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Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the Techstream.
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![2019 MY RAV4 HV [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE](/t3Portal/stylegraphics/info.gif)
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Communication stop history for "ECM (Engine)" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "ECM (Engine)" is 6 or more.)
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Communication system DTCs (DTCs that start with U) that correspond to "ECM Communication Stop Mode" in "DTC Combination Table" are output.
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| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001FYGJ |
| Model Year Start: 2019 | Model: RAV4 HV | Prod Date Range: [11/2018 - 02/2019] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): ECM Communication Stop Mode; 2019 MY RAV4 HV [11/2018 - 02/2019] | ||
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ECM Communication Stop Mode |
DESCRIPTION
|
Detection Item |
Symptom |
Trouble Area |
|---|---|---|
|
ECM 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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- Inspect the fuses for circuits related to this system before performing the following procedure.
- Before measuring the resistance of the CAN bus, turn the power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
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After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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Some parts must be initialized and set when replacing or removing and installing parts.
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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 power switch on (IG) 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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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
|
1. |
CHECK FOR OPEN IN CAN BUS WIRE (ECM MAIN WIRE AND BRANCH WIRE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
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(b) Disconnect the ECM connector. |
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(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A24-8 (CANH) - A24-18 (CANL) |
Cable disconnected from negative (-) auxiliary battery terminal |
108 to 132 Ω |
|
A24-7 (CAN+) - A24-17 (CAN-) |
Cable disconnected from negative (-) auxiliary battery terminal |
54 to 69 Ω |
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (No. 3 CAN junction connector main wire) |
B |
|
NG (No. 4 CAN junction connector branch wire) |
C |
| B |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR |
| C |
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REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR |
|
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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 (-) auxiliary battery terminal.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.
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(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A24-1 (BATT) - Body ground |
Power switch off |
11 to 14 V |
|
A24-9 (+B) - Body ground |
Terminal A24-15 (MREL) connected to body ground |
11 to 14 V |
|
A24-35 (+B2) - Body ground |
Terminal A24-15 (MREL) connected to body ground |
11 to 14 V |
|
A24-2 (IGSW) - Body ground |
Power switch on (IG) |
11 to 14 V |
|
Power switch off |
Below 1 V |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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