Before performing a line pressure check, verify that the pressure control solenoid for the transmission is receiving the correct electrical signal from the vehicle computer:

1. Install a Scan Tool .

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

Notice: The transmission may experience harsh, soft or mushy shifts for up to two days later.

2. Start the engine and set the parking brake.
3. Check for diagnostic trouble codes, including the diagnostic code for a pressure control solenoid.
4. Repair the vehicle if necessary. Include the following areas:

•	Inspect the fluid level

•	Inspect the manual linkage at the transmission

•	Install or connect the scan tool

•	Install or connect the J 21867 at the line pressure tap

5. Put the gear selector in Park and set the parking brake.
6. Start the engine and allow the engine to warm up at idle.

1. Depress the brake pedal firmly. Increase the engine speed until a stall is attained. Run the transmission in the various modes (economy/sport/winter programs) and selector lever positions, as specified in the following table.

Important: The engine runs under the stipulated conditions at a specific stall speed (above 1500 RPM, approximately 2200 RPM). Under these conditions, the transmission fluid heats very rapidly; therefore, each individual test step must not last more than 5 seconds. If necessary, allow the transmission to cool down between each test. Put the selector lever in Neutral and allow the engine to idle for approximately 1 minute in order to cool the transmission down. Use the scan tool in order to monitor the transmission fluid temperature. Under the normal conditions, the transmission fluid temperature is in the range of 70-120°C (158-248°F).

2. Compare the scan tool value for the pressure control solenoid current consumption and the transmission fluid pressure from the pressure gauge with the relevant values in the Mode vs Pressure at Stall Speed Table below.
3. Once the check is completed, remove the J 21867 , insert the closure bolt and tighten to 14 N·m (10 lb ft).
4. If the specified pressure checks are not successfully completed, check the following transmission components for faults:

4.1.	The transmission fluid pump

4.2.	The pressure control solenoid valve

4.3.	The transmission fluid filter

4.4.	The fluid screen of pressure regulator

4.5.	The pressure limiting valve

4.6.	The throttle valve switch damaged

4.7.	The connection ducts between the above components