GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Express 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Fuel Injector Solenoid Coil Test

Object Number: 35909 Size: MF

Test Description

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

  1. This step is used to set up the injector coil test. Also read the instructions included with the tools used for this test.

    2.

  2. Engine coolant temperature affects the tool's ability to detect a faulty injector. If the engine coolant temperature is not between 50°F and 95°F, allow the vehicle to warm or cool as necessary.

    3.

  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. The voltage reading may increase throughout the test as the injector windings warm up and the resistance changes. An erratic voltage reading would indicate an intermittent connection within the fuel injector.

Step

Action

Value(s)

Yes

No

1

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

Caution: The fuel pump will operate for 2 seconds after you have turned off the ignition. Make sure that all the fuel pipes and fittings are securely fastened in order to prevent personal injury.

  1. Turn OFF the engine.
  2. Relieve the fuel pressure. Refer to Fuel Pressure Relief .
  3. Connect the fuel injector tester J 39021 to B+.
  4. Connect the injector switch box J 39021-210 .
  5. Set the amperage supply selection to the 0.5 amp position.
  6. Connect the leads from a digital multimeter (DMM) set to the tenths scale (0.0).
  7. Connect the scan tool.
  8. Monitor the engine coolant temperature.

Is the engine coolant temperature within the specified range?

10°-35°C

Go to Step 4

Go to Step 3

3

Allow the engine to warm or cool as necessary.

Is the engine coolant temperature within the specified range?

10°-35°C

Go to Step 4

--

4

Important: Perform the following test for each injector.

  1. Press the Push To Start Test button.
  2. Monitor the DMM.

Important: The voltage may increase during the test. Watch for erratic readings.

Are any of the injector voltage readings outside the specified range?

5.44-7.53 V

Go to Step 5

Go to Fuel Injector Balance Test with Tech 2

5

Replace the fuel injector and poppet nozzle assembly that was not within the specified range. Refer to Fuel Injector Replacement .

Is the action complete?

5.44-7.53 V

Go to Step 6

--

6
  1. Using the scan tool, select the DTC and the Clear Info functions.
  2. Attempt to start the engine.

Does the engine start and continue to run?

--

Go to Step 7

Go to Step 2

7
  1. Allow the engine to idle until the engine reaches a normal operating temperature.
  2. Select the DTC and the Failed This Ign functions on the scan tool.

Are any DTCs displayed?

--

Go to the applicable DTC table

Go to Step 8

8

Use the scan tool in order to display the Capture Information and the Review Capture Information functions.

Are any DTCs displayed that have not been diagnosed?

--

Go to the applicable DTC table

System OK