PLATE GP-WEAR 1363983 - Caterpillar

Illustration 1 g03726847
Typical schematic of the circuit for the indicator lamps
Not all connectors are shown. Refer to the Electrical Schematic for the application.
Illustration 2 g03726859
Pin locations on the P1 connector for the indicator lamps
(48) DEF level lamp
(50) Wait to start lamp
(51) Shutdown lamp
(69) Low oil pressure lamp
(74) DEF quality lamp
(92) Warning lamp
(94) MIL lamp
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Check the fuses.
C. Thoroughly inspect the P1 connector and the lamp connections. Refer to Troubleshooting, "Electrical Connector - Inspect" for details.
D. Perform a 30 N (6.7 lb) pull test on each of the wires in the P1 connector that are associated with the indicator lamps.
E. Check the harness for abrasions and for pinch points from the battery to the ECM.
Damaged wire or connector
Result: A damaged wire or damaged connector was not found. The fuses are OK.
Proceed to Test Step 2.
Result: A damaged wire or damaged connector was found. a fuse is blown.
Repair: Repair the damaged wire or the damaged connector. Replace any blown fuses.
Use the electronic service tool to clear all logged diagnostic codes. Verify that the repair eliminates the fault.
2. Check for Recently Logged Diagnostic Codes
A. Turn the keyswitch to the ON position.
Note: Lamp Test - When the keyswitch is turned to the ON position, the ECM will activate the lamps for 2 seconds.
B. Check that all of the indicator lamps come on during the 2 second lamp test.
Wait at least 10 seconds for activation of the diagnostic codes.
C. Access the "Active Diagnostic Code" screen on the electronic service tool and check for active diagnostic codes.
Diagnostic Trouble Codes
Lamp function
Result: At least one of the lamps did not come on during the lamp test.
Proceed to Test Step 3.
Result: One of the diagnostic codes listed in Table 1 is active or recently logged.
Proceed to Test Step 6.
3. Check the Lamp
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect lamp. Inspect the lamp in order to determine if the lamp has failed.
C. Use a multimeter in order to measure the resistance across the two terminals of the lamp. If the resistance is more than 2000 Ohms, the bulb has failed.
Lamp
Result: The lamp is OK.
Proceed to Test Step 4.
Result: The lamp has failed.
Repair: Install a replacement lamp.
Turn the keyswitch to the ON position. Ensure that the lamp comes on during the 2 second lamp test.
4. Measure the Input to the Lamp at the Lamp Socket
A. Turn the keyswitch to the ON position.
B. Measure the voltage between the lamp socket and a suitable ground.
C. Turn the keyswitch to the OFF position.
10 V to 14 V
Result: The measured voltage is within the expected range.
Proceed to Test Step 5.
Result: The measured voltage is not within the expected range.
The fault is in the wiring between the suspect lamp input and the main relay.
Repair: Replace the faulty wiring.
Turn the keyswitch to the ON position. Ensure that the lamp comes on during the 2 second lamp test.
5. Check the Wiring Between the Lamp Connector and the