NORMAL Inhibits Which Result in a Blinking PRNDL
| • | High Engine Speed NEUTRAL to Range Shifts |
| | When a NEUTRAL
to DRIVE or NEUTRAL to REVERSE shift is made, when engine RPM is high, the shift will
be inhibited to NEUTRAL. The TCM has torque management capability and will attempt
to slow the engine to a point where it will make the requested shift. |
| • | High Throttle or Torque Direction Change Shifts |
| | REVERSE to
DRIVE, DRIVE to REVERSE, NEUTRAL to DRIVE, and NEUTRAL to REVERSE shifts, where throttle
position is greater than 25 percent, will be inhibited to NEUTRAL. The TCM
has torque management capability and will attempt to slow the engine to a point where
it will make the requested shift. |
| • | Four-Wheel Drive Transfer Case in NEUTRAL |
| | If the four-wheel
drive transfer case is shifted into NEUTRAL while the transmission is in DRIVE or
REVERSE, the transmission will continue to the commanded range until output speed
is low, at which point NEUTRAL is commanded. |
| | If the driver attempts to shift the transmission from NEUTRAL to DRIVE or NEUTRAL
to REVERSE, with the transfer case in NEUTRAL, the PRNDL display will blink immediately. |
| • | High Output Speed Direction Change Shifts |
| | REVERSE to DRIVE,
DRIVE to REVERSE, and NEUTRAL to REVERSE shifts, initiated above 300 RPM output
speed, will be inhibited to NEUTRAL. |
| • | Low Automatic Transmission Fluid (ATF) Level |
| | Low ATF
level is caused by insufficient transmission fluid and lack of initial pump prime,
caused by refilling the transmission. |
| • | Extremely Low ATF temperature |
| | A shift out of NEUTRAL when
the ATF temperature is below -45°C (-49°F) may be inhibited. |
MALFUNCTIONS Which May Cause a Blinking PRNDL
Failure to detect turbine speed pull-down during a shift may occur under the
following conditions:
| • | A clutch is failed and the transmission cannot attain the requested range. |
| • | The park/neutral position (PNP) switch or selector linkage is out
of adjustment |
| • | Turbine or output speed sensor failure |
| • | Lack of pressure at startup |
Conditions Which May Cause a BLANK PRNDL
The PRNDL display may be blank under the following conditions:
| • | Failure of the PNP switch circuits A, B, C, or P |
| • | The PNP switch is out of adjustment. |
| • | The PNP switch is damaged. |
The transmission will command the most appropriate range, based on reverse pressure
switch and the remaining PNP switch inputs.
