2001 Chevy S-10 No 12V to fuel Pump Relay and temp gage abo

2001 CHEVROLET S-10

98,000 MILES • 4 CYL • 2WD • MANUAL

MIKE52D

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I have been working on this truck for two weeks now. Here is what I know: 12V at Batt. With no key in temp gauge reads over 100. Hit the odometer switch and the temp gauges falls back to 0. This is due to a lose of the class two data signal to What and where? With the ignition in the on position the fuel pump realy power as 0 volts for the coil. I have jumped the 12V straght to the pump ( Pump runs but no start ) Currently I have the Dash apart hopping to come across a lose wire. No such luck. I bought this truck for $1500 its very clean but i have not drove it yet! PLS HELP!

Mar 29, 2010 at 4:01 PM

MATHIASO

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Hello Mike52d 12.68v . . . . . . . . . . 100% 12.45v . . . . . . . . . . 75% 12.24v . . . . . . . . . . 50% 12.06v . . . . . . . . . . 25% 11.89v . . . . . . . . . . 0% 1) You have less that 25% of battery voltage, that is not enough to start the car. All class 2 data are connected from the ignition side of the logic through the gauges and grounded back to the pcm. Check the fuel pump prime connector c3, located just after the fuel relay in fuse block under hood. The ground might be good because when jumped, it run. Class 2 data signal wires

fuel pump relay and connections.

if the relay is good ,check the crank sensor, computer look for that signal to activate the relay. (I'm sending the diagrams to your email)

Mar 29, 2010 at 9:10 PM