Transmission Description
Note. Use this section of the workshop manual for the 6R60 6-speed transmission only. Do not substitute with other procedures regardless of similarities.
This transmission has an internal thermal bypass valve contained within the case. The thermal bypass valve will not allow the use of any type of transmission fluid exchange machine to be used on this transmission.
This transmission uses planetary gears with hydraulic electronic controls. The transmission control module (TCM) and the main control valve body units form a composite element that is installed as a single unit inside the automatic transmission.
This transmission has
- six forward speeds.
- torque converter with an integral converter clutch.
- electronic shift and pressure controls.
- single planetary gear set.
- double planetary gear set.
- two fixed multi-disc clutches.
- three multi-plate clutches.
All hydraulic functions are directed by electronic solenoids to control
- engagement feel.
- shift feel.
- shift scheduling.
- modulated torque converter clutch (TCC) applications.
This transmission has a mechatronic unit also referred to as a TCM which contains
- turbine shaft speed (TSS) sensor.
- output shaft speed (OSS) sensor.
- an internal P, R, N, D selector shaft position sensor.
- transmission fluid temperature (TFT) sensor.
Engine power reaches the transmission by a torque converter with an integral converter clutch. The 6 forward gears and one reverse gear are obtained from single planetary sets.
This automatic transmission is a 6-speed electronically controlled transmission comprising the basic elements of a TCM, main control valve body unit, torque converter, one solenoid valve and 6 pressure regulators. Gear selection is achieved by the control of automatic transmission fluid flow to operate various internal clutches. The TCM operates the electrical components and provides for the control of gear selection shift pressure, which increases refinement and torque converter slip.
In the event of a system fault, the TCM also provides for failure mode effect management (FMEM) to maintain maximum functional operation of the transmission with a minimum reduction in driver, passenger or vehicle safety. In the event of a total loss of control or electrical power, the basic transmission functions P, R, N and D are retained. Also 3rd or 5th gear is retained by the hydraulic system. The gear retained is dependent upon the gear selected at the time of the failure.
Scheme 2
The identification tag is located on the left side of the case just rearward of the manual control lever.
Scheme 3
| Item | Part Number | Description |
|---|---|---|
| 1 | Part number | |
| 2 | Build date | |
| 3 | Serial number |
Diagnostic Parameters Identification (PID) Chart
Special Tools Illustration Tool Name Tool Number Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool
| PID Name | PID Description | Units |
|---|---|---|
| ECT TCM | Engine coolant temperature (ECT) transmission control module (TCM) | Degrees |
| VSS | Vehicle speed | Mph |
| TP | Throttle position | Percent/Volts |
| VPWR TCM | Module supply voltage | Volts |
| APP1 | Accelerator pedal position sensor 1 | Percent |
| SSA_AMP | Commanded current for shift solenoid A | Amperes |
| SSB_AMP | Commanded current for shift solenoid B | Amperes |
| SSC_AMP | Commanded current for shift solenoid C | Amperes |
| SSD_AMP | Commanded current for shift solenoid D | Amperes |
| PCA AMP | Commanded current for pressure control A | Amperes |
| TCC AMP | Commanded current for torque converter clutch pressure control | Amperes |
| SSE | Shift solenoid E duty cycle | Percent |
| RPM | Engine speed | Rpm |
| GEAR | Gear commanded (1, 2, 3, 4, 5 and 6) | 1, 2, 3, 4, 5 and 6 |
| TC_SLIPACT | Absolute value of slip across torque converter | Rpm |
| GR_RAT_CMD | Current transmission gear ratio commanded | Ratio |
| GR_RAT_MES | Current transmission gear ratio measured (input speed/output speed) | Ratio |
| TFT | Transmission fluid temperature | Degrees |
| OSS_SRC | Output shaft speed (OSS) | Rpm |
| TSS | Turbine shaft speed (TSS) | Rpm |
| TR | Transmission range | Park, Reverse, Neutral, Drive, 3, 2 1 |
| BOO | Brake On/Off | On or Off |
| PCA AMP | Commanded pressure for pressure control solenoid A (VFS5) | Amperage |
| OSS | Output shaft speed (OSS) sensor | Rpm |
| TCC | Torque converter clutch modulated | Locked/Unlocked |
| BPA | Brake pressure applied switch | On/Off |
| AST | Time since start | Time |
| CLRDIST | Distance since diagnostic trouble code cleared | Miles |
| DRIVE | Transmission range (drive verification position) | Yes/No |
| DTC TCM | Continuous codes | DTC numbers |
| ENG LOAD | Engine load | Percent |
| GEAR_OSC# | Gear commanded by output state control | Mode number |
| MIL_DIS | The distance traveled since the MIL was activated | Mileage |
| NEUTRAL | Gear lever position - neutral | Yes/No |
| REVERSE | Gear lever position - reverse | Yes/No |
| RPM TCM | Engine revolutions per minute | Rpm |
| SHFT_TYPE | Shifter position | Mode number |
| TCC_OSC# | Output state control of torque converter | Locked/Unlocked |
| TORQUE | Net engine torque | Torque Nm |
| TSS_SRC | Unfiltered turbine shaft speed | Rpm |
| WARMUPS | Number of warm-ups since DTCs cleared | Number |
| TCS | Overdrive cancel switch/hold switch (transmission control [TC] switch) | Depressed/Not depressed |
OSC PARAMETERS AND ADDITIONAL PIDS