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

Diagnostic Chart:

CIRCUIT DESCRIPTION
The PCM controls the fuel injector control circuit using a Multifunction Driver (MFD). Power is supplied by the injector fuse to the injector and is grounded by the PCM. The MFD controls the injector ground, allowing fuel flow to pulse.

DIAGNOSTIC AIDS
Test the engine fuel injection harness for the following conditions:
^ Poor Terminal Connection-Inspect the harness connectors for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Faulty terminal to wire connection- Use a corresponding mating terminal to test for proper tension.
^ Intermittents-Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Diagrams.
^ Damaged harness-Inspect the wiring harness for damage. Refer to Wiring Repairs in Diagrams.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. The engine coolant temperature affects the resistance in the fuel injector and the ability of the fuel injector tester to detect a faulty fuel injector. If the engine coolant temperature is between the specified value, go to Fuel Injection Coil Test - ECT Between 10°C-35°C. 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. 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 (large fluctuations in voltage that does 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. A fuel injector with a recorded voltage above 9.5 volts is also considered faulty and must be replaced.
4. Subtract each voltage from the highest recorded voltage below 9.5 volts. 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 greater than the specified value is considered faulty and must be replaced.