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Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3304
Experience:  ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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Have a Detroit Series 60 in a 94 Peterbilt with the stop

Customer Question

Have a Detroit Series 60 in a 94 Peterbilt with the stop engine light on. Pulls codes 14, 16, 25 and 43. Replaced bottom sensor on the back drivers side of the engine second one down, oil temp? has a straight two prong plug on it. When I unplug the one above it with the 90 degree 2 prong plug the check engine light comes on so guess that one is working OK. Coolant tank is full, replaced low coolant sensor in tank, topped off leaked fluid and light is still on. Are the coolant temp sensors one of the 3 on the passenger side of the engine toward the back on the head just above the exhaust manifold? Front two have single wire connections and the back one has a plug.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Customer: replied 1 year ago.
Oil pressure gauge reads fine, oil temp and coolant temp also read fine but Im thinking the computer may have different sensors that the gauges????
Expert:  Jeremy replied 1 year ago.

My name is ***** ***** I will assist you.

These all show the sensors as being in a high state. The issue will be in the harness somewhere. They are getting cross feed in or the plug going to the ECM is corroded, maybe even the ECM itself. Check the harness going to the ECM and see if it has oil pushing through it or coolant. Clean the ECM pins with electrical contact cleaner that you can get from the parts store and see if that helps. Otherwise, voltage test the pins at the sensors and see if you have higher than 5 volts on any of them. Then test the other pins for a full ground. If they are reading different, be ready to replace the harness if the ECM tests to be good.

HERE is a card for the codes for you.

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