This article describes how to solve the caterpillar 311B EXCAVATOR 2LS MID 161 – CID 0168 – FMI 00 fault
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Conditions that Generate This Code:
This diagnostic code is logged when the diagnostic circuitry within the PL522 and 523 detects a system voltage greater than 32 VDC. Possible causes for this fault are as follows:
• A charging system component has failed.
• A harness wire has failed.
• A PL522 or 523 has failed. A module failure is unlikely.
Note: Determine if a battery charger or welder is in use on the machine.
Disconnect the charger or welder if in use.
Recheck for diagnostic codes.
Test Steps 1.
Check system voltage at the 70-pin connector on the PL522 or 523.
A. Start the engine and run the engine at high idle for 5 to 10 minutes.
B. 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 Result: The voltage is 11 VDC to 32 VDC.
Result:
• OK – The voltage is 11 VDC to 32 VDC. The PL522 or 523 should not log this diagnostic code.
Repair: Clear the diagnostic code from the PL522 or 523 using Caterpillar Electronic Technician (Cat ET). If the voltage is OK and the PL522 or 523 logs this diagnostic code again, replace the PL522 or 523. Before replacing the PL522 or 523, contact your Caterpillar Technical Communicator.
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Stop
• Not OK – Voltage is not 11 VDC to 32 VDC. Go to Test Step 2. Test Step 2. Check the Alternator.
A. Run the engine at high idle for 5 to 10 minutes.
B. Measure the voltage output at the battery terminals.
Expected Results:
The voltage should be less than 32 VDC.
Result:
• OK – Voltage is less than 32 VDC. The battery may be faulty. Go to Test Step 3.
• NOT OK – Voltage is greater than 32 VDC. Troubleshoot the alternator. The voltage regulator may be faulty. If the condition is not corrected, go to Test Step 3.
Test Step 3. Check the battery voltage.
Turn the key start switch to the OFF position. Measure the voltage at the battery terminals.
Expected Result: The voltage should be less than 32 VDC.
Result: • OK – Voltage is less than 32 VDC. Go to Test Step 4.
• NOT OK – Voltage is greater than 32 VDC.
Repair: Refer to Special Instructions, REHS0354, “Charging System Troubleshooting”.
If the condition is not corrected, go to Test Step 4. Test Step 4.
Check each ECM on the machine. Check for logged diagnostic codes for other ECMs installed on the machine.
Compare each ECM that logged a “CID 168 FMI 00” code during the same time period. The SMHs on the log may be different. The difference between the current SMH and the logged SMH is significant.
Expected Result: Other “CID 168 FMI 00” diagnostic codes may be found on other Electronic Control Modules (ECMs).
Result: • Yes – Other “CID 168 FMI 00” diagnostic codes may be found on other Electronic Control Modules (ECMs).
Fix: Clear the fault if all of the following conditions occur: ◦ No faults were found in the charging system.
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◦ No faults were found in the wires.
◦ The fault has recurred several times.
Monitor the module and machine for further faults. If the fault recurs, the PL522 or 523 module is not faulty because other electronic control modules are showing the same fault. Recheck system voltages.
STOP
• No – No other “CID 168 FMI 00” diagnostic code can be found on other ECMs.
Repair: Clear the fault if all of the following conditions occur:
◦ No fault is found in the charging system.
◦ No fault is found in the wiring. ◦ The fault has recurred several times.
Monitor the module and machine for further faults. If the fault recurs, the PL522 or 523 module may be faulty. The PL522 or 523 should be replaced. Refer to Systems Operation, Troubleshooting, Testing and Adjusting, “Electronic Control Module (ECM) – Replacement”. After replacing the PL522 or 523, recheck the system and check the status of the diagnostic code.
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