Volt

Line Pressure Check

Special Tools

EN 21867-A Pressure Gauge

For equivalent regional tools refer to Special Tools

Warning: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.

1. Install a scan tool.

Note: Depending on the hybrid/EV battery state of charge the engine may not start. To start or keep the engine running open the hood.

2. Start the engine.
3. If the engine will not start, refer to Engine Cranks But Does Not Run .
4. Inspect the transmission for the proper fluid level. Refer to Transmission Fluid Level and Condition Check .
5. Inspect the manual linkage at the transmission for proper function.
6. Turn the engine OFF.

Warning: When the transmission is at operating temperatures, take necessary precautions when removing the auxiliary pump pressure test hole plug, to avoid being burned by the catalytic converter.

Note: You may need to remove or disconnect components in order to gain access to the transmission line pressure test hole plug.

7. Remove the line pressure test hole plug.
8. Install the EN 21867-A pressure gauge .
9. Access the Scan Tool Transmission Output Controls for the Line Pressure Control Solenoid.
10. Start the engine.

Note: In order to achieve accurate line pressure readings, the following procedure must be performed at least 3 times in order to gather uniform pressure readings. Also if you do not have the hood open the engine may go in to AutoStop.

The scan tool is only able to control the line Pressure Control solenoid in PARK and NEUTRAL with engine speeds below 1500 RPM. This protects the clutches from extreme high or low line pressures.
11. Use the scan tool to increase and decrease the Line Pressure Control Solenoid in increments of approximately 100 kPa (15 psi). The scan tool commands the increment values automatically.
12. Allow the pressure to stabilise between increments.
13. Compare your pressure readings on the scan tool to those indicated on the EN 21867-A pressure gauge . Refer to Solenoid Valve Pressure Specifications .
14. If the pressure readings vary greatly, refer to Main Fluid Pump Pressure High or Low

1. Close the hood and wait for the engine to shut off.
2. Use the scan tool to increase and decrease the line pressure control solenoid in increments of approximately 100 kPa (15 psi). The scan tool commands the increment values automatically.
3. Allow the pressure to stabilise between increments.
4. Compare your pressure readings on the scan tool to those indicated on the EN 21867-A pressure gauge . Refer to Solenoid Valve Pressure Specifications .
5. If the pressure readings vary greatly, refer to Auxiliary Fluid Pump Pressure High or Low .
6. Turn the engine OFF.
7. Remove the EN 21867-A pressure gauge .

Caution: Refer to Fastener Caution in the Preface section.

8. Install the pressure test hole plug. Tighten the pressure plug to 11 N·m (97 lb in).