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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old Today, 12:26 PM   #1 (permalink)
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OBD Port Not Working, Temp Gauge and Cluster Problems

I have been through the threads and search tool and am finally looking for help on how to proceed. Any thoughts on where to dig in first?

Truck runs great having no issues with performance. I lost my Wait To Start light and replaced both my temp sensors and the Glow Plug Controller (all AC Delco). Strange scenario of events have me scratching my head, must be electrical but not sure where...or my gauge cluster has gone bad.

Turn key to warm glow plugs before starting and get
- gauge needles don't sweep, they used to (right?)
- Service Engine light acts as the WTS light, it's lit as the glow plugs charge- can see / hear from the voltage gauge. Service Engine light turns off when glow plugs stop.

Temp gauge won't budge from 0/100
- I jumped the temp sensor plug on the left side by manifold, nothing happened but the Service Engine light remained on

(A coolant leak started yesterday from the threads-side of the quick disconnect hose at the crossover, haven't lost much coolant. Haven't check coolant level yet, haven't gotten a Low Coolant light either. Looking at that today.)

Not Getting any response when putting paper clip in the OBD port. I am going to disconnect battery to reset computer and see if anything comes back.

1994 GMC 3500 4x4 crew cab dually, 1 ton
166k miles

Optimizer Engine 6/18
Heath Diesel Lift Pump 6/18
Heath Diesel eProm 6/18
Heath Diesel Turbo 6/18
S&B Intake 6/18
Water Pump / Radiator 6/18
Pillar Gauges 6/18
PMD relocated to bumper 12/12
Diamond Eye 4" exhaust 12/13
2 New Interstate Batteries 1/17
New Turbo Solenoid 1/13
BFG ATs 12/12
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Old Today, 01:13 PM   #2 (permalink)
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Join Date: May 2005
Location: Very south TEXAS, Formerly Wisconsin
Posts: 3,755
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There is a ground wire just above the DLC on the metal dash frame.
Make sure it is clean and tight.
When you unplug the ECT sensor on the front of the drivers head, the temp gauge should peg max temp, with key on. When you ground it you should get "0".

There are 10 kinds of people in this world; Those who understand binary and those who don't.

99 CREW LONG SRW C3500 work truck 199k+ mi. orig. motor & trans 4.10, modded engine harness, new oil cooler & lines, all new front end parts and poly bushings, trans poly mount, all new brakes.
96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine & main harness, converted to OBD2, PMD to bumper...
95 C1500 Suburban 6.5td rebuild tranny, convert to DB2, replacing as many parts as I can.
96 C2500 Suburban 7.4L converting to 6.5td w/ DB2, 4L80, 3.73
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