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. If the engine coolant temperature is between 10°C and 35°C (50°F to 95°F), refer to Fuel Injector Coil Test - Engine Coolant Temperature (ECT) Between 10° - 35°C (50° - 95°F). Component Tests and General Diagnostics

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 warn and the resistance of the fuel injector windings change. An erratic voltage reading large fluctuations in voltage that do not stabilize indicates an intermittent connection within the fuel injector. From the voltages recorded, identify the highest voltage, excluding any voltages above 9.5 volts. Subtract each voltage that is not above 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 0.6 volt. A fuel injector with a subtracted value that is more than 0.6 volt is faulty. Replace the fuel injector. A fuel injector with a recorded voltage above 9.5 volts is also faulty. Replace the fuel injector.