GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Escalade 🢒 Engine 🢒 Engine Controls - 5.0L and 5.7L 🢒 Fuel Injector Solenoid Coil Test

Object Number: 35909 Size: MF

Test Description

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

  1. This step is used to set up the injector coil test. Also read the instructions included with the fuel injector tester.

    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 (one that jumps up and down) would indicate an intermittent connection within the fuel injector.

Step

Action

Value(s)

Yes

No

1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

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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+ and ground.
  4. Connect the injector switch box J 39021-210 and the J 39021-302 injector harness connector.
  5. Set the amperage supply selection to the 0.5 amp position.
  6. Connect the leads from J 39200 digital multi meter (DMM) to the fuel injector tester.
  7. Set the DMM to the tenths scale (0.0).
  8. Connect the scan tool.
  9. Monitor the engine coolant temperature.

Is the engine coolant temperature within the specified value?

10°-35°C (50°-95°F)

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 value?

10°-35°C

Go to Step 4

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4

Important: Perform the following test for each injector.

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

Important: Voltage may climb during the test. Watch for erratic readings (voltage that jumps up and down).

Do any of the injector voltage readings fall outside the specified value?

5.44-7.53V

Go to Step 5

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

5

Replace the fuel injector that was not within the specified value. Refer to Fuel Injector Replacement .

Is the action complete?

5.44-7.53V

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

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