Okay, first I know this thread is old, but I have questions on this CPS wire issue.
Two days ago, my car was running fine and then when I got up to go to work the following day, it would crank and not start. It was cranking just fine, too.
I had fuel pressure, no blocked airways, so fire was the missing element. I removed spark plug wire #1 and got nothing while cranking.
Checked codes and got the code 12 (as mentioned by jdub). Just for kicks, I checked the IG fuses too and they were not blown. I checked for power at the igniter and it had 12 volts. I checked the resistances in the CPS per TSRM and they were all at the top end of the range, but in there. I also checked everything for the igniter in the TSRM except for the 3V dry battery test.
I checked the coil packs and all three had 12 volts when the should (IG on), resistances were in the specified range, and there was no continuity to the mounting frame.
I also have the Maft Pro installed and I was getting no RPM signal on the tach or the Pro. The Pro gets it from IGt and the tach from B off the igniter, so since the signals were both missing from the same source (not the CPS), I thought the igniter had gone bad.
Got one from the salvage yard and replaced it with no luck. I checked all the wires one more time and for grins wiggled the CPS wires and it started!
My question is what does the CPS have to do with creating the RPM signal? Is it sending a signal to the ECU to tell the igniter to do something?
Thanks!
Two days ago, my car was running fine and then when I got up to go to work the following day, it would crank and not start. It was cranking just fine, too.
I had fuel pressure, no blocked airways, so fire was the missing element. I removed spark plug wire #1 and got nothing while cranking.
Checked codes and got the code 12 (as mentioned by jdub). Just for kicks, I checked the IG fuses too and they were not blown. I checked for power at the igniter and it had 12 volts. I checked the resistances in the CPS per TSRM and they were all at the top end of the range, but in there. I also checked everything for the igniter in the TSRM except for the 3V dry battery test.
I checked the coil packs and all three had 12 volts when the should (IG on), resistances were in the specified range, and there was no continuity to the mounting frame.
I also have the Maft Pro installed and I was getting no RPM signal on the tach or the Pro. The Pro gets it from IGt and the tach from B off the igniter, so since the signals were both missing from the same source (not the CPS), I thought the igniter had gone bad.
Got one from the salvage yard and replaced it with no luck. I checked all the wires one more time and for grins wiggled the CPS wires and it started!
My question is what does the CPS have to do with creating the RPM signal? Is it sending a signal to the ECU to tell the igniter to do something?
Thanks!