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Communication stop for "Four Wheel Drive Control" is indicated on the "Communication Bus Check" screen of the Techstream.
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![2020 MY Camry [03/2020 - 10/2020]; NETWORKING: CAN COMMUNICATION SYSTEM: PROBLEM SYMPTOMS TABLE](/t3Portal/stylegraphics/info.gif)
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Communication stop history for "Four Wheel Drive Control" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Four Wheel Drive Control" is 6 or more.)
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Communication system DTCs (DTCs that start with U) that correspond to "4WD Control ECU Communication Stop Mode" in "DTC Combination Table" are output.
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| Last Modified: 11-20-2023 | 6.11:8.1.0 | Doc ID: RM100000001MOHJ |
| Model Year Start: 2020 | Model: Camry | Prod Date Range: [03/2020 - ] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM: 4WD Control ECU Communication Stop Mode; 2020 - 2024 MY Camry [03/2020 - ] | ||
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4WD Control ECU Communication Stop Mode |
DESCRIPTION
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Detection Item |
Symptom |
Trouble Area |
|---|---|---|
|
4WD Control ECU Communication Stop Mode |
Any of the following conditions are met: |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
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Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
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- Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
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After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
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After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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- Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
- Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
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1. |
CHECK FOR OPEN IN CAN BUS LINES (4WD ECU ASSEMBLY BRANCH LINE) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the K145 4WD ECU assembly connector.
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(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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| NG |
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REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (4WD ECU ASSEMBLY) |
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2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
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(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(b) Reconnect the cable to the negative (-) battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
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Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K145-3 (IG1) - Body ground |
Ignition switch ON |
11 to 14 V |
| OK |
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REPLACE 4WD ECU ASSEMBLY
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| NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
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