COVER 1R6255 - Caterpillar

Position Sensor (Shift Lever)
Illustration 5 g00574813
The shift lever position sensor is an input of the ECM. The sensor connects to contacts J1-35, J1-40, J1-41, J1-42, J1-43, and J1-64. The sensor signals the ECM the operator's highest desired gear. The shift lever position sensor is connected mechanically to the shift lever in the shift console. The sensor has a connector with ten contacts.Five contacts on the sensor provide the ECM with the information for the position of the shift lever. For each position of the shift lever, the sensor grounds two of the five contacts through internal diodes. The sensor opens the other three contacts. The ECM interprets the status of the five contacts.Contact 1 of the sensor provides the ECM with a ground verify signal. The contact is normally connected to ground at all times. This tells the ECM that the sensor is connected. This prevents the ECM from thinking that the switch is missing when the switch is between gears.Contact 2 is connected to J2-63. Contact 10 provides a neutral signal to other devices in some applications. Contact 6 is connected to the +battery terminal. Contact 7 is blank. This contact serves as an index for the mating connector.The ECM records diagnostic codes with the sensor as a CID 0702 diagnostic code.Position Sensor (Transmission Gear)
Illustration 6 g00616555
Position sensor (transmission gear)
Table 1
Sensor Logic for the Position Sensor (Transmission Gear)    
Actual Gear    Ground Verify
J2-39    Gear 5
J2-38    Gear 4
J2-37    Gear 3
J2-36    Gear 2
J2-31    Gear 1
J2-30    
N     G     G     G                
Unused     G     G         G            
1R     G     G             G        
1F     G     G                 G    
2F     G         G     G            
3F     G         G         G        
4F     G         G             G    The position sensor for the transmission gear is an input to the ECM. The sensor connects to contacts J2-30, J2-31, J2-36, J2-37, J2-38 and J2-39. The sensor signals 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) signal 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