Diagnosis Item
5: Diagnose shorts in the power supply to CAN-C bus line
| 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
TROUBLE JUDGMENT CONDITIONS
TROUBLESHOOTING HINTS
- Malfunction of the connector (short to power supply in connector)
- Malfunction of the wiring harness (short to power supply in the CAN-C main or sub
bus lines)
- Malfunction of the ECU (ETACS-ECU, or ECUs on CAN-C lines failed)
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STEP 1. Check the wiring harness between C-130 4WD-ECU
connector and C-04 joint connector (CAN2) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to
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- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN2), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-04 joint connector (CAN2) terminal No.5 and body
earth.
OK: 4.7 V or less
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(4)Measure the voltage between C-04 joint connector (CAN2) terminal No.16 and body
earth.
OK: 4.7 V or less
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Q.
Is the check result normal?
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YES <vehicles without ASC> : Go to Step 3.
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YES <vehicles with ASC> : Go to Step 2.
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NO (the check result is not normal.) : Go to Step 7.
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STEP 2. Check the wiring harness between C-209 steering wheel sensor
connector and C-04 joint connector (CAN2) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN2), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-04 joint connector (CAN2) terminal No.4 and body
earth.
OK: 4.7 V or less
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(4)Measure the voltage between C-04 joint connector (CAN2) terminal No.15 and body
earth.
OK: 4.7 V or less
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Q.
Is the check result normal?
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 Go to Step 3.
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 Go to Step 8.
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STEP 3. Check the wiring harness between C-301 ETACS-ECU connector
and C-04 joint connector (CAN2) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN2), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-04 joint connector (CAN2) terminal No.6 <LHD>
or 7 <RHD> and body earth.
OK: 4.7 V or less
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(4)Measure the voltage between C-04 joint connector (CAN2) terminal No.19 <LHD>
or 20 <RHD> and body earth.
OK: 4.7 V or less
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 9.
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STEP 4. Check the wiring harness between B-06 engine-ECU connector <2000>
or B-18 engine-ECU connector <2200> or B-30 engine-ECU connector <2400, 3000> and C-01
joint connector (CAN3) for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN3), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-01 joint connector (CAN3) terminal No.4 and body
earth.
OK: 4.7 V or less
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(4)Measure the voltage between C-01 joint connector (CAN3) terminal No.15 and body
earth.
OK: 4.7 V or less
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Q.
Is the check result normal?
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YES <A/T, CVT> : Go to Step 5.
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YES <M/T> : Go to Step 6.
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NO : Go to Step 10.
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STEP 5. Check the wiring harness between C-136 CVT-ECU connector <CVT>
or C-138 A/T-ECU connector <A/T> and C-01 joint connector (CAN3) for short to power supply (voltage
measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
- Strictly observe the specified wiring harness repair procedure. For details refer
to .
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(1)Disconnect joint connector (CAN3), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-01 joint connector (CAN3) terminal No.7 and body
earth.
OK: 4.7 V or less
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(4)Measure the voltage between C-01 joint connector (CAN3) terminal No.20 and body
earth.
OK: 4.7 V or less
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 11.
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STEP 6. Check the wiring harness between A-02 ABS-ECU connector <vehicles
without ASC> or A-03 ASC-ECU connector <vehicles with ASC> and C-01 joint connector (CAN3)
for short to power supply (voltage measurement).
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| caution |
- A digital multimeter should be used. For details
refer to .
- The test wiring harness should be used. For details refer to .
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(1)Disconnect joint connector (CAN3), and measure at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between C-01 joint connector (CAN3) terminal No.6 and body
earth.
OK: 4.7 V or less
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(4)Measure the voltage between C-01 joint connector (CAN3) terminal No.19 and body
earth.
OK: 4.7 V or less
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Q.
Is the check result normal?
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Check C-37 intermediate connector, and repair if necessary. If the intermediate
connector is in good condition, repair the wiring harness between C-04 joint connector (CAN2)
and C-01 joint connector (CAN3).
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Go to Step 12.
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STEP 7. M.U.T.-III CAN bus diagnostics (checking 4WD-ECU for internal
short to power supply)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-130 4WD-ECU connector, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Check C-35 intermediate connector, and repair if necessary. If the intermediate
connector is in good condition, repair the wiring harness between C-130 4WD-ECU connector and
C-04 joint connector (CAN2).
Check the 4WD-ECU connector, and repair if necessary. If the 4WD-ECU connector
is in good condition, replace the 4WD-ECU.
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STEP 8. M.U.T.-III CAN bus diagnostics (checking the steering wheel
sensor for internal short to power supply)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-209 steering wheel sensor connector, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between C-209 steering wheel sensor connector and C-04
joint connector (CAN2).
Check the steering wheel sensor connector, and repair if necessary. If the steering
wheel sensor connector is in good condition, replace the steering wheel sensor.
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STEP 9. M.U.T.-III CAN bus diagnostics (checking the ETACS-ECU for
internal short to power supply)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-301 ETACS-ECU connector, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between C-301 ETACS-ECU connector and C-04 joint connector
(CAN2).
Check the ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector
is in good condition, replace the ETACS-ECU.
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STEP 10. M.U.T.-III CAN bus diagnostics (checking the engine-ECU for
internal short to power supply)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect B-06 engine-ECU connector <2000> or B-18 engine-ECU connector <2200>
or B-30 engine-ECU connector <2400, 3000>, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between B-06 engine-ECU connector <2000> or B-18
engine-ECU connector <2200> or B-30 engine-ECU connector <2400, 3000> and C-01 joint
connector (CAN3).
Check the engine-ECU connector, and repair if necessary. If the engine-ECU connector
is in good condition, replace the engine-ECU.
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STEP 11. M.U.T.-III CAN bus diagnostics (checking the CVT-ECU <CVT>
or A/T-ECU <A/T> for internal short to power supply)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect C-136 CVT-ECU connector or C-138 A/T-ECU connector <A/T>, and diagnose
the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between C-136 CVT-ECU connector <CVT> or C-138 A/T-ECU
connector <A/T> and C-01 joint connector (CAN3).
Check the CVT-ECU connector <CVT> or A/T-ECU connector <A/T>, and repair
if necessary. If the CVT-ECU connector <CVT> or A/T-ECU connector <A/T> is in good condition,
replace the CVT-ECU <CVT> or A/T-ECU <A/T>.
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STEP 12. M.U.T.-III CAN bus diagnostics (checking the ABS-ECU <vehicles
without ASC> or ASC-ECU <vehicles with ASC> for internal short to power supply)
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| caution |
Strictly observe the specified wiring harness repair procedure.
For details refer to .
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Disconnect A-02 ABS-ECU connector <vehicles without ASC> or A-03 ASC-ECU connector <vehicles
with ASC>, and diagnose the CAN bus line.
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OK: The display of the M.U.T.-III is as shown in the figure.
Q.
Does M.U.T.-III screen correspond to the illustration?
Repair the wiring harness between A-02 ABS-ECU connector <vehicles without
ASC> or A-03 ASC-ECU connector <vehicles with ASC> and C-01 joint connector (CAN3).
Check the ABS-ECU connector <vehicles without ASC> or ASC-ECU connector <vehicles
with ASC>, and repair if necessary. If the ABS-ECU connector <vehicles without ASC> or ASC-ECU
connector <vehicles with ASC> is in good condition, replace the ABS-ECU <vehicles without
ASC> or ASC-ECU <vehicles with ASC>.
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