Diagnosis Item
25: Diagnose when the M.U.T.-III cannot receive the data sent by e-Call control unit <Vehicles
for RUSSIA>.
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 e-Call control unit" when the M.U.T.-III checks the periodically sent data from each ECU
and cannot receive the e-Call control unit data only.
TROUBLE JUDGEMENT CONDITIONS
M.U.T.-III judges the trouble when the periodically sent data from e-Call control unit
cannot be received.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Power supply circuit malfunction of the e-Call control unit
- Malfunction of the e-Call control unit
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STEP 1. Connector check: joint connector (CAN1) and e-Call control
unit connector
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caution |
The strand end of the twist wire should be within 10 cm from
the connector.
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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 (CAN1) and e-Call control
unit connector.
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caution |
A digital multimeter should be used.
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caution |
The test wiring harness should be used.
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(1)Disconnect joint connector (CAN1) and the e-Call control unit 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.
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Ensure that the negative battery terminal is disconnected.
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(4)Continuity between joint connector (CAN1) terminal No.1 and e-Call control unit
connector terminal No.25. OK: Continuity (2 Ω or less)
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(5)Continuity between joint connector (CAN1) terminal No.12 and e-Call control unit
connector terminal No.24. OK: Continuity (2 Ω or less)
caution |
Strictly observe the specified wiring harness repair procedure.
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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 e-Call control unit may be suspected. Diagnose the KOS (Refer to GROUP 54A - Era-Glonass
System, Troubleshooting ).
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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 the e-Call control unit connector.
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