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.
|
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 engine-ECU data.
TROUBLE JUDGEMENT CONDITIONS
M.U.T.-III judges the trouble when the periodically sent data from engine-ECU cannot be
received.
PROBABLE CAUSE
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-213 intermediate connector,
joint connector (CAN1) and joint connector (CAN2).
| caution |
The strand end of the twist wire should be within 10 cm from
the connector. For details refer to service precautions.
|
When checking the joint connector, ensure that its wiring harness side and its short pins
are not damaged.
Q.
Is the check result normal?
Go to Step 2.
Repair the defective connector. Replace the joint connector as necessary.
STEP 2. Resistance measurement at joint connector (CAN1) and C-213
intermediate connector.
| 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.
- Strictly observe the specified wiring harness repair procedure. For details refer
to service precautions.
|
|
|
(1)Disconnect the joint connector (CAN1) and the intermediate connector, and measure
at the wiring harness side.
|
|
|
(2)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
(3)
| caution |
When measuring the resistance, disconnect the negative battery terminal.
For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
|
(4)Continuity between joint connector (CAN1) terminal No. 9 and C-213 intermediate
connector terminal No. 1.
OK: Continuity (2 Ω or less)
|
|
|
(5)Continuity between joint connector (CAN1) terminal No. 20 and C-213 intermediate connector
terminal No. 2.
OK: Continuity (2 Ω or less)
|
Q.
Is the check result normal?
<All the resistances measure 2 Ω or less> Go to Step
3.
NO : <Either or all of the resistances measure more than 2 Ω> Repair
the wiring harness between joint connector (CAN1) and intermediate connector C-213.
STEP 3. Resistance measurement at joint connector (CAN2) and C-213
intermediate connector.
| 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.
- Strictly observe the specified wiring harness repair procedure. For details refer
to service precautions.
|
|
|
(1)Disconnect joint connector (CAN2) and the intermediate connector, and measure at
the wiring harness side.
|
|
|
(2)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
(3)
| caution |
When measuring the resistance, disconnect the negative
battery terminal. For details refer to service precautions.
|
Ensure that the negative battery terminal is disconnected.
|
|
|
(4)Continuity between joint connector (CAN2) terminal No. 6 and C-213 intermediate
connector terminal No. 1.
OK: Continuity (2 Ω or less)
|
|
|
(5)Continuity between joint connector (CAN2) terminal No. 17 and C-213 intermediate connector
terminal No. 2.
OK: Continuity (2 Ω or less)
|
Q.
Is the check result normal?
YES <Vehicles for General Export> : <All the resistances measure 2 Ω or less> Follow diagnosis
item 5, 6, 7, 8, 9, 11, 12, 13 and 14. Refer to 
.
YES <Vehicles for GCC> : <All the resistances measure 2 Ω or less> Follow diagnosis
item 5, 6, 7, 11, 13, 14, 15 and 16. Refer to .
NO : <Either or all of the resistances measure more than 2 Ω> Repair
the wiring harness between the joint connector (CAN2) and the intermediate connector.