Question about 1993 Chevrolet S-10 Blazer
Did you check the circuit where it comes out of the computer to see if it is too high ? Could be a short in the harness.
I think the gray is power and the dark blue is the signal back to the computer.
Posted on Apr 22, 2013
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Posted on Jan 02, 2017
Have you consider to check the battery power. I believe the main problem you have is either the battery or the alternator. Due to these two things with low voltage the brain ( ECU ) does not have the enough power to work. Good Luck.
Posted on Aug 15, 2012
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Fig. Fig. 3: Location of the MAP sensor-TBI system shown
Fig. Fig. 4: Probe the terminals of the MAP sensor to check for proper reference voltage
Fig. Fig. 5: Manifold Absolute Pressure (MAP) sensor wiring diagram
TPS TESTINGSee Figures 2, 3 and 4
Fig. Fig. 2: Using a DVOM, backprobe terminals A and B of the TPS sensor to check for proper reference voltage
Fig. Fig. 3: Using the DVOM, backprobe terminals C and B of the
TPS sensor, open and close the throttle and make sure the voltage
Fig. Fig. 4: Throttle Position Sensor (TPS) wiring diagram
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A P0123 code means that the computer has detected that the TPS (throttle position sensor) is reporting too high a voltage.
Symptoms may include:
A code P0123 may mean that one or more of the following has happened:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, carefully inspect all wiring and connectors that lead to the TPS. More than likely the problem is with the TPS wiring. Check the voltage at the TPS (refer to a service manual for your vehicle for this specific information). If the voltage spikes or is too high (over 4.65 volts with key on, engine off), then that is indicative of a problem. Carefully trace each wire from the TPS wiring harness to check for breaks, rubbing against other components, etc.
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