time, they all fire at the same time.
The cam sensor has three wires going to it. The dark blue with a red tracer is the camshaft position sensor signal wire. The yellow wire is the 8 volt reference wire. The black with a dark green tracer is the ground wire. The ground wire and the 8 volt reference wires are both shared with the crank sensor. The 8 volt reference wire is also shared with the Transmission control module (for automatic cars) or the vehicle speed sensor (manual transmission cars).
If any of these three sensors are internally shorted, it may cause the loss of cam, crank, and/or vehicle speed sensor signal causing the car to stall out, not crank or not display vehicle speed.
Each of these sensor connectors (harness side) should be checked for 1: 8 volt reference, 2. continuity to ground, 3. continuity from sensor to PCM. Use of a digital multi-meter and a small amount of understanding on how this circuit works will help reduce vehicle down time as well as costly expenses due to mis-diagnosis or guess work.
Doug"
Do sensors need a power and a ground? That would pretty much solve the problem.
I found the info I needed and then some. Posted by DSM N/T Wiseman "The cam and crank sensors work as a team. The cam sensor is responsible for telling the injectors when to fire and the crank sends the signal for ignition fire. Typically, loss of cam sensor signal alone will not cause a loss of ignition. The injectors will simply "gang" fire. Which means instead of firing one at a time, they all fire at the same time.
The cam sensor has three wires going to it. The dark blue with a red tracer is the camshaft position sensor signal wire. The yellow wire is the 8 volt reference wire. The black with a dark green tracer is the ground wire. The ground wire and the 8 volt reference wires are both shared with the crank sensor. The 8 volt reference wire is also shared with the Transmission control module (for automatic cars) or the vehicle speed sensor (manual transmission cars).
If any of these three sensors are internally shorted, it may cause the loss of cam, crank, and/or vehicle speed sensor signal causing the car to stall out, not crank or not display vehicle speed.
Each of these sensor connectors (harness side) should be checked for 1: 8 volt reference, 2. continuity to ground, 3. continuity from sensor to PCM. Use of a digital multi-meter and a small amount of understanding on how this circuit works will help reduce vehicle down time as well as costly expenses due to mis-diagnosis or guess work.
Doug"
Do sensors need a power and a ground? That would pretty much solve the problem.
