Diagnosis code
No.02 Communication error with column switch
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If diagnosis code No. 02
is set in the ETACS-ECU, diagnose the CAN bus
lines.
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The ETACS-ECU communicates with the
column switch through the SWS communication lines.
If there is any trouble in that communication, diagnosis
code No. 02 will be set.
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COMMENT ON TROUBLE SYMPTOM
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The column switch, the ETACS-ECU,
connector(s), or wiring harness between the two may
be defective.
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- Malfunction of the column switch
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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Step 1. M.U.T.-III CAN bus diagnostics
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Use the 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
2.
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 Correct the CAN bus
line. (Refer to Group 54F - Diagnosis  .)
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Step 2. Use the M.U.T.-III to confirm a diagnosis code.
(M.U.T.-III diagnosis
code)
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(2)On completion, check that diagnosis code No.02 is
not reset.
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Q.
Is diagnosis code No.02 set?
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Go to Step
3.
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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 3. Connector check: C-301 column switch
connector
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Q.
Is the check result normal?
Go to Step
4.
Repair
the defective connector.
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Step 4. Voltage measurement at the C-301 column switch
connector.
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(1)Disconnect the connector, and
measure at the wiring harness side.
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(2)Voltage between C-301 column
switch connector No.1 and body earth
OK: System
voltage
Q.
Is the check result normal?
Go to Step
6.
Go to Step
5.
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Step 5. Check the wiring harness between C-301 column
switch connector
terminal No.1 to fusible link (26).
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| note |
Prior to the wiring harness
inspection, check intermediate connectors C-125,
and repair
if necessary.
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- Check the power supply line for open
circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
Repair the wiring
harness.
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Step 6. Resistance measurement at the C-301 column
switch connector.
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(1)Disconnect the connector, and
measure at the wiring harness side.
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(2)Continuity between C-301 column
switch connector No.4 and body earth
OK: 2
Ω or less
Q.
Is the check result normal?
Go to Step
8.
Go to Step
7.
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Step 7. Check the wiring harness between C-301 column
switch connector
No.4 to body earth
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- Check the earth wires for open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
Repair the wiring
harness.
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Step 8. Connector check: C-221 ETACS-ECU
connector
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Q.
Is the check result normal?
Go to Step
9.
Repair
the defective connector.
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Step 9. Check the wiring harness from C-221 ETACS-ECU
connector terminal
Nos. 59 and 68 to C-301 column switch connector terminal
Nos. 3 and 2.
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Prior to the wiring harness
inspection, check joint connector C-01, and
repair if necessary.
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- Check the communication lines for open
circuit.
Q.
Is the check result normal?
Go to Step
10.
Repair
the wiring harness.
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Step 10. Check whether the diagnosis code is
reset.
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Replace the column switch, and then
check that the diagnosis code is not reset.
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(1)Replace the column switch.
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(3)On completion, check that diagnosis code No.02 is
not reset.
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Q.
Is diagnosis code No.02 set?
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Replace the
ETACS-ECU.
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The procedure is
complete.
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