Diagnosis Item
13: Diagnose when the M.U.T.-III cannot receive the data sent by engine-ECU
<3000-M/T,
3200 or 3800-M/T> or engine-A/T-ECU <3000-A/T
or
3800-A/T>.
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/W7B54X012A00ENG.png)
![](../../../img/54/AC607564AI00ENG.png)
![](../../../img/54/AC607571AI00ENG.png)
![](../../../img/54/AC607563AC00ENG.png)
![](../../../img/54/AC607569AC00ENG.png)
FUNCTION
The diagnostic result demonstrates that "the M.U.T.-III
cannot receive the sent data from
the engine-A/T-ECU<3000-M/T, 3200 or 3800-M/T>
or
engine-ECU <3000-A/T or 3800-A/T>" when the M.U.T.-III
checks
the periodically sent data from each ECU and cannot receive the
engine-A/T-ECU <3000-M/T,
3200 or 3800-M/T> or engine-ECU <3000-A/T or
3800-A/T> data
only.
TROUBLE JUDGEMENT CONDITIONS
M.U.T.-III judges the trouble when
the periodically sent data from engine-A/T-ECU <3000-M/T,
3200 or 3800-M/T> or engine-ECU <3000-A/T or
3800-A/T> cannot
be received and sent.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Power supply circuit malfunction of the engine-A/T-ECU
<3000-M/T,
3200 or 3800-M/T> or engine-ECU <3000-A/T or
3800-A/T>
- Malfunction of the engine-A/T-ECU <3000-M/T, 3200 or
3800-M/T> or engine-ECU <3000-A/T or
3800-A/T>
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STEP 1. Connector check: D-22 joint connector (CAN2) and
D-215 <3200> or D-245 <petrol powered
vehicles-M/T> engine-ECU
connector or D-216 engine-A/T-ECU connector <3000-A/T or
3800-A/T>
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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-22 joint connector (CAN2) and
D-215 <3200> or D-245 <petrol powered
vehicles-M/T> engine-ECU
connector or D-216 engine-A/T-ECU connector <3000-A/T or
3800-A/T>.
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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 (CAN2) and the engine-ECU
connector <3000-M/T,
3200 or 3800-M/T> or engine-A/T-ECU connector
<3000-A/T
or 3800-A/T>, 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.7 and D-215 engine-ECU
connector terminal No.117 <3200> OK: Continuity (2
Ω or less)
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(5)Continuity between D-22 joint connector (CAN2) terminal
No.12 and D-215 engine-ECU
connector terminal No.125 <3200> OK: Continuity (2
Ω or less)
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(6)Continuity between D-22 joint connector (CAN2) terminal
No.7 and D-245 engine-ECU
connector terminal No.61 <petrol powered
vehicles-M/T> OK: Continuity (2 Ω or less)
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(7)Continuity between D-22 joint connector (CAN2) terminal
No.12 and D-245 engine-ECU
connector terminal No.62 <petrol powered
vehicles-M/T> OK: Continuity (2 Ω or less)
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(8)Continuity between D-22 joint connector (CAN2) terminal
No.7 and D-216 engine-A/T-ECU
connector terminal No.61 <3000-A/T or
3800-A/T> OK: Continuity (2 Ω or less)
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(9)Continuity between D-22 joint connector (CAN2) terminal
No.12 and D-216 engine-A/T-ECU
connector terminal No.62 <3000-A/T or
3800-A/T> 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> Power supply
to the engine-ECU connector <3000-M/T, 3200 or
3800-M/T> or engine-A/T-ECU
connector <3000-A/T or 3800-A/T> may be suspected.
Diagnose the
fuel system (Refer to GROUP 13A - Troubleshooting <3000>,
GROUP 13B - Troubleshooting <3800> or
GROUP 13D - Troubleshooting <3200>).
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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 the engine-ECU
connector <3000-M/T,
3200 or 3800-M/T> or engine-A/T-ECU connector
<3000-A/T
or 3800-A/T>.
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