Code No. C2100:
Abnormal battery voltage (Too low)
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If there is any problem in the CAN bus lines, an incorrect diagnosis
code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.
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OPERATION
4WD-ECU detects a power supply voltage abnormal drop, and if any abnormality occurs, it interrupts
the system.
DIAGNOSIS CODE SET CONDITIONS
If the following conditions are met when the system is activated, 4WD-ECU gradually switches the
control from 4WD to 2WD, flashes the 4WD/LOCK indicators alternately, and sets the
diagnosis code No. C2100.
- IG1 voltage: Less than 8 V
- Voltage between the battery and ETACS-ECU: Less than 8 V
- Engine speed: more than 1500 r/min
PROBABLE CAUSES
Current trouble
- Damaged wiring harness and connectors
- Short to earth or open circuit between the battery and 4WD-ECU
Past trouble
- Intermittent wiring harness or connector failure
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For diagnosis procedures, refer to "How to treat past trouble". (Refer
to GROUP 00, How to Treat Past Trouble  .)
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STEP 1. Battery voltage check
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Check the battery voltage.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Charge or replace the battery.
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STEP 2. Voltage measurement at the ETACS-ECU connector
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(1)Disconnect the C-309 ETACS-ECU connector.
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(2)Measure the voltage between the C-309 harness side connector terminal No. 1 and
the body earth.
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Wiring harness check
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Check the wiring harness between the battery and the C-309 ETACS-ECU connector for damage
or other problem.
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Q.
Is the wiring harness in good condition?
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Go to Step 12.
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Repair damage or other problem in the wiring harness. Then go to Step 12.
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STEP 4. M.U.T.-III CAN bus diagnostics
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .)
On completion, go to Step 5.
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STEP 5. Check whether the diagnosis code is reset after repairing
the CAN bus line.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Start the engine, and continue to run at 1500 r/min or more.
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(4)Check if the diagnosis code is set.
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Q.
Is the diagnosis code No. C2100 set?
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Go to Step 6.
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This diagnosis is complete.
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STEP 6. Check the following connector:
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Check the connectors below for improper engagement, terminal damage or terminal drawn
in the connector case.
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- C-57 4WD-ECU connector
- C-309, C-315 ETACS-ECU connector
- C-27 Intermediate connector
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Q.
Are the connectors and terminals in good condition?
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Go to Step 7.
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Repair the connector(s) or terminal(s). Then go to Step 12.
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STEP 7. Wiring harness check
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Check the wiring harness between the C-57 4WD-ECU connector (No.3) and the C-315 ETACS-ECU
connector (No.4) for damage or other problem.
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Q.
Is the wiring harness in good condition?
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Go to Step 8.
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Repair damage or other problem in the wiring harness. Then go to Step 12.
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STEP 8. Voltage measurement at the 4WD-ECU connector
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(1)Disconnect the C-57 4WD-ECU connector.
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(2)Measure the voltage between the C-57 wiring harness side connector terminals No.
4 (Ignition switch "ON") and the body earth.
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 10.
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STEP 9. Wiring harness check
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Check the wiring harness between the C-57 4WD-ECU connector (terminal No.10) and the body
earth for damage or other problem.
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Q.
Is the wiring harness in good condition?
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Go to Step 11.
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Repair the wiring harness. Then go to Step 12.
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STEP 10. Wiring harness check
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Check the wiring harness between the C-57 4WD-ECU connector (terminal No.4) and the C-309
ETACS-ECU connector (terminal No.1) for damage or other problem.
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Q.
Is the wiring harness in good condition?
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Go to Step 11.
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Repair the wiring harness. Then go to Step 12.
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STEP 11. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Start the engine, and continue to run at 1500 r/min or more.
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(4)Check if the diagnosis code is set.
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Q.
Is the diagnosis code No. C2100 set?
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Replace 4WD-ECU. (Refer to .) Then go to Step
12.
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The trouble can be an intermittent malfunction. (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction .)
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STEP 12. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Start the engine, and continue to run at 1500 r/min or more.
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(4)Check if the diagnosis code is set.
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Q.
Is the diagnosis code No. C2100 set?
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Diagnose again from Step 1.
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This diagnosis is complete.
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