J2000/Sunbird V6-191 3.1L VIN T MFI (1994)
Fuel Injector Tester Circuit
Example
Test Description: 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 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 volt.
3. To check the mechanical (fuel delivery) portion of the fuel injector, perform an injector balance test.
