CABLE 1350381 - Caterpillar

Table 1
Troubleshooting Test Steps Values Results
1. CHECK THE DATA LINKS.
A. Connect the Caterpillar Electronic Technician (Cat ET) service tool to the machine.
B. Use a valid key to turn the keyswitch to the ON position.
C. Use the Cat ET service tool to determine the status of the Cat data-link.
The data links are communicating with all the ECMs that are installed on the machine.
Note: Some machines are equipped with only the MSS3s ECM. Yes - The data links are communicating with all the ECMs that are installed on the machine.
Proceed to Test Step 2.
No - The data links are not communicating with all the ECMs that are installed on the machine. The Cat data-link has failed.
Repair:Repair the data link circuits in the harness.
STOP.
2. CHECK THE SYSTEM VOLTAGE AT THE MSS3s ECM.
A. Measure the voltage between pin 1 and pin 3 of the MSS3s ECM.
The voltage is approximately system voltage. Yes - The voltage is approximately system voltage.
Proceed to Test Step 3.
No - The voltage is not approximately system voltage.
Repair: Check the battery and the associated wiring in the machine harness.
STOP.
3. CHECK THE VOLTAGE FROM THE KEY SWITCH TO THE DRIVER (INPUT No. 1) OF THE ECM.
A. Turn the keyswitch to the ON position.
B. Measure the voltage between pin 24 and pin 29 if the wires are present. Record the reading.
Voltage should be present for all of the measurements. The voltage should be within 10% of the machine battery voltage. Yes - The voltage is present and the voltage level is correct. The ECM is receiving voltage.
Proceed to Test Step 4.
No - The voltage was not correct, or no voltage was present.
Repair: Check the harness for signs of damage. Repair or replace the harness.
STOP.
4. CHECK THE VOLTAGE FROM THE KEY SWITCH TO THE DRIVER (INPUT No. 2) OF THE ECM.
A. Turn and hold the keyswitch in the START position.
B. Measure the voltage between pin 18 and pin 31 if the wires are present. Record the reading.
Voltage should be present for all measurements. The voltage should be within 10% of the battery voltage. Yes - The voltage is present and the voltage level is correct. The ECM is receiving voltage.
Proceed to Test Step 5.
No - The voltage was not correct, or no voltage was present.
Repair: Check the harness for signs of damage. Repair or replace the harness.
STOP.
5. CHECK THE DRIVER (OUTPUT No. 1) VOLTAGE.
Note: The output drivers of the MSS3s ECM are protected from excessive electrical current. Excessive electrical current is usually the result of a wire or a component that is shorted to ground. If the MSS3s ECM detects an excessive amount of electrical current, the MSS3s ECM will disable the output driver.
A. Place the keyswitch in the ON position. With 7X-1710 Multimeter Probes check for voltage between pin 58 and pin 11 with the wires present. Do not disconnect the connector from the MSS3s ECM.
Voltage should be present. The voltage should be within 10% of the machine battery voltage. Yes - The voltage is present and the voltage level