Circuit/System Testing

WARNING: This page is about a different car, the 2008 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.

Operate the vehicle in 2nd gear. The engine should not stall when shifting into 2nd gear.
- Inspect and repair as necessary, the control valve body assembly for a stuck 3-4, 4-5 solenoid valve or a stuck U1 shift valve. Refer to the CONTROL VALVE BODY ASSEMBLY DISASSEMBLE .
Observe the scan tool Transmission OSS parameter while driving the vehicle. The reading should correspond to a known properly functioning OSS.
- If the OSS is malfunctioning, replace the Transmission Output Speed Sensor (OSS). Refer to the OUTPUT SPEED SENSOR REPLACEMENT .
Stop the vehicle, apply the parking brake, engine at idle, select P (park) using the Shift Control.
Observe the scan tool Transmission ISS parameter. The reading should be within 400-800 RPM.
- If the ISS parameter is not within the specified range, replace the Transmission Input Speed Sensor (ISS). Refer to the INPUT SPEED SENSOR REPLACEMENT .
Perform a line pressure test. refer to LINE PRESSURE CHECK .
Remove the control valve body cover. refer to CONTROL VALVE BODY COVER REMOVAL .
Inspect the inside of the control valve body cover for excessive sediment. There should not be excessive sediment.
- If excessive sediment is found, inspect and replace as necessary the Direct clutch, Low and reverse clutch, and 1 -2 reverse clutch. refer to FORWARD AND DIRECT CLUTCH ASSEMBLY ASSEMBLE , FRONT INTERNAL GEAR AND LOW AND REVERSE CLUTCH INSTALLATION , and 1-2 REVERSE CLUTCH ASSEMBLE .
Inspect the control valve body assembly for the following conditions. refer to CONTROL VALVE REAR BODY DISASSEMBLE and CONTROL VALVE BODY DISASSEMBLE - MIDDLE . The conditions should not be found.
- Stuck U1 shift valve
- Stuck M1 shift valve
- Stuck U2 shift valve
- Stuck neutral relay valve
- Stuck line pressure control solenoid valve assembly
  - If any of the above conditions are found, replace the valve body assembly. refer to CONTROL VALVE BODY REPLACEMENT .
Verify that the control valve body has been serviced within the past 3 months.
- If the control valve body has not been serviced, replace the control valve body assembly. refer to CONTROL VALVE BODY REPLACEMENT .
If all circuits and components test normal, replace the transmission.