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Tool Talk Discussion Forum

Re: OT chevy s 10 problems

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Author  [Modern View]

06-09-2014 16:40:44

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Need more info. What are the codes? The lowest numbered code is the one the needs fixed first. Does it run the same all the time or changes with engine speed or load. Define running rough. I would start with a tune up if that has not been done recently.

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06-09-2014 17:04:22

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 Re: OT chevy s 10 problems in reply to funky_g00, 06-09-2014 16:40:44  
codes are
14 coolant sensor
31 cam sensor
32 electronic vacuum regulator
33 map sensor
42 electronic spark
43 electronic spark control
51 computer
52 ecm fault
53 system voltage to high
54 fuel pump circuit fault
55 ecm fault

that is about everything under the sun. The truck runs sort of rough at idle. It smooths out when driving but after about 20 mins of driving will run real rough. thought maybe it was like something was breaking down after it heats up.
I hit the erase button on this code reader but doesn't erase like with the OBD II vehicles. How would I erase the codes? I thought when the battery was disconnected would do it but not.

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06-09-2014 17:30:22

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 Re: OT chevy s 10 problems in reply to bobpa, 06-09-2014 17:04:22  
What you need is an older scan tool that will let you read the sensors live. I have several of them that I have accumulated over the years.

The codes you list are hard faults. That means that they are present at the time of the test. It sounds as if you have a bigger problem with wiring harnesses and connectors. I might suggest that you start by unplugging them one at a time and looking for corrosion, broken wires, and pushed out terminals.

You are correct in that codes are not erasable as they are in OBD2. As I think about it, it occurs to me that your Vref (reference voltage) is not right. The system (sensors mainly) operate on a 5-volt reference voltage. Actuators usually operate on 12 volts. I would start by checking Vref on the TP sensor first, and then on the MAP sensor. If there is a discrepancy, trace back to the ECM and check for a corroded, pushed out, or broken connector or terminal.

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