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Diagnostic Item 34: Diagnose when the scan tool cannot receive the data sent by power liftgate control unit <Vehicles with power liftgate>.
 
 
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 power liftgate control unit" when the scan tool (M.U.T.-III) checks the periodically sent data from each ECU and cannot receive the power liftgate control unit data only.
 
 
TROUBLE JUDGMENT CONDITIONS
Scan tool (M.U.T.-III) judges the trouble when the periodically sent data from power liftgate control unit cannot be received.
 
 
TROUBLESHOOTING HINTS
  • Damaged harness wires and connectors
  • Power supply circuit malfunction of the power liftgate control unit
  • Malfunction of the power liftgate control unit
 
 
DIAGNOSIS
STEP 1. Connector check: joint connector (CAN5) and power liftgate control 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 power liftgate control 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 power liftgate control 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.8 and power liftgate control unit connector terminal No.7
OK: Continuity (2 ohms or less)
(5) Continuity between joint connector (CAN5) terminal No.19 and power liftgate control unit connector terminal No.8
OK: Continuity (2 ohms or less)
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<All the resistances measure 2 ohms or less> Go to Step 3.
: <Either or all of the resistances measure more than 2 ohms> Check the intermediate connector C-23, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN5) and the power liftgate control unit connector.
 
STEP 3. Resistance measurement at power liftgate control unit connector.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the power liftgate control unit, and measure at the equipment side.
(2) Resistance between power liftgate control unit connector terminal Nos.7 and 8
OK: 1 kΩ or more
Is the check result normal?
Power supply to the power liftgate control unit may be suspected. Diagnose the power liftgate. Refer to GROUP 42A - Troubleshooting .
Replace the power liftgate control unit.