P2527-VACUUM RESERVOIR SOLENOID SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on and the ECM Vacuum Reservoir Solenoid command off.
- Set Condition:
The ECM detects a short to ground on the Vacuum Reservoir Solenoid Control circuit.
| Possible Causes |
| INTERMITTENT CONDITION |
| ASD RELAY OUTPUT CIRCUIT OPEN |
| VR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND |
| VR SOLENOID CONTROL CIRCUIT OPEN |
| VACUUM RESERVOIR 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.
Start the engine several times, turning the ignition off for at least 10 seconds between engine run cycles.
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. ASD OUTPUT CKT OPEN
Turn the ignition off.
Disconnect the Vacuum Reservoir Solenoid harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit at the Vacuum Reservoir Solenoid harness connector.
Does the test light illuminate brightly?
Yes
- Go To3
No
- Repair the ASD Relay Output circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3. VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Vacuum Reservoir Solenoid Control circuit at the Vacuum Reservoir Solenoid harness connector.
Is the resistance above 1000 ohms?
Yes
- Go To4
No
- Repair the Vacuum Reservoir Solenoid Control circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4. VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT OPEN
Measure the resistance of the Vacuum Reservoir Solenoid Control circuit between the Vacuum Reservoir Solenoid harness connector and the ECM harness connector.
Is the resistance below 10.0 ohms?
Yes
- Go To5
No
- Repair the Vacuum reservoir Solenoid Control circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5. VACUUM RESERVOIR SOLENOID
Install a substitute Vacuum Reservoir Solenoid in place of the vehicle's Vacuum Reservoir Solenoid.
NOTE: Ensure the ECM and Vacuum Reservoir 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 Vacuum Reservoir Solenoid.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).