Diagnosis Item 10: Diagnose the lines between the joint connectors (CAN1
and CAN2).
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
"Diagnose the lines between the joint connectors (CAN1 and CAN2)" when the
M.U.T.-III checks the periodically sent data from each ECU and cannot receive
the ASTC-ECU and the combination meter data.
TROUBLE JUDGEMENT CONDITIONS
M.U.T.-III judges the trouble when
the periodically sent data from ASTC-ECU and the combination meter cannot be
received and sent.
PROBABLE CAUSE
Damaged harness wires and connectors
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STEP 1. Connector check: D-230 intermediate connector, D-03 joint
connector (CAN1) and D-22 joint connector (CAN2)
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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-230
intermediate 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 the joint connector (CAN1) and the intermediate
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.11 and D-230 intermediate connector terminal No.13 OK:
Continuity (2 Ω or less)
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(5)Continuity between D-03 joint connector (CAN1) terminal
No.22 and D-230 intermediate connector terminal No.12 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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NO : <Either or all of the resistances
measure more than 2 Ω> Repair the wiring harness between joint
connector (CAN1) and intermediate connector (D-230).
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STEP 3. Resistance measurement at D-22 joint connector (CAN2) and D-230
intermediate 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 (CAN2) and the intermediate
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-22 joint connector (CAN2) terminal
No.2 and D-230 intermediate connector terminal No.13 OK:
Continuity (2 Ω or less)
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(5)Continuity between D-22 joint connector (CAN2) terminal
No.5 and D-230 intermediate connector terminal No.12 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> Follow diagnosis item 5, 6, 7, 8, 9, 11, 12, 13, 14
and 15 (Refer to ).
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NO : <Either or all of the resistances
measure more than 2 Ω> Repair the wiring harness between joint
connector (CAN2) and intermediate connector (D-230).
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