GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Holden 🢒 2005 🢒 Calais 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 5L40-E/5L50-E 🢒 Scan Tool Output Controls

In this test mode, the Tech 2 performs software overrides of the TCM to assist in problem isolation during diagnostics.

Scan Tool Output Control

Description

1-2 Solenoid

The TCM commands the 1-2 shift solenoid valve ON and OFF. The Tech 2 1-2 Solenoid parameter should match the commanded state. The Tech 2 Command Gear parameter should correspond with the shift solenoid combination. Refer to Electronic Component Description.

When the ignition is ON and the engine is OFF, there are no limits to this control. The solenoid remains ON until commanded OFF and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

when the engine is running, the following control limits apply:

    • Only sequential gear changes are allowed. For example, 1st to 3rd is not allowed. If a non-sequential gear change is attempted, the message 'Non-sequential gear changes not allowed. Gear changes must appear on the Tech 2 display.
    • The vehicle speed must be below a calibrated value. If the vehicle speed is too high, the message 'Vehicle speed too high' appears on the Tech 2 display.
    • The engine speed must be below a calibrated value. If the engine speed is too high, the message 'Engine speed too high' appears on the Tech 2 display.
    • Downshifts are allowed only when the vehicle speed is below a calibrated value. If the vehicle speed is too high, the message 'Eng. is on and veh. speed too hi for 3-2 or 2-1 downshift' appears on the Tech 2 display.
    • The gear requested may not be greater than the current selected transmission range. For example, 3rd gear is not allowed if the transmission range is D2. If the gear requested is greater than the current selected transmission range, the message 'Eng. running and gear request is greater than the current TR' appears on the Tech 2 display.

The solenoid remains ON until commanded OFF and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

2-3 Solenoid

The TCM commands the 2-3 shift solenoid valve ON and OFF. The Tech 2 2-3 Sol. parameter should match the commanded state. The Tech 2 Commanded Gear parameter should correspond with the shift solenoid combination. Refer to Electronic Component Description.

When the ignition is ON the engine is OFF, there are no limits to this control. The solenoid will remain ON until commanded OFF and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

When the engine is running, the following control limits apply:

    • Only sequential gear changes are allowed. For example, 1st to 3rd is not allowed. If a non-sequential gear change is attempted, the message 'Non-sequential gear changes not allowed. Gear changes must appear on the Tech 2 display.
    • The vehicle speed must be below a calibrated value. If the vehicle speed is too high, the message 'Vehicle speed too high' appears on the Tech 2 display.
    • The engine speed must be below a calibrated value. If the engine speed is too high, the message 'Engine speed too high' appears on the Tech 2 display.
    • Downshifts are allowed only when the vehicle speed is below a calibrated value. If the vehicle speed is too high, the message 'Eng. is on and veh. speed too hi for 3-2 or 2-1 downshift' appears on the Tech 2 display.
    • The gear requested may not be greater than the current selected transmission range. For example, 3rd gear is not allowed if the transmission range is D2. If the gear requested is greater than the current selected transmission range, the message 'Eng. running and gear request is greater than the current TR' appears on the Tech 2 display.

The solenoid remains ON until commanded OFF and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

4-5 Solenoid

The TCM commands the 4-5 shift solenoid valve ON and OFF. The Tech 2 4-5 Sol. parameter should match the commanded state. The Tech 2 commanded Gear parameter should correspond with the shift solenoid combination. Refer to Electronic Component Description.

When the ignition is ON and the engine is OFF, there are no limits to this control. The solenoid will remain ON until commanded OFF and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

When the engine is running, the following control limits apply:

    • Only sequential gear changes are allowed. For example, 1st to 3rd is not allowed. If a non-sequential gear change is attempted, the message 'Non-sequential gear changes not allowed. Gear changes must appear on the Tech 2 display.
    • The vehicle speed must be below a calibrated value. If the vehicle speed is too high, the message 'Vehicle speed too high' appears on the Tech 2 display.
    • The engine speed must be below a calibrated value. If the engine speed is too high, the message 'Engine speed too high' appears on the Tech 2 display.
    • Downshifts are allowed only when the vehicle speed is below a calibrated value. If the vehicle speed is too high, the message 'Eng. is on and veh. speed too hi for 3-2 or 2-1 downshift' appears on the Tech 2 display.
    • The gear requested may not be greater than the current selected transmission range. For example, 3rd gear is not allowed if the transmission range is D2. If the gear requested is greater than the current selected transmission range, the message 'Eng. running and gear request is greater than the current TR' appears on the Tech 2 display.

The solenoid remains ON until commanded OFF and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

Reset Transmission Adapts

The TCM clears or resets all TAP cells to zero.

There are no limits to using this control. It may be performed with the engine running or when the ignition is ON and the engine is OFF.

PC Solenoid

The TCM commands the amperage to the pressure control solenoid to control transmission line pressure. As the amperage increases, the line pressure decreases. As the amperage decreases, the line pressure increases. The amperage range is 0.1-1.1 and may be commanded in one-tenth amp increments.

When the ignition is ON and the engine is OFF, the reference commanded amperage may be controlled within calibrated limits. The Tech 2 parameter 'PC Sol. Actual current' does not change. The reference current remains until commanded otherwise.

When the engine is running, the following control limits apply:

    • When the transmission range is Park or Neutral, the reference commanded amperage may be controlled within calibrated limits. The engine speed must be less than 1 500 RPM. If the engine speed is greater than 1 500 RPM, the message 'TR in park/neutral and engine speed over 1 500 RPM' appears on the Tech 2 display. Both the Tech 2 parameters 'PC Sol. Ref. Current' and PC Sol. Actual Current' change. Both current readings remain until commanded otherwise.
    • When the transmission range is not in Park or Neutral, the reference amperage can only be controlled less than the current determined by the TCM. The TCM does not allow a value to be selected that may cause damage to the transmission. If the requested amperage is more than allowed by the TCM, the message 'Requested current for the PC Solenoid is too high' appears on the Tech 2 display.

Transmission IMS DTCs must not be active. If a transmission IMS DTC is active, the message 'Engine running with transmission DTC present' appears on the Tech 2 display.

Shift Transmission

The TCM commands upshifts and downshifts. The Tech 2 Commanded Gear parameter should correspond with the shift solenoid combination. Refer to Electronic Component Description.

When the ignition is ON and the engine is OFF, there are no limits to this control. The Tech 2 shifts solenoid states change to match the Commanded Gar selected.

When the engine is running, the following control limits apply:

    • The TCM does not allow a shift if it causes the engine rpm to exceed a calibrated limit. If a gear is requested and the engine speed is too high, the message 'Engine speed too high' appears on the Tech 2 display.
    • The TCM does not allow a 3-2 or 2-1 downshift if the vehicle speed exceeds a calibrated limit. If either downshift is requested and the vehicle speed is too high, the message 'Eng. is on and veh. speed too high for 3-2 or 2-1 downshift' appears on the Tech 2 display.
    • The TCM does not allow a 4-3 downshift if the vehicle speed exceeds a calibrated limit. If a 4-3 downshift is requested and the vehicle speed is too high, the message 'Vehicle speed too high' appears on the Tech 2 display.
    • The TCM does not allow an upshift if the vehicle speed exceeds a calibrated limit. If an upshift is requested and the vehicle speed is too high, the message 'Vehicle speed too high' appears on the Tech 2 display.

The TCM does not allow an upshift that is greater than the current selected transmission range. For example 3rd gear is not allowed if the transmission range is D2. If an upshift is requested that is greater than the current selected transmission range, the message 'Eng. running and gear request is greater than the current TR' appears on the Tech 2 display.

TCC Control Solenoid

The TCM commands the duty cycle of the TCC PWM solenoid. The duty cycle is represented by a percentage of ON, energized, and time. Approximately 90-100 percent duty cycle represents an ON, energized commanded state. Zero percent represents an OFF, non-energized commanded state. The Tech 2 TCC Duty Cycle parameter should match the commanded state.

When the ignition is ON and the engine is OFF, there are no limits to this control. The solenoid remains ON, 90-100 percent duty cycle until commanded OFF, zero percent duty cycle and vice versa. When the output control is exited, the solenoid duty cycle is determined by the TCM.

When the engine is running, the following control limits apply:

If the transmission range is Park and the transmission is in hot mode, the TCC control solenoid may not be commanded OFF, for a certain amount of time, the message 'TCC OFF time has been exceeded' appears on the Tech 2 display.

High side Driver 1

The TCM commands the driver for the solenoid voltage supply ON and OFF.

When the ignition is ON and the engine is OFF, there are no limits to this control.

High side driver 1 may not be commanded ON and OFF with Tech 2 if the engine is running.

High Side Driver 2

The TCM commands the driver for the solenoid voltage supply ON and OFF.

When the ignition is ON and the engine is OFF, there are no limits to this control.

High side driver 2 may not be commanded ON and OFF with Tech 2 if the engine is running.