Diagnosis Item 17: Diagnose when the M.U.T.-III cannot receive the data sent by A/C-ECU
caution | When servicing a CAN bus line, earth
yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component
connected to the CAN bus line may be broken. |
FUNCTION
TROUBLE JUDGMENT CONDITIONS
TROUBLESHOOTING HINTS
- Malfunction of the connector [joint connector (CAN1) or A/C-ECU
connector improperly connected]
- Malfunction of the wiring harness [open circuit between the A/C-ECU
connector and the joint connector (CAN1), or power supply circuit to the A/C-ECU]
- Malfunction of the A/C-ECU
DIAGNOSIS PROCEDURE |
STEP 1. Connector check: C-105 joint connector (CAN1) and C-111 A/C-ECU connector |
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Q.
Is the check result normal?
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Go to Step 2. |
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Repair the defective connector. |
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STEP 2. Check the wiring harness between C-111 A/C-ECU connector and C-105 joint connector (CAN1) |
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(1)Disconnect A/C-ECU connector and joint connector (CAN1), and check the
following wiring harness. |
(2)Check that there is continuity between C-111 A/C-ECU connector terminal
No.11 and C-105 joint connector (CAN1) terminal No.9 <CAN_H> OK: Continuity exists (2 Ω or less) |
(3)Check that there is continuity between C-111 A/C-ECU connector terminal
No.12 and C-105 joint connector (CAN1) terminal No.22 <CAN_L> OK: Continuity exists (2 Ω or less) |
Q.
Is the check result normal?
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Check the power supply circuit of the A/C-ECU. Refer to Group 55 - Troubleshooting . |
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Repair the wiring harness. |
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