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C15 reads no eng, wont fire,gives code 140. power at pins 70…

C15 reads no eng...

C15 reads no eng, wont fire,gives code 140. power at pins 70 52 53 and i thunk 55, but also has power at pins 63 65 67 and 69

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

2004 accert. i believe c15

Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far?

We checked all the pins at ecm connection all seems fine, but our schematic says 63 65 67 69 should be grounds, why do i have power there?

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Answered in 3 minutes by:
12/15/2020
Technician: Nich1019, Cummins/Caterpillar Technician replied 1 year ago
Nich1019
Nich1019, Cummins/Caterpillar Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 2,532
Experience: Expert
Verified
Hello and welcome to JustAnswer! I'm Nick and I'll be helping you out today. Can you provide the engine serial number or the last 6 of the VIN if this is a Peterbilt or KW truck?
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Customer reply replied 1 year ago
Acterrra can't read vinIts a c7 Cat
Technician: Nich1019, Cummins/Caterpillar Technician replied 1 year ago
Ok, give me a few minutes to pull a diagram and look up that fault code.
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Customer reply replied 1 year ago
Thanks, ***** ***** a fused white wire gnde1206, when we put power to it it we here noise in fuse block and get power at ground pins, but schematic we have says it's power supply to ecm
Technician: Nich1019, Cummins/Caterpillar Technician replied 1 year ago
Here is the schematic. Is this what you have already? You'll need the battery positives, grounds and ignition voltage for the ECM to turn on. The ignition pin is 70.
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Technician: Nich1019, Cummins/Caterpillar Technician replied 1 year ago
I don't see a 140 fault. Is the check engine light flashing? Can you count the flashes? It should be 2 digits.
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Customer reply replied 1 year ago
Check light doesn't come on, and have power at pins 70 when turn key, and 52 53 55 constantly
Technician: Nich1019, Cummins/Caterpillar Technician replied 1 year ago
If the light does not come on during initial key on then the ECM is likely faulty. You can verify this by installing a known good ECM, removing the ECM and taking it to a shop that has Cat software and a bench harness or by connecting to it on the vehicle with a bench harness.
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Customer reply replied 1 year ago
We have new one ordered, I will do some more digging and contact you tomorrow
Technician: Nich1019, Cummins/Caterpillar Technician replied 1 year ago
Ok sounds good. I'm a little confused about the grounds though. Those pins should definitely have battery ground.
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Customer reply replied 1 year ago
There is a fused wire at battery that sends power to pin 70 and it causes the ground to be live, is this supposed to be positive? We had someone unhook wires and couldn't remember where they wentCould there be s short in fuse block, it crackles when u hook that wire to positive
Technician: Nich1019, Cummins/Caterpillar Technician replied 1 year ago
it definitely sounds like a short in the wiring somewhere. I would try to isolate each circuit and check for continuity to ground or power. Something isn't right if the ground wires have power.
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Customer reply replied 1 year ago
Ok i will work on that tom, thank you very much
Technician: Nich1019, Cummins/Caterpillar Technician replied 1 year ago
You're welcome. Let me know what you find please.
Nich1019
Nich1019, Cummins/Caterpillar Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 2,532
Experience: Expert
Verified
Nich1019 and 87 other Medium and Heavy Trucks Specialists are ready to help you
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Customer reply replied 1 year ago
Ok
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