Circuit Description
The supercharger boost pressure is monitored and regulated under various engine operating conditions. The powertrain control module (PCM) controls the boost pressure using an output driver module (ODM) and the supercharger boost control solenoid. The supercharger boost control solenoid is connected inline with a vacuum hose, which when commanded, allows boosted air pressure to flow to the bypass valve actuator, opening the bypass valve and reducing supercharger boost pressure. Power to the solenoid is supplied through a fuse. The ground circuit is controlled through the ODM. The PCM is capable of monitoring the voltage level on an ODM circuit. 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
| • | For further system diagnosis, refer to Boost Control System Diagnosis . |
| • | If the condition is intermittent, refer to Intermittent Conditions . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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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, causing the amperage to drop to 0 or the coil may short, causing the amperage to rise above 800 mA.
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This step tests for a short to voltage on the control circuit.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics or Boost Control System Description 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 | |
2 |
Do you hear a click when you command the solenoid ON and OFF? | -- | Go to Step 3 | Go to Step 4 |
Does the current remain within the specified value? | 0.05-0.8 A (50-800 mA) | Go to Diagnostic Aids | Go to Step 8 | |
Is voltage at the specified value? | 0 V | Go to Step 5 | Go to Step 10 | |
5 |
Does the test lamp turn ON and OFF with each command? | -- | Go to Step 8 | Go to Step 6 |
6 |
Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 12 |
7 |
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 |
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? | -- | System OK | |
