[ 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 20
Diagnosis Item 20: Diagnose when the M.U.T.-IIISE cannot receive the data sent by engine-ECU.
 
 
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 engine-ECU" when the M.U.T.-IIISE checks the periodically sent data from each ECU and cannot receive the engine-ECU data only.
 
 
TROUBLE JUDGEMENT CONDITIONS
M.U.T.-IIISE judges the trouble when the periodically sent data from engine-ECU cannot be received.
 
 
PROBABLE CAUSES
  • Damaged harness wires and connectors
  • Power supply circuit malfunction of the engine-ECU
  • Malfunction of the engine-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. Connector check: joint connector (CAN4) and engine-ECU 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 (CAN4) and engine-ECU connector.
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect the joint connector (CAN4) and the engine-ECU 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 (CAN4) terminal No.10 and engine-ECU connector terminal No.151
OK: Continuity (2 Ω or less)
(5) Continuity between joint connector (CAN4) terminal No.21 and engine-ECU connector terminal No.152
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 (CAN4) and the engine-ECU.
 
STEP 3. Resistance measurement at engine-ECU connector.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the engine-ECU, and measure at the equipment side.
(2) Resistance between engine-ECU connector terminal Nos.151 and 152
OK: 120 ± 20 Ω
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<Within 120 ± 20 Ω> Power supply to the engine-ECU may be suspected. Diagnose the fuel system. Refer to GROUP 13A - Symptom procedure - Engine-ECU Power Supply, Engine Control Relay, Ignition Switch-IG1 System .
<Not within 120 ± 20 Ω> Replace the engine-ECU.