Question about 1994 Isuzu Rodeo
The normal way that injectors are controlled is via the permanent application (ignition on obviously) to one side of the coil that operates the enclosed piston, and the precisely timed application of ground (negative) to the other side of the coil. The transistors that control this switching under the command of the engine computer are typically contained within the computer itself. Measuring the voltage at the injectors is not productive since the common multimeter is incapable of detecting the very short pulses that activate the coil. Some kind of visual means would be needed to observe this pulse such as an oscilloscope or an engine analyzer equipped with a 'scope.
It's unlikely that all of the switching transistors (or the injectors) have failed simultaneously so either the computer has a problem or there is no fuel being delivered to the fuel rail that feeds the injectors. You should find a pressure regulator that sits between the fuel line coming from the tank that controls the fuel pressure for the injectors. This device seem to be a sore point in many vehicles and can make it appear that the injectors are not working. Many fuel rails have a fitting similar to a tire valve to allow the testing of the pressure being delivered. I would recommend you check this before assuming that the injectors are at fault.
Posted on Aug 27, 2010
The only other options I can tell you to do is the following:
1. Check your Vehicle speed sensor, this is mounted on your transmission.
2. Check that the wiring from the PCM to the injectors is ok.
3. Check the wiring from the VSS is also ok.
4. Check your camshaft position sensor as this also initiates the injector pulse on start up.
Check these areas and let me know if there is any more information you need.
Posted on Aug 27, 2010
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Posted on Jan 02, 2017
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