Scan Tool Output Control
| Additional Menu Selection(s)
| Description
|
Line PC Solenoid
| Line PC Sol. Functional
|
| • | The TCM commands the amperage to the line 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 0.20-1.10 and may be commanded
in one-tenth amp increments. |
| • | 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 scan tool parameters "Line PC Sol. Ref. Current" and "Line
PC Sol. Actual Current" change with the scan tool commands and
remain until commanded otherwise. |
| - | When the transmission range is not Park or Neutral, amperage may
be controlled within calibrated limits. If the current requested is too
high or too low, the message "Requested current for the PC Solenoid is
too high" appears on the scan tool display. |
| - | 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 override current out of range"
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. |
|
Sheave Ratio Control
| --
|
| • | The TCM commands the position of the ratio control motor pintle
in order to control the speed of the transmission. As the pintle is extended,
the speed ratio of the transmission is increased. The speed ratio range
is 0.4-1.8 and can be commanded in 0.2 increments. |
| • | When the engine is running, the following control limits apply: |
| - | The sheave ratio control may not be commanded to increase the
speed ratio, if the engine speed is below a calibrated value. If the
solenoid is commanded to increase when the engine speed is too low, the
message "Engine Speed Too Low" appears on the scan tool display. |
| - | The sheave ratio control may not be commanded to increase the
speed ratio, if the vehicle speed is below a calibrated value. If the
solenoid is commanded to increase when the vehicle speed is too low,
the message "Vehicle Speed Too Low" appears on the scan tool
display. |
| - | The sheave ratio control may only command changes in speed ratio
when the vehicle is moving within a calibrated vehicle speed range in
Drive range. When the transmission range is not Drive and sheave ratio
control is attempted, the message "Transmission range must be in drive"
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. |
|
TCC Solenoid
| TCC Enable Sol. Functional
|
| • | The TCM commands the state of the TCC enable solenoid. The state
represents whether the solenoid is directing fluid to the TCC/NI enable
signal fluid circuit or not. "Enabled" indicates that the TCC Enable
solenoid is ON and is directing fluid to the fluid circuit and thereby
allowing the TCC PC solenoid to apply the torque converter clutch. "Disabled"
indicates that the TCC Enable solenoid is exhausting fluid from the TCC/NI
enable signal fluid circuit. The scan tool TCC enable solenoid parameter
should match the commanded state. |
| • | When the engine is running, the following control limits apply: |
| - | The TCC enable solenoid may not be commanded enabled if the vehicle
speed is below a calibrated value. If the solenoid is commanded ON when
the vehicle speed is too low, the message "The Vehicle Speed is
Too Low" 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. |
| - | The TCC Enable Sol. Functional control may only command the TCC
system ON and OFF when the vehicle is moving within a calibrated vehicle
speed range in Drive range. When the transmission range is not Drive and
TCC system is commanded ON or OFF, the message "The Vehicle Speed
is Too Low" appears on the scan tool display. |
|
TCC Solenoid
| TCC PC Sol. Functional
|
| • | The TCM commands the duty cycle of the TCC PC solenoid.
The duty cycle is represented by a percentage of ON, energized, time.
Approximately 90-100 percent duty cycle represents an ON, energized,
commanded state. One percent represents an OFF, non-energized,
commanded state. The scan tool TCC Duty Cycle parameter should match
the commanded state. |
| • | When the engine is running, the following control limits apply: |
| - | The TCC PC 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. |
| - | The TCC PC solenoid may not be commanded ON if the vehicle speed
is below a calibrated value. If the solenoid is commanded ON when the
vehicle speed is too low, the message "The Vehicle Speed is Too
Low" appears on the scan tool display. |
| - | The TCC PC Sol. Functional control may only command the
TCC system ON and OFF when the vehicle is moving within a calibrated vehicle
speed range in Drive range. When the transmission range is not Drive and
TCC system is commanded ON or OFF, the message "The Vehicle Speed
is Too Low" 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. |
|
Trans. Adaptives Reset
| --
|
| • | 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. |
|
