P1252-VACUUM RESERVOIR SOLENOID SHORT CIRCUIT
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on and the ECM Vacuum Reservoir Solenoid command on.
- Set Condition:
The ECM detects a short to voltage on the Vacuum Reservoir Solenoid Control circuit.
| Possible Causes |
| INTERMITTENT CONDITION |
| ASD RELAY OUTPUT CIRCUIT OPEN |
| VACUUM RESERVOIR SOLENOID CONTROL SHORTED TO VOLTAGE |
| VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND |
| VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT OPEN |
| VACUUM RESERVOIR SOLENOID |
| ENGINE CONTROL MODULE |
Diagnostic Test
1. CHECK FOR ACTIVE DTCNOTE: IfINTERMITTENT CONDITIONe 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.
Perform several ignition cycles, turning the ignition off for at least 10 seconds between each ignition cycle.
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.
If the ECM power and ground circuits are functioning properly continue with this test.
Yes
- Go To3
3. 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.
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. VACUUM RESERVOIR SOLENOID CONTROL SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of the Vacuum Reservoir Solenoid Control circuit.
Is the voltage below 1.0 volt?
Yes
- Go To5
No
- Repair the Vacuum Reservoir Solenoid Control circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5. VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Remove the jumper wire and install the ASD Relay.
Measure the resistance between ground and the Vacuum Reservoir Solenoid Control circuit.
Is the resistance above 1000 ohms?
Yes
- Go To6
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).
6. VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT OPEN
Measure the resistance of the Vacuum Reservoir Solenoid Control circuit.
Is the resistance below 10.0 ohms?
Yes
- Go To7
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).
7. VACUUM RESERVOIR SOLENOID
Turn the ignition off.
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).