Chart A-8 Injector Coil Test Procedure

Chart A-8 Injector Coil Test (1 Of 2):

Chart A-8 Injector Coil Test (2 Of 2):

Injector Coil Test:

Chart Test Description
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 in NOT between 50°F and 95°F allow vehicle to warm or cool off first.

Injector Coil Specifications (1 Of 2):

3. Due to a current surge, the first second of the voltage reading may be inaccurate, therefore, begin recording after the first second of the voltage reading. The voltage specification 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.

5. Due to a current surge, the first second of the voltage reading may be inaccurate, therefore, begin recording after the first second of the voltage reading. 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.

Injector Coil Specifications (2 Of 2):

6. From recorded voltages (see example), identify the highest voltage reading recorded (other than those above 6.5 volts). Subtract all other voltages from the highest voltage recorded. The range for any injector must not exceed .55 volt (0.55 in example).

7. To check the mechanical (fuel delivery) portion of the fuel injector, perform an injector balance test.