GM Service Manual Online
For 1990-2009 cars only

Circuit Description

Ignition voltage is supplied directly to the solenoid. The control module supplies the ground path to the solenoid control circuit via an internal solid state device called a driver. Each driver has a fault line which is monitored by the control module. When the control module commands the solenoid ON, the voltage on the control circuit should be low, near 0 volts. When the control module commands the solenoid OFF, the voltage on the control circuit should be high, near battery voltage. If the fault detection circuit senses a voltage other than what is expected, this diagnostic trouble code (DTC) will set.

The control module will monitor the control circuit for the following conditions:

    â€¢ A short to ground
    â€¢ A short to voltage
    â€¢ An open circuit
    â€¢ An open solenoid
    â€¢ An internally shorted or excessively low resistance solenoid

Conditions for Running the DTC

    â€¢ The engine is running for more than 30 seconds.
    â€¢ The system voltage is between 9-18 volts.

Conditions for Setting the DTC

    â€¢ The control module detects an improper voltage level on the control circuit.
    â€¢ The condition exists for more than 30 seconds.

Action Taken When the DTC Sets

    â€¢ The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
    â€¢ The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

    â€¢ The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    â€¢ A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
    â€¢ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
    â€¢ Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

Notice: Do not operate the AIR pump for more than 60 seconds. Continuous operation of the AIR pump in excess of 60 seconds will damage the AIR pump.

Important: Use the J 35616 connector test adapter kit for any test that requires probing the following items:

   â€¢ The PCM harness connectors
   â€¢ The electrical center fuse/relay cavities
   â€¢ The component terminals
   â€¢ The component harness connector
Using this kit will prevent damage caused by the improper probing of connector terminals.

If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set. Also refer to Intermittent Conditions in Wiring Systems.

Test Description

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

  1. Listen for an audible click when the solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.

  2. This step tests for voltage at the feed.

  3. This step verifies that the control module is providing a ground.

  4. This step tests if ground is constantly being applied.

Step

Action

Yes

No

Schematic Reference: Engine Controls Schematics

1

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

  1. Turn ON the ignition.
  2. Use a scan tool in order to command the AIR solenoid ON and OFF.

Does the solenoid turn ON and OFF with each command?

Go to Diagnostic Aids

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the solenoid.
  3. Turn ON the ignition.
  4. Probe the feed circuit with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 10

4

  1. Connect a test lamp between the control circuit and the feed circuit.
  2. Use a scan tool in order to command the AIR solenoid ON and OFF .

Does the test lamp turn ON and OFF with each command?

Go to Step 8

Go to Step 5

5

Does the test lamp remain illuminated with each command?

Go to Step 7

Go to Step 6

6

Test the control circuit for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 9

7

Test the control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 9

8

Test for poor connections at the solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 11

9

Test for poor connections at the control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 12

10

Repair the open or short to ground in the feed circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

--

11

Replace the solenoid. Refer to Secondary Air Injection Vacuum Control Solenoid Valve Replacement .

Did you complete the replacement?

Go to Step 13

--

12

Replace the PCM. Refer to Powertrain Control Module Replacement .

Did you complete the replacement?

Go to Step 13

--

13

  1. Use the scan tool in order to clear the DTCs .
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC run and pass?

Go to Step 14

Go to Step 2

14

With a scan tool, observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

Go to Diagnostic Trouble Code (DTC) List

System OK