GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Sonoma Pickup - 2WD 🢒 Engine 🢒 Engine Controls - 2.2L (L43) 🢒 Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F)
Table 1: Example

Object Number: 17707 Size: MF

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. The engine coolant temperature (ECT) effects the ability of the fuel injector tester to detect a faulty fuel injector. If the engine coolant temperature is NOT between 10-35°C (50-95°F), refer to Fuel Injector Coil Test Procedure-ECT Outside 10-35°C (50-95°F).

    2.

  2. 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 should be within the specified range. Refer to the Example. 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 changes. An erratic voltage reading, such as large fluctuations in voltage that do not stabilize, indicates an intermittent connection within the fuel injector.

Resistance Ohms

Voltage Specification at 10-35°C (50-95°F)

1.95-2.3

4.7-5.8

Fuel Injector Number

Voltage Reading

Pass/Fail

1

5.3

P

2

4.9

P

3

5.2

P

4

4.3

F

Example

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System Check-Engine Controls?

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Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

  1. Install the scan tool.
  2. Check the engine coolant temperature.

Is the engine coolant temperature within the specified limits?

10-35°C (50-95°F)

Go to Step 3

Go to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Outside 10-35 Degrees C (50-95 Degrees F)

3

  1. Turn OFF the ignition .

    2. 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.

  2. Relieve the fuel pressure. Refer to Fuel Pressure Relief .
  3. Access the fuel injector electrical connectors as required.
  4. Connect the fuel injector tester to B+ and ground.
  5. Set the amperage supply selector switch on the fuel injector tester to the Coil Test 2.5 amp position.
  6. Connect the leads from the voltmeter to the fuel injector tester.
  7. Set the DMM to the tenths scale (0.0).
  8. Connect the fuel injector tester to a fuel injector.

    9. Important: Check the engine coolant temperature again to ensure that the correct chart is being used.

  9. Press the push to start test button on the fuel injector tester.

    10. Important : The voltage reading may rise during the test.

  10. Observe the voltage reading on the DMM.
  11. Record the lowest voltage observed after the first second of the test.
  12. Repeat steps 8 through 12 for each fuel injector.

    13. Did any fuel injector have an erratic voltage reading (large fluctuations in voltage that do not stabilize) or a voltage reading outside of the specified limits?

4.7-5.8 V

Go to Step 4

Go to Fuel Injector Balance Test with Special Tool or Fuel Injector Balance Test with Tech 2

4

Replace the malfunctioning fuel injectors. Refer to Fuel Injector Replacement .

Is the action complete?

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Go to Fuel Injector Balance Test with Special Tool or Fuel Injector Balance Test with Tech 2

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