The shift control solenoid assembly (SLC1, SLC2, SLC3, SLB1) and the line pressure control solenoid (SLT) are installed on the front valve body. The solenoids linearly control hydraulic pressure in response to signals output from the transmission control module (TCM). SLC1, SLC2, SLC3, SLB1 controls hydraulic pressure to the clutches (C1, C2, C3) and brake (B1) for smooth shifting. According to each shift control solenoid assembly, the transmission shifts from 1st gear into 6th gear and vice versa. When the vehicle is stopped in range D, the transmission enters a neutral condition by releasing the clutch C1. By reducing drag loss of the torque converter, the load on the engine is lightened, fuel economy is enhanced, and idling vibration is reduced. As a fail-safe function, if any shift control solenoid assembly abnormality occurs, the TCM will disable the current to the solenoids.

P1701

P1701

Difference between engine speed and transmission input speed is below 150 RPM and not in 1st or reverse gear detected. Determined after 3 time lasting more than 0.8 s.

P1701

P1701

When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Description and Operation

Transmission Component and System Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Verify the transmission fluid level , colour and odor is correct.
2. Operate the vehicle to induce a shift from fifth to sixth gear while observing the following scan tool parameters. The scan tool parameters have to change the proper value referring to the current gear, compare the proper values with: Transmission System Description and Operation. Perform this action 2 times.

•	Clutch Pressure Control Solenoid Valve 1 Current

•	Clutch Pressure Control Solenoid Valve 2 Current

•	Clutch Pressure Control Solenoid Valve 3 Current

•	Brake Band Pressure Control Solenoid Valve Current

⇒	If the scan tool parameter does not change the proper value and no other DTC than P0729, P0731, P0732, P0733, P0734, P0735, P0736, P0780, P1701, P1731 is set, go to circuit/system testing.

⇒	If any other DTC is set, diagnose that DTC first.

Dynamic Test

1. Perform the Line Pressure Check.
2. Perform the Transmission Fluid Check.
3. If all circuits test normal, replace the K71 Transmission Control Module (TCM). Verify the DTC does not reset.

⇒	If the DTC resets replace the control valve body.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.