Postal_Dave
Active Member
- Joined
- July 14, 2021
- Messages
- 93
- Reaction score
- 98
- City, State
- Greenville, SC
- Year, Model & Trim Level
- 1996, Explorer, 4.0
1996 Ford Explorer XLT 4.0 pushrod engine.
I have a Crank, No Spark, problem and I'm chasing wires. I already replaced the Crankshaft Position Sensor with a new one and I bench tested it to make sure it worked. I do get AC voltage when passing a piece of metal in front of it. The Ohms were 660. (If I read that right. .660 K)
Now I'm checking the wires. The CKP is not installed right now.
With the wiring clip disconnected from the CKP, I put sewing needles into each of the two connections, then used the alligator clips on my multimeter to test it. There is a blue wire that is supposed to be the positive wire and a grey one that is supposed to be negative.
With the multimeter set to DC Volts, I get nothing if I connect to both wires. If I connect to just (+) wire and then to the frame, I get 1.5 volts. If I just connect to the (-) wire and then to the frame, I get 1.5 volts.
When using a continuity test from the (-) wire to the frame, I heard the fuel pump pressurize. That doesn't happen with the (+) wire.
* (This is strange to me because I heard the fuel pump pressurize when I turned the ignition to "On".)
With the Negative Battery Terminal off, there is no continuity from either wire to the negative battery wire other grounding points.
I just unplugged the PCM wiring connector, The (+) wire does have continuity for the #21 pin and the (-) has continuity for the #22 pin.
I don't understand why I'd get the 1.5 volts from both the positive and negative wires. I also don't understand why I'd get the fuel pump to pressurize when I connect the negative wire to the frame.
Any ideas?
Thanks ,
Dave
I have a Crank, No Spark, problem and I'm chasing wires. I already replaced the Crankshaft Position Sensor with a new one and I bench tested it to make sure it worked. I do get AC voltage when passing a piece of metal in front of it. The Ohms were 660. (If I read that right. .660 K)
Now I'm checking the wires. The CKP is not installed right now.
With the wiring clip disconnected from the CKP, I put sewing needles into each of the two connections, then used the alligator clips on my multimeter to test it. There is a blue wire that is supposed to be the positive wire and a grey one that is supposed to be negative.
With the multimeter set to DC Volts, I get nothing if I connect to both wires. If I connect to just (+) wire and then to the frame, I get 1.5 volts. If I just connect to the (-) wire and then to the frame, I get 1.5 volts.
When using a continuity test from the (-) wire to the frame, I heard the fuel pump pressurize. That doesn't happen with the (+) wire.
* (This is strange to me because I heard the fuel pump pressurize when I turned the ignition to "On".)
With the Negative Battery Terminal off, there is no continuity from either wire to the negative battery wire other grounding points.
I just unplugged the PCM wiring connector, The (+) wire does have continuity for the #21 pin and the (-) has continuity for the #22 pin.
I don't understand why I'd get the 1.5 volts from both the positive and negative wires. I also don't understand why I'd get the fuel pump to pressurize when I connect the negative wire to the frame.
Any ideas?
Thanks ,
Dave