Diagnosis Item
27: Diagnose when the M.U.T.-III cannot receive the data sent by gateway-ECU (for smartphone
link display audio).
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.
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FUNCTION
The diagnostic result demonstrates that "the M.U.T.-III cannot receive the sent data from
the gateway-ECU (for smartphone link display audio)" when the M.U.T.-III checks the periodically
sent data from each ECU and cannot receive the gateway-ECU (for smartphone link display audio)
data only.
TROUBLE JUDGEMENT CONDITIONS
M.U.T.-III judges the trouble when the periodically sent data from gateway-ECU (for smartphone
link display audio) cannot be received.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Power supply circuit malfunction of the gateway-ECU (for smartphone link display
audio)
- Malfunction of the gateway-ECU (for smartphone link display audio)
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STEP 1. Connector check: joint connector (CAN4) and gateway-ECU
(for smartphone link display audio) connector
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caution |
The strand end of the twist wire should be within 10 cm from
the connector. For details refer to service precautions.
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When checking the joint connector, ensure that its wiring harness side and its short pins
are not damaged.
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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. Replace the joint connector as necessary.
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STEP 2. Resistance measurement at joint connector (CAN4) and gateway-ECU
(for smartphone link display audio) connector.
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caution |
- A digital multimeter should
be used. For details refer to service precautions.
- The test wiring harness should be used. For details refer to service precautions.
- When measuring the resistance, disconnect the negative battery terminal. For details
refer to service precautions.
- Strictly observe the specified wiring harness repair procedure. For details refer
to service precautions.
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(1)Disconnect joint connector (CAN4) and the gateway-ECU (for smartphone link display
audio) connector, and measure at the wiring harness side.
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(2)Turn the ignition switch to the "LOCK" (OFF) position.
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(3)Ensure that the negative battery terminal is disconnected.
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(4)Continuity between joint connector (CAN4) terminal No.2 and gateway-ECU (for smartphone
link display audio) connector terminal No. 3. OK: Continuity (2 Ω or less)
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(5)Continuity between joint connector (CAN4) terminal No.13 and gateway-ECU (for smartphone
link display audio) connector terminal No. 2. OK: Continuity (2 Ω or less)
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Q.
Is the check result normal?
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<All the resistances measure 2 Ω or less> Power supply
to the gateway-ECU (for smartphone link display audio) may be suspected. Diagnose the gateway-ECU
(for smartphone link display audio).
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NO : <Either or all of the resistances measure more than 2 Ω> Repair
the wiring harness between joint connector (CAN4) and the gateway-ECU (for smartphone link display
audio) connector.
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