Diagnosis Item 5: Diagnose when the M.U.T.-III cannot receive the data
sent by combination meter.
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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![](../../../img/54/W7B54X004A00ENG.png)
![](../../../img/54/AC607562AF00ENG.png)
![](../../../img/54/AC607570AF00ENG.png)
FUNCTION
The diagnostic result demonstrates that
"the M.U.T.-III cannot receive the sent data from the combination meter" when
the M.U.T.-III checks the periodically sent data from each ECU and cannot
receive the combination meter data only.
TROUBLE JUDGEMENT CONDITIONS
M.U.T.-III judges the trouble when
the periodically sent data from combination meter cannot be received and sent.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Power supply circuit malfunction of the combination meter
- Malfunction of the combination meter
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STEP 1. Connector check: D-03 joint connector (CAN1) and D-04
combination meter 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 .
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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 D-03 joint connector (CAN1) and D-04
combination meter connector.
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caution |
A digital multimeter should be used. For details
refer to .
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caution |
The test wiring harness should be used. For details
refer to .
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(1)Disconnect joint connector (CAN1) and the combination
meter 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)
caution |
When measuring the resistance, disconnect the
negative battery terminal. For details refer to .
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Ensure that the negative battery terminal is disconnected.
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(4)Continuity between D-03 joint connector (CAN1) terminal
No.3 and D-04 combination meter connector terminal No.23 <LH drive
vehicles> OK: Continuity (2 Ω or less)
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(5)Continuity between D-03 joint connector (CAN1) terminal
No.14 and D-04 combination meter connector terminal No.24 <LH drive
vehicles> OK: Continuity (2 Ω or less)
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(6)Continuity between D-03 joint connector (CAN1) terminal
No.1 and D-04 combination meter connector terminal No.23 <RH drive
vehicles> OK: Continuity (2 Ω or less)
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(7)Continuity between D-03 joint connector (CAN1) terminal
No.12 and D-04 combination meter connector terminal No.24 <RH drive
vehicles> OK: Continuity (2 Ω or less)
caution |
Strictly observe the specified wiring harness repair
procedure. For details refer to .
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Q.
Is the check result normal?
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<All the resistances
measure 2 Ω or less> Go to Step 3.
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<Either or all of the
resistances measure more than 2 Ω> Repair the wiring harness
between joint connector (CAN1) and the combination meter
connector.
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STEP 3. Resistance measurement at D-04 combination meter
connector.
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caution |
A digital multimeter should be used. For details
refer to .
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(1)Remove the combination meter, and measure at the equipment
side.
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(2)Resistance at D-04 combination meter connector terminal
Nos.23 and 24 OK: 120 ± 20 Ω
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Q.
Is the check result normal?
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<Within 120 ± 20
Ω> Power supply to the combination meter may be suspected.
Diagnose the combination meter. Refer to .
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<Not within 120 ± 20
Ω> Replace the combination meter.
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