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Transmission Control Module Scan Tool Information (AF40-6)

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

The transmission control module (TCM) scan tool data parameters list contains all TCM related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists.

Transmission Control Module Scan Tool Data Parameters

Parameter System State Expected Value Description
Operating Conditions:  Ignition ON
Accelerator Pedal Position Accelerator pedal released 0% The scan tool displays the accelerator pedal position in percent pending on the position of the pedal.
Accelerator pedal pushed down 100%
Actual Engine Torque - 0-410 N.m (0-302 lb ft) The scan tool displays the actual engine torque.
Brake Band Pressure Control Solenoid Valve Current Selector switch in P 1 000 mA The scan tool displays the solenoid valve current.
Brake Pedal Switch Brake pedal released Inactive The scan tool displays Inactive or Active depending on the state of the brake pedal.
Brake pedal applied Active
Clutch Pressure Control Solenoid Valve 1 Current Selector switch in P 1 000 mA The scan tool displays the solenoid valve current.
Clutch Pressure Control Solenoid Valve 2 Current Selector switch in P 1 000 mA The scan tool displays the solenoid valve current.
Clutch Pressure Control Solenoid Valve 3 Current Selector switch in P 1 000 mA The scan tool displays the solenoid valve current.
Control Module Voltage Signal - 11-14 V The scan tool displays in volts the current battery voltage.
Current Gear Selector lever in position P, R, N, D P, R, N, D The scan tool displays the actual gear selected.
Descent Mode - Inactive The scan tool displays the descent mode active or inactive.
Downshift Protection - Inactive The scan tool displays the descent mode active or inactive. When the preventive downshift protection function became "active" at the first time after ignition ON, the parameter will be set and will kept up until ignition OFF.
Driver Shift Control Mode Selector switch in D Inactive The scan tool displays the driver shift control mode is active or inactive
Selector switch in +/- Active
Driver Shift Control Mode Switch Selector switch in D Inactive The scan tool displays the driver shift control mode is active or inactive as a CAN signal
Selector switch in +/- Active
Driver Shift Request Selector switch + Shift Up The scan tool displays the driver shift request
Selector switch - Shift Down
Engine Speed Engine running at idle speed 800-950 RPM The scan tool displays the actual engine speed.
Gear Ratio - 0.0:1 The scan tool displays the actual gear ratio.
Ignition Voltage Signal - 11-14 V The scan tool displays in volts the current ignition voltage.
Kickdown Mode Accelerator Pedal released Inactive The scan tool displays the kickdown request.
Accelerator Pedal actuated to full load Active
Kickdown Switch Accelerator Pedal released Inactive The scan tool displays the kickdown switch status.
Accelerator Pedal actuated to full load Active
Line Pressure Control Solenoid Valve Current - 1 000 mA The scan tool displays the Line Pressure Control Solenoid Valve Current.
Neutral Idle Mode Engine running at idle speed.
Accelerator pedal not actuated		 Inactive The scan tool displays the Neutral Idle Mode.
Engine running at idle speed.
Selector lever in position D		 Active
Power Mode Status - Active The scan tool displays if the unlock hardwire input to the controller is active or not.
Shift Solenoid Valve 1 Selector lever in position D On
Shift Solenoid Valve switches only briefly to On while shifting.		 The scan tool displays the Shift Solenoid Valve 1.
Selector lever in position P Off
Shift Solenoid Valve 2 Selector lever in position D On
Shift Solenoid Valve switches only briefly to On while shifting.		 The scan tool displays the Shift Solenoid Valve 2.
Selector lever in position R Off
Sport Mode Selector lever in position D Inactive The scan tool displays the sport mode status.
Sport Program key pressed Active
Sport Mode Switch Selector lever in position D Inactive The scan tool displays the sport mode switch status.
Sport Program key pressed Active
TCC Control Engine running at idle speed.
Selector lever in position P		 Disengaging The scan tool displays the Transmission Torque Converter Clutch (TCC) Status.
TCC Pressure Control Solenoid Valve Current Engine running at idle speed.
Selector lever in position P		 200-300 mA The scan tool displays the TCC Pressure Control Solenoid Valve Current.
TCC Slip Speed Engine running at idle speed.
Selector lever in position P		 0 RPM The scan tool displays the TCC Slip Speed.
Transmission Fluid Temperature Engine running at idle speed.
Selector lever in position P		 60-80°C The scan tool displays the transmission oil temperature.
Transmission (ISS) Engine running at idle speed.
Selector lever in position P		 700-950 RPM The scan tool displays the transmission input shaft speed.
Transmission (OSS) Engine running at idle speed.
Selector lever in position P		 0 km/h (0 MPH) The scan tool displays the transmission output shaft speed.
Transmission Range Switch Selector lever in position P, R, N, D P, R, N, D The scan tool displays the Transmission Range Selector Position.
Transmission Shift Mode - Economy Mode
Sport Mode
Warm-Up
Winter Mode
Cruise Control Mode		 There are a number of shift patterns that the TCM selects from. This scan tool display shows which pattern is currently used.
Vehicle Speed - 0 km/h (0 MPH) The scan tool displays km/h (MPH) depending on the current speed of the vehicle.
Warm-Up Mode Engine running at idle speed, operating temperature. Inactive The scan tool displays the status of the warm-up mode.
Transmission Control Module Scan Tool Output Controls

Output Control Description
Brake Band Pressure Control Solenoid Valve Transmission selector switch in P or N. Command the TCM brake band pressure Increase or Decrease.
Clutch Pressure Control Solenoid Valve 1
  • The TCM commands the Clutch Pressure Control Solenoid Valve in order to increase and decrease the clutches.
  • The solenoid remains increase until commanded decrease, and vice versa. When the output control is exited, the solenoid state is determined by the TCM.
  • When the ignition is ON, and the engine is OFF, there are no limits to this control.
Clutch Pressure Control Solenoid Valve 2
Clutch Pressure Control Solenoid Valve 3
Line Pressure Control Solenoid Valve
  • The scan tool is used to request pressure in increments of 207 kPa (30 PSI) from 0-1 862 kPa (0-270 PSI). The TCM will then command the solenoid to achieve the requested pressure.
  • When the ignition is ON, and the engine is OFF, the pressure request may be controlled within calibrated limits. There are no limits to the output control when the engine is OFF.
Solenoid Valve 1
  • The TCM commands Solenoid Valve 1 and Solenoid Valve 2 Active and Inactive.
  • When the ignition is ON, and the engine is OFF, there are no limits to this control. The solenoid remains Active until commanded Inactive, and vice versa. When the output control is exited, the solenoid state is determined by the TCM.
Solenoid Valve 2
TCC Solenoid Valve Transmission selector switch in P or N. Command the TCM TCC solenoid valve Increase or Decrease.
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