GM Service Manual Online
For 1990-2009 cars only

Circuit Description

Output driver modules (ODM) are used by the powertrain control module (PCM) to turn ON many of the current-driven devices that are needed to control various engine and transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. Unlike the quad driver modules (QDM) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. If the PCM detects an improper voltage level on the supercharger boost control solenoid control circuit, DTC P0243 sets.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

    • An improper voltage level has been detected on the boost control solenoid control circuit.
    • The above conditions are present for at least 30 seconds.

Action Taken When the DTC Sets

    • The control module stores the DTC information into memory when the diagnostic runs and fails.
    • The malfunction indicator lamp (MIL) will not illuminate.
    • The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
    • The driver information center, if equipped, may display a message.

Conditions for Clearing the DTC

    • A current DTC Last Test Failed clears when the diagnostic runs and passes.
    • A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
    • Clear the DTC with a scan tool.

Diagnostic Aids

Inspect for the following conditions:

    • A poor connection at the PCM or the boost control solenoid--Inspect the harness connectors for the following conditions:
       - Backed out terminals
       - Improper mating
       - Broken locks
       - Improperly formed or damaged terminals
       - Poor terminal to wire connection
    • The wiring harness for damage

If the harness appears to be OK, disconnect the PCM, turn ON the ignition and observe a voltmeter connected between the boost control solenoid control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the boost control solenoid. A change in voltage will indicate the location of the malfunction.

Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Test Description

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

  1. This test can detect a partially shorted coil which would cause excessive current flow. Leaving the circuit energized for 2 minutes allows the coil to warm up. When warm, the coil may open, and the amps drops to 0 or the coil may short, and the amps go above 800 mA.

  2. This step tests for a short to voltage on the control circuit.

Step

Action

Values

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

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Command the boost control solenoid ON and OFF using the scan tool.

Do you hear a click when you command the solenoid ON and OFF?

--

Go to Step 3

Go to Step 4

3

  1. Turn OFF the ignition.
  2. Disconnect the PCM connector containing the boost control solenoid control circuit. Refer to Powertrain Control Module Replacement .
  3. Turn ON the ignition, with the engine OFF.
  4. Use a DMM on the 10-amp scale, in order to measure current from the boost control solenoid control circuit in the PCM harness connector to ground for 2 minutes.

Does the current remain within the specified value?

0.05-0.8 A (50-800 mA)

Go to Diagnostic Aids

Go to Step 8

4

  1. Turn OFF the ignition.
  2. Disconnect the boost control solenoid.
  3. Turn ON the ignition, with the engine OFF.
  4. Use a DMM in order to measure the voltage between the boost control solenoid control circuit at the solenoid harness connector and a good ground.

Is voltage at the specified value?

0 V

Go to Step 5

Go to Step 10

5

  1. Turn OFF the ignition.
  2. Disconnect the boost control solenoid harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the control terminal and the ignition 1 voltage terminal of the boost control solenoid harness connector.
  5. Command the boost control solenoid ON and OFF using the scan tool.

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

--

Go to Step 8

Go to Step 6

6

  1. Turn ON the ignition, with the engine OFF.
  2. Probe the ignition 1 voltage circuit of the boost control solenoid harness connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

--

Go to Step 7

Go to Step 12

7

  1. Turn the ignition OFF.
  2. Reconnect the boost control solenoid.
  3. Disconnect the PCM connector containing the boost control solenoid control circuit. Refer to Powertrain Control Module Replacement .
  4. Turn ON the ignition, with the engine OFF.
  5. Probe the boost control solenoid control circuit in the PCM harness connector with a 3-amp fused jumper wire connected to a good ground. Refer to Using Fused Jumper Wires in Wiring Systems.

Does the solenoid operate (audible click)?

--

Go to Step 11

Go to Step 9

8

Inspect for a poor connection at the boost control solenoid harness connector and repair as necessary. Refer to Connector Repairs in Wiring Systems.

Did you find and correct a condition?

--

Go to Step 15

Go to Step 13

9

Repair the boost control solenoid control circuit for an open or short to ground. Refer to Wiring Repairs in Wiring Systems.

Did you complete the action?

--

Go to Step 15

--

10

Repair the boost control solenoid control circuit for a short to voltage. Refer to Wiring Repairs in Wiring Systems.

Did you complete the action?

--

Go to Step 15

--

11

Inspect for a poor connection at the PCM harness connector containing the boost control solenoid control circuit and repair as necessary. Refer to Connector Repairs in Wiring Systems.

Did you find and correct a condition?

--

Go to Step 15

Go to Step 14

12

Repair the open or short to ground in the boost control solenoid ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the action?

--

Go to Step 15

--

13

Replace the boost control solenoid. Refer to Boost Control Solenoid Replacement .

Did you complete the action?

--

Go to Step 15

--

14

Replace the PCM. Refer to Powertrain Control Module Replacement .

Did you complete the action?

--

Go to Step 15

--

15

  1. Clear the DTC with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

--

Go to Step 2

Go to Step 16

16

Observe the Capture Info with a scan tool.

Are there any DTC that have not been diagnosed?

--

Go to Diagnostic Trouble Code (DTC) List

System OK