Scan Tool Output Control
| Additional Menu Selection(s)
| Description
|
1-2 Solenoid
| --
|
| • | The transmission control module (TCM) commands the 1-2 shift solenoid
valve ON and OFF. The scan tool 1-2 Sol. parameter should match the commanded state.
The scan tool Commanded Gear parameter should correspond with the shift solenoid combination.
Refer to
Shift Solenoid Valve State and Gear Ratio. |
| • | 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 be in order" appears on the scan
tool 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 scan
tool 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 scan tool
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 scan tool display. |
| - | The gear requested may not be greater than the current selected transmission
range (PRNDL). 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 scan tool 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 scan tool
2-3 Sol. parameter should match the commanded state. The scan tool Commanded Gear
parameter should correspond with the shift solenoid combination. Refer to
Shift Solenoid Valve State and Gear Ratio. |
| • | 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 be in order" appears on the scan
tool 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 scan
tool 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 scan tool
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 scan tool display. |
| - | The gear requested may not be greater than the current selected transmission
range (PRNDL). 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 scan tool 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. |
|
3-2 Downshift Solenoid
| --
|
| • | The TCM commands the 3-2 shift solenoid valve ON and OFF. The scan tool
3-2 Downshift Sol. 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 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: |
| - | The transmission range (PRNDL) must be in Park or Neutral. If the transmission
range is not in Park or Neutral, the message "Engine running and transmission
range is not Park/Neutral" appears on the scan tool 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. |
|
Clear TAPS (Transmission Adaptive Pressures)
| --
|
| • | The TCM clears (or resets) the TAP cells to the original base value. |
| • | There are no limits to using this output 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 (current) to the pressure control solenoid
in order 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 0.00-1.10 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 scan tool parameter "PC
Sol. Ref. Current" changes but the 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 scan
tool display. Both the scan tool 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 scan tool display. |
| - | Transmission range DTCs must not be active. If a transmission range DTC
is active, the message "Engine running with transmission DTC present"
appears on the scan tool display. |
|
Shift Transmission
| --
|
| • | When the ignition is ON, and the engine is OFF, there are no limits to
this control. The scan tool shift solenoid states change to match the Commanded Gear
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 scan tool 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 hi for 3-2 or 2-1 downshift"
appears on the scan tool 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 scan tool 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 scan tool display. |
| - | The TCM does not allow an upshift that is greater than the current selected
transmission range (PRNDL). 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 scan tool display. |
|
TCC Control Solenoid
| --
|
| • | The TCM commands the duty cycle of the torque converter clutch (TCC) pulse
width modulation (PWM) solenoid. The duty cycle is represented by a percentage of
ON (energised) time. Approximately 90-100 percent duty cycle represents an ON (energised)
commanded state. Zero percent represents an OFF (non-energised) commanded state. The
scan tool 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. If the solenoid is requested OFF,
the message "TCC OFF command disabled in Hot Mode" appears on the scan
tool display. |
| - | The TCC control solenoid may not be commanded OFF for more than a calibrated
amount of time. If the solenoid is commanded OFF for a certain amount of time, the
message "TCC OFF time has been exceeded" appears on the scan tool display. |
|
TCC Enable
| --
|
| • | The TCM commands the TCC enable solenoid valve ON and OFF. The scan tool
TCC Enable 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 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: |
| - | If the transmission range is Park or Neutral, the TCC enable solenoid
may not be commanded OFF for more than a calibrated amount of time. If the solenoid
is commanded OFF for a certain amount of time, the message "TCC OFF time has
been exceeded" appears on the scan tool display. |
| - | If the transmission range is Park or Neutral and the TCC control solenoid
duty cycle is less than maximum capacity, the TCC enable solenoid may not be commanded
ON. If the solenoid is requested ON during these conditions, the message "TCC
Control Solenoid is not set to maximum Pressure" appears on the scan tool display. |
| - | If the TCC control solenoid duty cycle is less than maximum capacity,
the TCC enable solenoid may not be commanded ON. If the solenoid is commanded ON during
these conditions the message "TCC Control Solenoid is not set to maximum Pressure"
appears on the scan tool display. |
| - | If the transmission is in hot mode, the TCC enable solenoid may not be
commanded OFF. If the solenoid is requested OFF the message "TCC OFF command
disabled in Hot Mode" appears on the scan tool display. |
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