WIRING GP-ENGINE 3915673 - Caterpillar

Note: The transmission input speed sensor code is no longer supported by current software. The torque converter output speed sensor (CID 672) is currently supported for the same speed sensor.
Illustration 1 g02754597
Schematic of the Transmission Input Speed Sensor
This diagnostic code is recorded when the ECM receives an incorrect signal from the speed sensor when the engine is running. The signal is below the dropout signal level. The incorrect signal that is being read by the ECM could be erratic or intermittent. The ECM can determine that a problem exists by comparing the signal data between the TOS 1 sensor and the TOS 2 sensor. The ECM checks if one of the two signals is invalid or out of range.The following condition must be present before the diagnostic code will be active:
The signal from Transmission Input Speed Sensor to the ECM is incorrect.Test Step 1. CHECK THE SENSOR RESISTANCE.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the speed sensor.
At the connector for the speed sensor, measure the resistance between the two contacts of the connector of the speed sensor. Expected Result:The resistance measurement should be approximately 140 ohms at 25 °C (77 °F). The resistance of the sensor can range from 75 ohms at −40 °C (−40 °F) to 230 ohms at 230 °C (446 °F).Results:
OK - The speed sensor has not failed. Proceed to Test Step 2.
NOT OK - The speed sensor has failed.Repair: Replace the sensor. The sensor should need no adjustment when installed correctly.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT FOR AN OPEN IN THE MACHINE HARNESS.
Place a jumper between the two contacts of the machine harness connector for the speed sensor.
Disconnect connectors J1 and J2 from the machine harness of the ECM .
Measure the resistance from the sensor signal J1-8 wire (L910-PK(Pink)) to the return contact J1-9 wire (L911-YL(Yellow)) of the machine harness. Expected Result:There should be continuity (less than 5.0 ohms resistance). Results:
OK - The signal circuit in the machine harness is correct. Proceed to Test Step 3.
NOT OK - There is an open in the signal circuit of the machine harness.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE SIGNAL FOR A SHORT.
Remove the jumper between the two contacts of the speed sensor of the previous test step.
Reconnect the machine harness to the speed sensor.
At the J1 and J2 harness connectors, measure the resistance between J1-8 (wire L910-PK(Pink)) and all sources of positive voltage and ground. Expected Result:Each resistance should be greater than 5 ohms. Results:
OK - The machine harness is correct. Proceed to Test Step 4.
NOT OK - There is a short in the machine harness.Repair: The short is between the signal circuit (wire L910-PK(Pink)) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 4. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to