Chart C-2A Injector Coil Test Procedure

Chart C-2A: Injector Coil Test Procedure:

Part 1 of 3

Chart C-2A: Part 2 Of 3:

Part 2 of 3

Chart C-2A: Injector Balance Test Procedure:

Part 3 of 3

Injector Coil Test Equipment:

Circuit


CIRCUIT DESCRIPTION Part 1 of 3
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This is the set-up step for performing the injector coil test. Also read instructions included with tools used for test.
2. Engine coolant temperature affects the tool's ability to detect a faulty injector. If engine coolant temperature is NOT between 50°F and 95°F the comparison chart (Part 2 of 3) must be used.

Chart C-2A: Injector Pressure Drop Procedure:

Example



3. The first second of the voltage reading may be inaccurate due to initial current surge, therefore, record the lowest voltage displayed after the first second of the test. The voltage reading should be within range (see example). The voltage reading may increase throughout the test as the injector windings warm and the resistance changes. An erratic voltage reading (one that jumps up and down) indicates an intermittent connection within the fuel injector.
4. To check the mechanical (fuel delivery) portion of the fuel injector, perform an injector balance test.



CHART TEST DESCRIPTION Part 2 of 3
Number(s) below refer to circled number(s) on the diagnostic chart.

1. The first second of the voltage reading may be inaccurate due to initial current surge, therefore, record the lowest voltage displayed after the first second of the test. The voltage reading may increase throughout the test as the injector windings warm and the resistance changes. An erratic voltage reading (one that jumps up and down) indicates an intermittent connection within the fuel injector.
2. From recorded voltages (see example), identify the highest voltage reading recorded (other than those above 9.5 volts). Subtract all other voltages from the highest voltage recorded The subtracted value for any injector must not exceed 0.6 volts.
3. To check the mechanical (fuel delivery) portion of the fuel injector, perform an injector balance test.




CHART TEST DESCRIPTION Part 3 of 3
Number(s) below refer to circled number(s) on the diagnostic chart.

1. Engine cool down period (10 minutes) is necessary to avoid irregular fuel pressure readings due to "Hot Soak" fuel boiling.
2. Energize tester one time and record pressure drop at the lowest point (Disregard any slight pressure variations).
3. If the pressure drop of all injectors is within 10 kPa (1.5 psi) of the average fuel pressure drop, the injectors are flowing properly. The actual amount of pressure drop is calculated by subtracting the second pressure reading from the first pressure reading.