Question about 1994 Chevrolet S-10 Blazer

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Need wiring diagram for the ecm on a 94 chevy s10 with a 4.3 liter v6 throttle body injected. mainly location of power signal the goes to the fuel pressure oil switch.

Posted by leadsnake29 on

  • leadsnake29 Jul 28, 2011

    is this the same for a 1994 chevy s-10 with a 4.3liter?

  • leadsnake29 Jul 28, 2011

    thanks tested wire and i am not getting signal from the pcm to the fuel pump relay. checked fuse and it is good. do u think it is the pcm is bad or is there something else I should check.

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1 Answer

ZJ Limited

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  • Chevrolet Master
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Throttle Position Sensor (TPS) is connected to the throttle shaft on the throttle body. It is a potentiometer with one end connected to 5 volts from the VCM and the other to ground. A third wire is connected to the VCM to measure the voltage from the TPS. As the throttle valve angle is changed (accelerator pedal moved), the output of the TPS also changes. At a closed throttle position, the output of the TPS is low (approximately 0.5 volts). As the throttle valve opens, the output increases so that, at wide-open throttle, the output voltage should be approximately 4.5 volts. By monitoring the output voltage from the TPS, the VCM can determine fuel delivery based on throttle valve angle (driver demand).

need wiring diagram for the ecm on a 94 chevy s10 - zjlimited_1639.jpg

Fig. 1: Common Throttle Position Sensor (TPS) wiring diagram (wire color, terminal identification/location may vary on certain models)


In addition, I send you some wiring diagrams that coud helpful (click image for zoom)...



Fig. 7: 1996 GM 4.3L Engine Schematic

zjlimited_1641.jpg

Fig. 10: 1996-1997 GM S10/Blazer Chassis Schematic

Hope this helps.

Posted on Jul 28, 2011

  • ZJ Limited
    ZJ Limited Jul 28, 2011


    Keep in mind that in both years, the S-10 Blazer using the 4.3 liter V-6 VIN "W".

  • ZJ Limited
    ZJ Limited Jul 29, 2011

    Sound like a internal problem in the PCM or total device go to bad. Will need to check internal micro-components.

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