ADAPTER-TIP 2322110 - Caterpillar

The supply voltage is routed to terminal 1 of each sensor connector. The sensor return is routed to terminal 2 of each sensor connector. The sensor signal is routed to terminal 3 of each sensor connector. The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.Diagnostics on the Cat® Electronic Technician (ET)WIGGLE TEST - The Wiggle Test allows you to monitor the status of the signals from the sensors.For additional information regarding the Wiggle Test, refer to the documentation that accompanies the Cat ET software.
Illustration 1 g06066994
Schematic for the active sensors
Table 2
Troubleshooting Test Steps Values Results
1. Check for Diagnostic Codes
A. Establish communication between Cat ET and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Turn the keyswitch to the ON position.
C. Look for "-3", or "-4" active or logged codes.
Codes
Result: A -3 diagnostic code is active.
Proceed to Test Step 2.
Result: A -4 diagnostic code is active.
Proceed to Test Step 3.
2. Create a Short at the Sensor Connector
A. Use a test lamp to create a short between terminal 3 (signal) and terminal 2 (sensor return) at the sensor connector.
B. Turn the keyswitch to ON.
C. Monitor the diagnostic codes on Cat ET. Check for an active -4 diagnostic code for the suspect sensor.
D. Turn the keyswitch to OFF.
Short circuit Result: A -4 diagnostic code does not become active for the suspect sensor.
Proceed to Test Step 4.
Result: A -4 diagnostic code became active after creating the short at the sensor connector.
Repair: The wiring is OK. Replace the sensor.
If the problem is not resolved, proceed to Test Step 3.
3. Create an Open at the Suspect Sensor Connector
A. Turn the keyswitch to OFF.
B. Disconnect the sensor connector of the suspect sensor with the active -4 diagnostic code.
C. Turn the keyswitch to ON.
D. Monitor the diagnostic codes on Cat ET. Check for an active -3 diagnostic code for the suspect sensor.
E. Turn the keyswitch to OFF.
Open circuit
Result: A -3 diagnostic code was not active after disconnecting the sensor.
Proceed to Test Step 4.
Result: A -3 diagnostic code became active after disconnecting the sensor.
Repair: The wiring is OK. Replace the sensor.
If the problem is not resolved, proceed to Test Step 4.
4. Check the 5 VDC Supply Voltage at the Sensor Connector
A. Turn the keyswitch to ON.
B. Measure the voltage between pin 1 and pin 2 at the suspect sensor.
Voltage supply
Result: The supply voltage is approximately 5.0 0.2 VDC
Repair: Connect the sensor and then proceed to Test Step 5
Result: The supply voltage is not approximately 5.0 0.2 VDC.
Repair: There is a short in the harness to the battery. Repair the wiring or replace the harness
If the problem is not resolved, proceed to Test Step 5.
5. Perform the Wiggle Test
Note: Carefully following this procedure is the best way to identify the root cause of an intermittent problem.
A. Turn the keyswitch to ON.
B. Use CAT ET to run the "Wiggle Test".
C. Slowly wiggle the wiring and the connectors between the P2