To start the process of diagnosing, we need to first bridge the terminals 'TE1' and 'E1' in the diagnosis box. This engine uses the flashing engine check light method to view the faults. The first flashes are 10's and the second flashes are 1's.
When the terminals are bridged, we then turn the ignition on and we found, after a number of flashes of the check light, our fault locations were the water temp circuit, the intake air temp circuit, and the vacuum sensor circuit. To check the water temp sensor, we should test the wiring for available voltage or open circuit. If that is good, we would then remove the water temp sensor and test the resistance as we gradually heat it up. If the values are within spec, it is ok. To check the air temp sensor, we would first check the wiring for available voltage/open circuit. If that is ok, we would then remove the air temp sensor and test the resistance as we heat it up. If these values are in spec, the component is ok.
To test the MAP sensor, we would check wires for available voltage etc, and then we would apply a vacuum with a vacuum pump, and record the voltage drops. If this is within spec, the sensor is ok.
The vehicle EFI system is ok.
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