Grand AM V6-3100 3.1L MFI VIN M (1994)
Injector Tester Hook-up
Typical Injector Resistance Readings
TEST DESCRIPTION
Numbers below refer to circled numbers on 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.
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 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.
Part 2 of 2
