[Previous][Next]
Diagnostic Item 15: Diagnose when the scan tool cannot receive the data sent by transaxle control module (ECM). <CVT>
 
 
cautionWhen servicing a CAN bus line, ground 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 scan tool (M.U.T.-III) cannot receive the sent data from the transaxle control module (ECM)" when the scan tool (M.U.T.-III) checks the periodically sent data from each ECU and cannot receive the transaxle control module (ECM) data only.
 
 
TROUBLE JUDGMENT CONDITIONS
scan tool (M.U.T.-III) judges the trouble when the periodically sent data from transaxle control module (ECM) cannot be received.
 
 
PROBABLE CAUSES
  • Damaged harness wires and connectors
  • Power supply circuit malfunction of the transaxle control module (ECM)
  • Malfunction of the transaxle control module (ECM)
 
 
DIAGNOSIS
STEP 1. Connector check: joint connector (CAN2) and transaxle control module (ECM) connector
cautionThe strand end of the twist wire should be within 10 cm (4 inches) 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 (CAN2) and transaxle control module (ECM) 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 (CAN2) and the transaxle control module (ECM) 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 (CAN2) terminal No.7 and transaxle control module (ECM) connector terminal No.9
OK: Continuity (2 Ω or less)
(5) Continuity between joint connector (CAN2) terminal No.18 and transaxle control module (ECM) connector terminal No.10
OK: Continuity (2 Ω or less)
Is the check result normal?
<All the resistances measure 2 Ω or less> Power supply to the transaxle control module (ECM) may be suspected.
<Either or all of the resistances measure more than 2 Ω> Check the intermediate connector, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN2) and the transaxle control module (ECM) connector.