Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Operate the vehicle in D.
- Using the scan tool record the gear ratio while accelerating in 4th gear. The gear ratio should be within 1.04:1-1.56:1.
- If the 4th gear ratio is 1.00:1, inspect and repair the control valve body assembly for the following conditions. Refer to Control Valve Body Assembly Disassemble .
- Stuck 2-3, 3-4 shift solenoid valve assembly
- Stuck M2 shift valve
If the conditions test normal, replace the control valve body assembly, Refer to Control Valve Body Replacement procedure.
- If the 4th gear ratio is not within the specified range and is not 1.00:1, continue to step 3.
- 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 procedure.
- 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 procedure.
- Ignition ON, engine OFF, command shift solenoid 1 ON and OFF with a scan tool. The solenoid should click when commanded ON.
- If the solenoid does not click, replace the 1st shift solenoid valve assembly. Refer to Control Valve Body Assembly Disassemble .
- Command shift solenoid 3 ON and OFF with a scan tool. The solenoid should click when commanded ON.
- If the solenoid does not click, replace the 1-2, 2-3, reverse shift solenoid valve assembly. Refer to Control Valve Body Assembly Disassemble .
- Perform a line pressure test. Refer to Line Pressure Check procedure.
- Remove the control valve body cover. Refer to Control Valve Body Cover Removal procedure.
- 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 4-5 clutch and forward clutch. Refer to 4-5 Clutch Drum Assembly Assemble and Forward and Direct Clutch Assembly Assemble procedures.
- 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 shift pressure relay 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 procedure.
- 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.