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For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Monte Carlo 🢒 Engine 🢒 Engine Electrical 🢒 Fuel Injector Circuit Diagnosis

Fuel Injector Circuit Diagnosis for Chevrolet Monte Carlo 2004

Circuit Description

The control module enables the appropriate fuel injector on the intake stroke for each cylinder. An ignition 1 voltage is supplied directly to the fuel injectors. The control module controls each fuel injector by grounding the control circuit via a solid state device called a driver.

Diagnostic Aids
    • Monitoring the fuel injector circuit status with a scan tool, while moving the fuel injector harness, may help to isolate an intermittent condition.
    • Performing the Fuel Injector Coil Test may help isolate an intermittent condition. Refer to Fuel Injector Solenoid Coil Test .
    • For an intermittent condition, refer to Intermittent Conditions .

Test Description

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

  1. This step tests for a short to ground on the ignition 1 voltage supply circuit of the fuel injector.

    2.

  2. This step tests for an open ignition 1 voltage supply circuit between the injector fuse and a fuel injector electrical connector.

Step

Action

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views

1

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

Are any fuel injector DTCs set?

Go to DTC P0201, P0202, P0203, P0204, P0205, or P0206

Go to Step 3

3

Inspect the fuel injector fuse.

Is the fuel injector fuse open?

Go to Step 4

Go to Step 5

4
  1. Turn OFF the ignition.
  2. Disconnect an electrical connector of a fuel injector.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition 1 voltage supply circuit of a fuel injector with a test lamp connected to B+.

Does the test lamp illuminate?

Go to Step 6

Go to Diagnostic Aids

5
  1. Turn OFF the ignition.
  2. Disconnect an electrical connector of a fuel injector.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition 1 voltage supply circuit of the fuel injector with a test lamp connected to a good ground.

Does the test lamp illuminate?

Go to DTC P0341

Go to Step 7

6
  1. Test the ignition 1 voltage supply circuit of each fuel injector for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  2. Replace the fuse.

Did you complete the action?

Go to Step 8

--

7

Repair the open or poor connection in the ignition 1 voltage supply circuit of the fuel injectors. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3