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INSPECTION
PROCEDURE A-1: Communication with the SWS monitor is not possible. |
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|  CAUTION
Whenever the ECU is replaced,
ensure that the power supply circuit, the grounding circuit and the communication circuit are
normal.
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| COMMENTS ON TROUBLE SYMPTOM
The SWS monitor may be connected improperly.
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| POSSIBLE CAUSES
- Malfunction of the SWS monitor body (I/F cartridge)
- Malfunction of the SWS monitor harness
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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| Step 1. Check that the MUT-II/III communicates
with the other systems.
Use the MUT-II/III to confirm that it communicates with the other systems.
Q: Is the check result normal?
YES:
Go to Step 2  .
NO:
Diagnose the engine control system. Refer to  <4G64>
or <4G69>.
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| Step 2. Check the MUT-II/III power supply system.
When the ignition switch is turned ON, check if the MUT-II/III can communicate
with the system.
Q: Is the check result normal?
YES:
Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible ."
NO:
Go to Step 3 .
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| Step 3. Connector check: C-219 ETACS-ECU connector Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Repair the defective connector.
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| Step 4. Measure the resistance at the C-219 ETACS-ECU connector. - Disconnect the connector, and measure at the junction block side.
- Resistance between C-219 ETACS-ECU connector terminal No.56 and body earth
OK: 2 Ω
or less
Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Go to Step 5 .
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| Step 5. Check the wiring harness between C-219 ETACS-ECU connector
terminal No.56 and body earth. - Check the earth wires for open circuit.
Q: Are the check results normal?
YES:
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to Cope with Intermittent Malfunction ).
NO:
Repair the wiring harness.
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| Step 6. Connector check: C-24 diagnosis connector Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair the defective connector.
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| Step 7. Check the wiring harness from C-219 ETACS-ECU connector terminal
Nos.51 and 67 to C-24 diagnosis connector terminal Nos.9 and 1. - Check the communication lines for open circuit.
Q: Are the check results normal?
YES:
Replace the ETACS-ECU.
NO:
Repair the wiring harness.
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