P0048-TURBOCHARGER BOOST CONTROL CIRCUIT SHORT CIRCUIT
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on and the Boost Pressure Servo Motor command on.
- Set Condition:
The Engine Control Module (ECM) detects that the (X653) Boost Pressure Servo Motor Control circuit is shorted to voltage for 2.0 seconds.
| Possible Causes |
| (X635) BOOST PRESSURE SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE |
| (X635) BOOST PRESSURE SOLENOID CONTROL CIRCUIT SHORTED TO THE (K347) FUSED ASD RELAY OUTPUT CIRCUIT |
| BOOST PRESSURE SOLENOID |
| ENGINE CONTROL MODULE (ECM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Diagnostic Test
1. DTC IS ACTIVEIgnition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the Boost Pressure Solenoid.
Monitor the scan tool for at least two minutes.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
- Go To 2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2. (X635) BOOST PRESSURE SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Boost Pressure Solenoid connector.
Disconnect the Engine Control Module (ECM) connector.
Remove the ASD Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.
Turn the ignition on.
Measure the voltage of the (X635) Boost Pressure Solenoid Control circuit in the Boost Pressure Solenoid harness connector.
Is there any voltage present?
Yes
- Repair the (X635) Boost Pressure Solenoid Control circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Go to 3
3. (X653) BOOST PRESSURE SOLENOID CONTROL CIRCUIT SHORTED TO THE (K343) FUSED ASD RELAY OUTPUT CIRCUIT
Turn the ignition off.
Measure the resistance between the (X635) Boost Pressure Solenoid Control circuit and the (K347) Fused ASD Relay Output circuit in the Boost Pressure Solenoid harness connector.
Is the resistance above 1000 ohms?
Yes
- Go to 4
No
- Repair the (X635) Boost Pressure Solenoid Control circuit for a short to the (K347) Fused ASD Relay Output circuit.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4. BOOST PRESSURE SOLENOID
Connect the Engine Control Module (ECM) connector.
Remove the jumper wire and install the ASD Relay
Turn the ignition on.
With the scan tool, Clear DTCs.
With the scan tool, actuate the Boost Pressure Solenoid to 100%.
Using a 12 volt test light connected to 12 volts, check the (X635) Boost Pressure Solenoid Control circuit in the Boost Pressure Solenoid harness connector.
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
NOTE: The circuit will remain actuated by the controller for 30 seconds. Be certain the actuation is active when checking the circuit.
With the scan tool, actuate the Boost Pressure Solenoid to 0%.
Using a 12 volt test light connected to 12 volts, check the (X653) Boost Pressure Solenoid Control circuit in the Boost Pressure Solenoid harness connector.
NOTE: The test light should not be illuminated.
NOTE: The circuit will remain actuated by the controller for 30 seconds. Be certain the actuation is active when checking the circuit.
Is the test light illuminated and bright with the actuation at 100% and not illuminated with the actuation at 0%?
Yes
- Replace the Boost Pressure Solenoid in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Go to 5
5. ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure Solenoid and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
- Repair as necessary.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Replace the Engine Control Module (ECM) in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).