TM 9-2320-387-24-l
TRANSMISSION
SYSTEM
DTC 2l/22
Throttle Position (TP) Sensor Circuit High/
Throttle Position Sensor Circuit Low
Circuit Description:
The TP sensor contains a resistor strip with one end
connected to a 5-volt supply and the other to ground.
The signal is connected to a movable contact within
the TP sensor. As the accelerator pedal is applied and
the throttle shaft rotates, the voltage signal will
increase from approximately 0.5 to 4.5 volts.
DTC 21 Will Set When:
l Engine is operating.
l TPsensorsignalvolulgeisgn?aterthan4.9volts.
l Conditions are met for 1 second.
DTC 22 will Set When:
l Engine is operating.
l TP sensor signal voltage is less than 0.2 volt.
l Conditions are met for 1 second.
DTC 24
Output Speed Sensor Signal
Circuit Desctiption:
The output speed sensor is a magnetic induction-type
sensor. Gear teeth pressed -onto the output shaft
induce an alternating voltage into the sensor.
DTC 24 Will Set Whem
Not in P/N.
Circuit voltage is constant.
Engine speed is greater than 3,000 rpm.
Output speed is less than 200 rpm.
TP is between 10% and 100%.
All conditions are met for 3 seconds.
REFERENCE INFORMATION
DTC 28
Transmission Range (TR) Pressure
Switch Assembly (PSA) Fault
Circuit Description:
The Transmission Range (TR) Pressure Switch
Assembly consists of five normally open pressure
switches mounted on the valve body. The TCM
supplies battery voltage to each range signal. By
grounding one or more of these circuits through
various combinations of the pressure switches, the
TCM assembly detects what transmission range has
been selected by the vehicle operator. When the
transmission electrical connector is disconnected, the
ground potential for the three range signals to the TCM
willbemmovedandD2gearwiUbeindicated_
DTC 28 Wd Set W7aen.z
l Range signals A and C are both zero volt.
l Condition is met for 2 seconds.
DTC 37/38
Torque Converter Clutch (TCC) Brake
Switch Stuck ON/
TCC Brake Switch Stuck OFF
Circuit Description:
The normally closed brake switch supplies a B+
signal volt when the TCC brake switch is closed
(brake pedal not applied).
DTC 37 Will Set When-
Circuit 810B is open.
- Then vehicle speed is between 5 mph (8 kph)
and 20 mph (32 kph) for greater than 6
seconds.
- Then vehicle speed is greater than 20 mph (32
kph) for greater than 6 seconds.
- For a complete total of 7 times.
DTC 38 Will Set Whew
‘ICC brake switch feed CRT 810B has constant
voltage.
- Vehicle speed is greater than 20 mph (32 kph)
for greater than 6 seconds.
- Then vehicle speed is between 5 mph (8 kph)
and 20 mph (32 kph) for greater than 6
seconds.
- For a complete total of 7 tunes.
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