Originally Posted by
Jonathandugan20
C3 reads 10+ volts on pins 39 and 25 and ZERO on 22
C3 39 is the oil level sensor, 22 is throttle body... I don't know what 25 is supplying
C4 reads ZERO voltage on pins 19 and 40
c4 19 goes to the accelerator pedal.... i dont know what 40 is supposed to supply
Its in the manual:
C4 pin 40: Fuel tank pressure sensor supply
Zero
C4 pin 19: Accelerator pedal sensor supply
Zero
C3 pin 22: Throttle body sensor supply (throttle body motor is C1 pins 3/6)
Zero
C3 pin 25: MAF/IAT sensor supply
10 volts
C3 Pin 39: Oil level and Map Sensor supply
10 volts
So NONE are correct. I am surprised you have 'highs' on some pins and "lows" on others.
I suspect C5 pins 5, 6 , 7, and 8. Those are the grounds to the ECU. I suspect one or more is open or resistive.
- I think you should unplug ALL connectors to the ECU and inspect both male pins and female sockets for damage/bent broken pins.
- THen, measure C5 pins 5, 6, 7 and 8 for their resistance to ground. Tie your meter's ground/common lead to the negative battery post and measure each pin, in the connector on the end of hte cable, to see what resistance you have back to the negative battery terminal. NOTHING over 1 ohm is what you want.*
- MAKE DAMN SURE your connectors to the ECU are actually making contact. I HATE the way they designed that connector mess, and I know they were just trying to make it secure and reliable.
I sure wish I lived close to you; this is driving me nuts.
*Touch your meter leads together and look at the meter, it should read zero ohms, (or something like 0.01 or 0.001) if it does not, you can't trust the meter.