Code No.B2101
IG SW start POS circuit low
Code No.B2102 IG SW start POS circuit high
caution |
- If the diagnosis
code No. B2101 or B2102 is set in KOS-ECU, always diagnose the CAN bus lines.
- Before replacing the ECU, ensure that the communication circuit is normal.
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TROUBLE JUDGEMENT
If the actual engine switch status is different from the engine switch status information
received from ETACS-ECU via CAN, KOS-ECU sets the diagnosis code No. B2101 or B2102.
JUDGEMENT CRITERIA
If the engine switch status is infeasible consecutively ten times the KOS-ECU will judge
that the system is defective.
B2101
- Engine switch power supply mode: OFF
- Engine switch information from ETACS-ECU: ON
B2102
- Engine switch power supply mode: ON
- Engine switch information from ETACS-ECU: OFF
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of the KOS-ECU
- Malfunction of the OSS-ECU
- Damaged wiring harness and connectors
- Malfunction of ETACS-ECU
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 2.
STEP 2. M.U.T.-III other system diagnosis code
Check if any diagnosis code is set to the OSS-ECU.
Q.
Is the diagnosis code set?
Perform troubleshooting for the OSS-ECU (Refer to Troubleshooting ).
On completion, go to Step 3.
Go to Step 3
STEP 3. M.U.T.-III other system data list
Use M.U.T.-III to check the ETACS-ECU service data. (Refer to GROUP 54A - ETACS-ECU,
Service Data Reference List ).
OK: System voltage
Q.
Is the check result normal?
Go to Step 4
Perform troubleshooting for ETACS-ECU (Refer to GROUP 54A - ETACS-ECU - Troubleshooting ).
STEP 4. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the power supply mode of the engine switch from OFF to ON.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace KOS-ECU and register the ID codes (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).