[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54C-CONTROLLER AREA NETWORK (CAN) > TROUBLESHOOTING<CAN><CAN> > CAN BUS DIAGNOSIS > DIAGNOSIS ITEM 30
Diagnosis Item 30: Diagnose when the M.U.T.-IIISE cannot receive the data sent by CAN box unit. <vehicles with MMCS>
 
 
cautionWhen 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 "the M.U.T.-IIISE cannot receive the sent data from the CAN box unit" when the M.U.T.-IIISE checks the periodically sent data from each ECU and cannot receive the CAN box unit data only.
 
 
TROUBLE JUDGEMENT CONDITIONS
M.U.T.-IIISE judges the trouble when the periodically sent data from CAN box unit cannot be received.
 
 
PROBABLE CAUSES
  • Damaged harness wires and connectors
  • Power supply circuit malfunction of the CAN box unit
  • Malfunction of the CAN box unit
 
 
DIAGNOSIS PROCEDURE
STEP 1. Connector check: joint connector (CAN5) and CAN box unit connector
cautionThe strand end of the twist wire should be within 10 cm from the connector. For details refer to .
When checking the joint connector, ensure that its wiring harness side and its short pins are not damaged.
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 (CAN5) and CAN box unit connector.
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect joint connector (CAN5) and the CAN box unit connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3)
cautionWhen measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.
(4) Continuity between joint connector (CAN5) terminal No.9 and CAN box unit connector terminal No.14
OK: Continuity (2 Ω or less)
(5) Continuity between joint connector (CAN5) terminal No.20 and CAN box unit connector terminal No.13
OK: Continuity (2 Ω or less)
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
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 (CAN5) and the CAN box unit connector.
 
STEP 3. Resistance measurement at CAN box unit connector.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the CAN box unit, and measure at the equipment side.
(2) Resistance between CAN box unit connector terminal Nos.14 and 13
OK: 1 kΩ or more
Is the check result normal?
Power supply to the CAN box unit may be suspected. Diagnose the MMCS. Refer to GROUP 54A - Symptom chart .
Replace the CAN box unit.