RING 3T5555 - Caterpillar

Transmission Gear Position Sensor
Illustration 2 g00616555
Transmission Gear Position Sensor
Table 1
Transmission Gear Sensor Logic    
D250EII
D300EII
Gear
Position    D350EII
Gear
Position    D400EII
Gear
Position    Sensor
Position (1)    Low Signal (2)At Sensor Connector Contact No.    Circuit Name    
N     Not Used     N     A     3
2     Gear 4
Gear 5    
R1     N     Not Used     B     6
2     Gear 3
Gear 5    
R2     R     R     C     7
2     Gear 2
Gear 5    
Not Used     1st     1st     D     8
2     Gear 1 Gear 5    
1st     2nd     2nd     E     6
3     Gear 3
Gear 4    
2nd     3rd     3rd     F     7
3     Gear 2
Gear 4    
3rd     4th     4th     G     8
3
    Gear 1
Gear 4    
4th     Not Used     5th     H     7
6     Gear 2
Gear 3    
5th     Not Used     6th     I     8
6     Gear 1
Gear 3    
Not Used     Not Used     7th     J     8
7     Gear 1
Gear 2    
( 1 ) See the Transmission Gear Sensor Illustration
( 2 ) For a specific sensor position, a low signal (less than 0.5 DCV) exists between each of the two listed contacts and ground. All other gear circuits are high (5.0 DCV). Sensor connector contact 4 must be supplied with +V (24 DCV), battery voltage.The transmission gear position sensor is an input to the ECM. The sensor connects to contacts J1-29, 30, 31, 32, 33 and 35. The sensor tells the ECM the transmission gear that is active. The sensor is connected mechanically to the rotary actuator of the transmission. The sensor has a connector with nine contacts.The sensor contacts (2, 3, 6, 7, and 8) tell the ECM the current gear information. In each position of the rotary actuator, the sensor provides a low signal (0.5 DCV) at two of the five contacts. The sensor also provides a high signal (5.0 DCV) at the other three contacts at the same time. The ECM interprets the status of the five contacts.The number one contact of the sensor provides the ECM with a ground. The number one contact is connected to ground at all times. This tells the ECM that the sensor is connected properly.Contact 10 of the sensor is connected to frame ground at all times. Contact 4 of the sensor is connected to the sensor power supply at all times. Contact 9 is not connected. The position for connector contact 5 is blank. This blank space is an index for the mating connector.The ECM records diagnostic codes that occur with the sensor as a CID 0700. A record is made of the diagnostic code if the combination of switch signals is invalid.Shift Lever Position Sensor
Sensors provide information (input) to the ECM about conditions that change. The sensor signal changes proportionally in order to reflect the condition that changes. The ECM recognizes a PWM signal from a sensor. The