| Table 1: | Example |
Test Description
Caution: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete.
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The engine coolant temperature affects the ability of the fuel injector tester to detect a faulty fuel injector. If the engine coolant temperature is between 10°C-35°C (50°F-95°F), refer to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F) .
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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 of the test. 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 do 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. Subtract each voltage that is not above 9.5 volts from the highest voltage. 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 more than 0.6 volt is faulty. Replace the fuel injector. A fuel injector with a recorded voltage above 9.5 volts is also faulty. Replace the fuel injector.
Highest Voltage Reading | Acceptable Subtracted Value Above/Below 10°C-35°C (50°F-95°F) | ||
|---|---|---|---|
7.1 V | 0.6 V | ||
Injector Number | Voltage | Subtracted Value | Pass/Fail |
1 | 9.8 | -- | F |
2 | 6.6 | 0.5 | P |
3 | 6.9 | 0.2 | P |
4 | 5.8 | 1.3 | F |
5 | 7.0 | 0.1 | P |
6 | 7.1 | 0.0 | P |
7 | 9.6 | -- | F |
8 | 6.0 | 1.1 | F |
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||||||||
Is the engine coolant temperature outside the specified limits? | 10°C-35°C (50°F-95°F) | |||||||||
Notice: In order to prevent flooding of a single cylinder and possible engine damage, relieve the fuel pressure before performing the fuel injector coil test procedure. Important: Check the engine coolant temperature again in order to ensure that the correct chart is being used. Important:: The voltage reading may rise during the test. Is any value that resulted from subtraction more than the specified value? | 0.6 V | Go to Fuel Injector Balance Test with Tech 2 or Fuel Injector Balance Test with Special Tool | ||||||||
4 | Replace any fuel injector that had any of the following:
Refer to Fuel Injector Replacement . Is the replacement complete? | -- | Go to Fuel Injector Balance Test with Tech 2 or Fuel Injector Balance Test with Special Tool | -- |
