P0045-BOOST PRESSURE SOLENOID OPEN CIRCUIT
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on and the ECM Boost Pressure Solenoid command off.
- Set Condition:
The ECM does not detect voltage on the Boost Pressure Solenoid Control circuit.
| Possible Causes |
| ASD RELAY OUTPUT CIRCUIT OPEN |
| BP SOLENOID CONTROL CIRCUIT SHORTED TO GROUND |
| BP SOLENOID CONTROL CIRCUIT OPEN |
| BOOST PRESSURE SOLENOID |
| ENGINE CONTROL MODULE |
Diagnostic Test
1. CHECK FOR ACTIVE DTCNOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Test drive the vehicle.
Monitor the scan tool for ECM DTCs.
Did this DTC set again?
Yes
- Go To2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2. CHECKING FOR OTHER DTCS
NOTE: An open ASD power supply to the ECM will cause multiple DTC's including this DTC to set.
NOTE: Check the ECM for other DTC's. If other DTC's are set with this DTC refer to the symptom list and perform the CHECKING THE ECM POWER AND GROUND CIRCUITS test before continuing.
Are the ECM power and ground circuits are functioning properly?.
Yes
- Go To3
No
- Repair the ECM power and ground circuits. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3. ASD OUTPUT CKT OPEN
Turn the ignition off.
Disconnect the BP Solenoid harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit at the BP Solenoid harness connector.
Does the test light illuminate brightly?
Yes
- Go To4
No
- Repair the ASD Relay Output circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4. BP SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the BP Solenoid Control circuit.
Is the resistance above 1000 ohms?
Yes
- Go To5
No
- Repair the BP Solenoid Control circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5. BP SOLENOID CONTROL CIRCUIT OPEN
Measure the resistance of the BP Solenoid Control circuit.
Is the resistance below 10.0 ohms?
Yes
- Go To6
No
- Repair the BP Solenoid Control circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
6. BOOST PRESSURE SOLENOID
Turn the ignition off.
Install a substitute BP Solenoid in place of the vehicle's BP Solenoid.
NOTE: Ensure the ECM and BP Solenoid harness connectors are connected.
Turn the ignition on.
With the scan tool, check for this DTC to set again.
Did this DTC set again?
Yes
- Replace and program the Engine Control Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Replace the Boost Pressure Solenoid.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).