Diagnosis Item 4: Diagnose shorts in the earth 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 JUDGEMENT CONDITIONS
TROUBLESHOOTING HINTS
- Malfunction of the connector (short to earth inside connector)
- Malfunction of the wiring harness (short to earth 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-301 ETACS-ECU connector and C-03 joint connector (CAN2) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to
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- 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)Resistance between C-03 joint connector (CAN2) terminal No.6 and body earth.
OK: 1 kΩ or more
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(3)Resistance between C-03 joint connector (CAN2) terminal No.19 and body earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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YES <vehicles with ASC or AFS> : Go to Step 2.
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YES <vehicles without ASC or AFS> : Go to Step 5.
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NO : Go to Step 15.
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STEP 2. Check the wiring harness between C-211 steering wheel sensor connector and C-03 joint connector (CAN2) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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)Resistance between C-03 joint connector (CAN2) terminal No.7 <LHD> or 5 <RHD> and body earth.
OK: 1 kΩ or more
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(3)Resistance between C-03 joint connector (CAN2) terminal No.20 <LHD> or 16 <RHD> and body earth.
OK: 1 kΩ or more
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Q.
Is the check result normal?
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YES <except RALLIART (vehicles with AFS) > : Go to Step 4.
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YES <except RALLIART (vehicles without AFS) > : Go to Step 5.
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YES <RALLIART> : Go to Step 3.
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NO : Go to Step 13.
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STEP 3. Check the wiring harness between C-44 AWC-ECU connector and C-03 joint connector (CAN2) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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)Resistance between C-03 joint connector (CAN2) terminal No.4 <LHD> or 7 <RHD> and body earth.
OK: 1 kΩ or more
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(3)Resistance between C-03 joint connector (CAN2) terminal No.15 <LHD> or 20 <RHD> and body earth.
OK: 1 kΩ or more
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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 14.
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STEP 4. Check the wiring harness between C-12 AFS-ECU connector and C-124 joint connector (CAN3) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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)Resistance between C-124 joint connector (CAN3) terminal No.8 <except 2000-Diesel> or No.7 <2000-Diesel> and body earth
OK: 1 kΩ or more
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(3)Resistance between C-124 joint connector (CAN3) terminal No.21 <except 2000-Diesel> or No.20 <2000-Diesel> and body earth
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 16.
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STEP 5. Check the wiring harness between A-04 ABS-ECU connector <vehicles without ASC> or A-58 ASC-ECU connector <vehicles with ASC> and C-124 joint connector (CAN3) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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)Resistance between C-124 joint connector (CAN3) terminal No.6 and body earth
OK: 1 kΩ or more
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(3)Resistance between C-124 joint connector (CAN3) terminal No.19 and body earth
OK: 1 kΩ or more
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Q.
Is the check result normal?
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YES <A/T or CVT> : Go to Step 6.
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YES <M/T (vehicles with electric power steering) > : Go to Step 7.
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YES <M/T (vehicles without electric power steering) > : Go to Step 8.
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YES <TC-SST> : Go to Step 9.
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NO : Go to Step 17.
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STEP 6. Check the wiring harness between C-32 A/T-ECU connector <1500> or C-35 CVT-ECU connector <1800, 2000-Petrol> and C-124 joint connector (CAN3) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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)Resistance between C-124 joint connector (CAN3) terminal No.7 and body earth
OK: 1 kΩ or more
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(3)Resistance between C-124 joint connector (CAN3) terminal No.20 and body earth
OK: 1 kΩ or more
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Q.
Is the check result normal?
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YES <vehicles with electric power steering> : Go to Step 7.
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YES <vehicles without electric power steering> : Go to Step 8.
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NO : Go to Step 18.
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STEP 7. Check the wiring harness between C-114 electric power steering-ECU connector and C-124 joint connector (CAN3) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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)Resistance between C-124 joint connector (CAN3) terminal No.3 and body earth
OK: 1 kΩ or more
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(3)Resistance between C-124 joint connector (CAN3) terminal No.14 and body earth
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 19.
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STEP 8. Check the wiring harness between B-09 <except 2000-Diesel> or B-28 <2000-Diesel> engine-ECU connector and C-124 joint connector (CAN3) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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)Resistance between C-124 joint connector (CAN3) terminal No.4 and body earth
OK: 1 kΩ or more
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(3)Resistance between C-124 joint connector (CAN3) terminal No.15 and body earth
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Check C-128 intermediate connector, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between C-03 joint connector (CAN2) and C-124 joint connector (CAN3).
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Go to Step 20.
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STEP 9. Check the wiring harness between C-58 shift lever connector and C-124 joint connector (CAN3) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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)Resistance between C-124 joint connector (CAN3) terminal No.7 and body earth
OK: 1 kΩ or more
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(3)Resistance between C-124 joint connector (CAN3) terminal No.20 and body earth
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 21.
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STEP 10. Check the wiring harness between B-09 engine-ECU connector <RALLIART> and A-66 joint connector (CAN4) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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 (CAN4), and measure at the wiring harness side.
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(2)Resistance between A-66 joint connector (CAN4) terminal No.6 and body earth
OK: 1 kΩ or more
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(3)Resistance between A-66 joint connector (CAN4) terminal No.19 and body earth
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 11.
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Go to Step 20.
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STEP 11. Check the wiring harness between B-125 transmission assembly (TC-SST-ECU) connector and A-66 joint connector (CAN4) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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 (CAN4), and measure at the wiring harness side.
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(2)Resistance between A-66 joint connector (CAN4) terminal No.7 and body earth
OK: 1 kΩ or more
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(3)Resistance between A-66 joint connector (CAN4) terminal No.20 and body earth
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Go to Step 12.
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Go to Step 22.
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STEP 12. Check the wiring harness between C-03 joint connector (CAN2) and C-124 joint connector (CAN3) for short to earth (resistance measurement)
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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 the resistance at the wiring harness side of joint connector (CAN3).
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(2)Resistance between C-124 joint connector (CAN3) terminal No.5 and body earth
OK: 1 kΩ or more
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(3)Resistance between C-124 joint connector (CAN3) terminal No.16 and body earth
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Check A-65 intermediate connector, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between C-124 joint connector (CAN3) and A-66 joint connector (CAN4).
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Check C-128 intermediate connector, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between C-03 joint connector (CAN2) and C-124 joint connector (CAN3).
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STEP 13. M.U.T.-III CAN bus diagnostics (checking the steering wheel sensor for internal short to earth)
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| caution |
Strictly observe the specified wiring harness repair procedure. For details refer to .
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Disconnect C-211 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-211 steering wheel sensor connector and C-03 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 14. M.U.T.-III CAN bus diagnostics (checking the AWC-ECU for internal short to earth)
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| caution |
Strictly observe the specified wiring harness repair procedure. For details refer to .
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Disconnect C-44 AWC-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-44 AWC-ECU connector and C-03 joint connector (CAN2).
Check the AWC-ECU connector, and repair if necessary. If the AWC-ECU connector is in good condition, replace the AWC-ECU.
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STEP 15. Check the wiring harness between C-301 ETACS-ECU connector and C-03 joint connector (CAN2) for short to earth (resistance measurement).
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| caution |
- Disconnect the negative battery terminal. For details refer to .
- 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 ETACS-ECU connector and joint connector (CAN2), and measure at the wiring harness side.
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(2)Measure the resistance between C-03 joint connector (CAN2) terminal No.6 and body earth. <CAN_H>
OK: 1 kΩ or more
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(3)Measure the resistance between C-03 joint connector (CAN2) terminal No.19 and body earth. <CAN_L>
OK: 1 kΩ or more
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Q.
Is the check result normal?
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Check the ETACS-ECU connector, replace and repair if necessary. If the ETACS-ECU connector is in good condition, ETACS-ECU.
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Repair the wiring harness between C-301 ETACS-ECU connector and C-03 joint connector (CAN2).
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STEP 16. M.U.T.-III CAN bus diagnostics (checking the AFS-ECU for internal short to earth)
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| caution |
Strictly observe the specified wiring harness repair procedure. For details refer to .
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Disconnect C-12 AFS-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-12 AFS-ECU connector and C-124 joint connector (CAN3).
Check the AFS-ECU connector, and repair if necessary. If the AFS-ECU connector is in good condition, replace the AFS-ECU.
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STEP 17. M.U.T.-III CAN bus diagnostics (checking the ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles with ASC> for internal short to earth)
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| caution |
Strictly observe the specified wiring harness repair procedure. For details refer to .
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Disconnect A-04 ABS-ECU connector <vehicles without ASC> or A-58 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-04 ABS-ECU connector <vehicles without ASC> or A-58 ASC-ECU connector <vehicles with ASC> and C-124 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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STEP 18. M.U.T.-III CAN bus diagnostics (checking the A/T-ECU <1500> or CVT-ECU <1800, 2000-Petrol> for internal short to earth)
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| caution |
Strictly observe the specified wiring harness repair procedure. For details refer to .
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Disconnect C-32 A/T-ECU connector <1500> or C-35 CVT-ECU connector <1800, 2000-Petrol>, 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-32 A/T-ECU connector <1500> or C-35 CVT-ECU connector <1800, 2000-Petrol> and C-124 joint connector (CAN3).
Check the A/T-ECU connector <1500> or CVT-ECU connector <1800, 2000-Petrol>, and repair if necessary. If the A/T-ECU connector <1500> or CVT-ECU connector <1800, 2000-Petrol> is in good condition, replace the A/T-ECU connector <1500> or CVT-ECU connector <1800, 2000-Petrol>.
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STEP 19. M.U.T.-III CAN bus diagnostics (checking the electric power steering-ECU for internal short to earth)
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| caution |
Strictly observe the specified wiring harness repair procedure. For details refer to .
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Disconnect C-114 electric power steering-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-114 electric power steering-ECU connector and C-124 joint connector (CAN3).
Check the electric power steering-ECU connector, and repair if necessary. If the electric power steering-ECU connector is in good condition, replace the electric power steering-ECU.
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STEP 20. M.U.T.-III CAN bus diagnostics (checking the engine-ECU for internal short to earth)
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| caution |
Strictly observe the specified wiring harness repair procedure. For details refer to .
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Disconnect B-09 <except 2000-Diesel> or B-28 <2000-Diesel> engine-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?
YES <except RALLIART> : Repair the wiring harness between B-09 <except 2000-Diesel> or B-28 <2000-Diesel> engine-ECU connector and C-124 joint connector (CAN3).
YES <RALLIART> : Check A-65 intermediate connector, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between B-09 engine-ECU connector and A-66 joint connector (CAN4).
NO : 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 21. M.U.T.-III CAN bus diagnostics (checking the shift lever for internal short to earth)
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| caution |
Strictly observe the specified wiring harness repair procedure. For details refer to .
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Disconnect C-58 shift lever 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-58 shift lever connector and C-124 joint connector (CAN3).
Check the shift lever connector, and repair if necessary. If the shift lever connector is in good condition, replace the shift lever.
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STEP 22. M.U.T.-III CAN bus diagnostics (checking the transmission assembly (TC-SST-ECU) for internal short to earth)
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| caution |
Strictly observe the specified wiring harness repair procedure. For details refer to .
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Disconnect B-125 transmission assembly (TC-SST-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 B-125 transmission assembly (TC-SST-ECU) connector and A-66 joint connector (CAN4).
Check the transmission assembly connector, and repair if necessary. If the transmission assembly (TC-SST-ECU) connector is in good condition, replace the transmission assembly.
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