TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
Page 448 of 1205
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 theTCM 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. 2-396