ECT Outside 10-35 Degrees C (50-95 Degrees F)

Diagnostic Chart:

Schematic:

TEST DESCRIPTION

CAUTION: Refer to Shop Towel Fuel Leak Caution in Service Precautions.

2. The Engine Coolant Temperature affects the ability of the fuel injector tester to detect a faulty fuel injector.
3. The first second of the voltage displayed by the DMM may be inaccurate due to the initial current surge. Therefore, record the lowest voltage displayed by the DMM after the first second of the test. The voltage displayed by the DMM may increase throughout the test as the fuel injector windings warm and the resistance of the fuel injector windings change. An erratic voltage reading indicates an intermittent connection within the fuel injector. From the voltages recorded, identify the highest voltage, excluding any voltages of more than 9.5 volts. Subtract each voltage that is not more than 9.5 volts from the highest voltage. Record each subtracted value. Refer to the example. The subtracted value for any fuel injector must not exceed 0.8 volt. A fuel injector with a subtracted value that is more than 0.6 volt is considered faulty and must be replaced. A fuel injector with a recorded voltage of more than 9.5 volts is also considered faulty and must be replaced.