This article describes how to solve the caterpillar 311B EXCAVATOR 2LS MID 161 - CID 0168 - FMI 01 fault
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Conditions that Generate This Code: When the PL522 and 523 detect a battery voltage below 11 VDC, the system will log this diagnostic code.
Test Step 1. Check the system voltage at the 70-pin connector on the PL522 and 523 modules.
Start the engine and run the engine at high idle for 5 to 10 minutes. Measure the system voltage between the "Unswitched Power" and "Ground" contacts. Pin 52 is the "Unswitched Power" terminal and pin 65 is the "Ground" terminal.
Expected Results: The voltage on a 24 VDC system is 27 VDC to 29 VDC. The voltage on a 12 VDC system is 13 VDC to 15 VDC.
Results: • OK - The voltage is correct. Clear this diagnostic code and check for other diagnostic codes. Stop • Abnormal - The voltage is not normal. Go to Test Step 2. Test Step 2. Check the Alternator.
Run the engine at high idle for 5 to 10 minutes. Measure the voltage output at the battery terminals.
Expected Results: For a 24 VDC system, the voltage should be in the range of 27 VDC to 29 VDC. For a 12 VDC system, the voltage should be in the range of 13 VDC to 15 VDC.
Results: • OK - The voltage is correct. Go to Test Step 3.
• NOT OK - The voltage is not normal.
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Repair: Repair or replace the alternator. 311B TRACK-TYPE EXCAVATORS 2LS00001-UP (MACHINE) POWERED BY ... Page 1 of 2
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Stop Test Step 3. Check Battery Voltage. Turn the key switch to the OFF position. Measure the voltage at the battery terminals. Always wear appropriate personal protective equipment.
Expected Results: The voltage should be between 12 VDC and 15 VDC for a 12 VDC system. The voltage should be between 24 VDC and 27 VDC for a 24 VDC system.
Results: • OK - The voltage is between 12 VDC and 15 VDC, or the voltage is between 24 VDC and 27 VDC.
Repair: PL522 or 523 may be malfunctioning. Recheck the system before replacing PL522 or 523. PL522 or 523 is rarely the source of the fault. Refer to Systems Operation, Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replacement". After replacing PL522 or 523, recheck the system and check the status of the diagnostic code.
STOP • NOT OK - The voltage is not between 12 VDC and 15 VDC, or the voltage is not between 24 VDC and 27 VDC.
Repair: Refer to Special Instructions, REHS0354, "Charging System Troubleshooting". If the condition does not improve, PL522 or 523 may be malfunctioning. Recheck the system before replacing PL522 or 523. PL522 or 523 is rarely the source of the fault. Refer to Systems Operation, Troubleshooting, Testing and Adjusting,
"Electronic Control Module (ECM) - Replace". After replacing PL522 or 523, recheck the system and check the status of the diagnostic code.
STOP
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