Real Time AWD System Symptom Troubleshooting - HDS does not communicate (AWD (With CAN Gateway)) (2020 2021)
HDS does not communicate
NOTE: Information marked with an asterisk (*1) applies to the model not equipped with auto idle stop system, and an asterisk (*2) applies to the model equipped with auto idle stop system.
- HDS communication check
-1. Turn the vehicle to the ON mode.
-2. Check that the HDS communicates with the vehicle.
Does the HDS communicate with the vehicle?
YES
The HDS communication is OK. Go to step 2.
NO
- AWD system communication check
-1. Check the Main Menu of the REAL TIME AWD with the HDS.
Does the HDS show the Main Menu of the REAL TIME AWD?
YES
The real time AWD system communication is OK. Intermittent failure, the system is OK at this time.
NO
Go to step 3.
- Fuse check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Check the following fuse.
Fuse No. A20 Fuse No. D7 Fuse No. F6*2 Is the fuse OK?
YES
The fuses is OK. Reinstall the fuses, then go to step 4.
NO
Replace the fuse (s). If the fuse (s) blows again, repair a short to ground in the fuse (s) circuit, and recheck.
- Rear differential pump motor operation check
-1. Turn the vehicle to the ON mode.
-2. Check the operation sound of the rear differential pump motor on the rear differential with a stethoscope or a flat-tipped screwdriver (at the rear differential pump motor) when the engine started.
NOTE: The rear differential pump motor operates within several seconds after the engine is started.
Rear differential pump motor operation sound heard?
YES
Go to step 9.
NO
Go to step 5.
- Rear differential fluid pressure sensor check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connector.
Rear differential fluid pressure sensor 3P connector -3. Turn the vehicle to the ON mode.
-4. Check the Main Menu of the REAL TIME AWD with the HDS.
Does the HDS show the Main Menu of the REAL TIME AWD?
YES
Replace the rear differential fluid pressure sensor .
NO
The rear differential fluid pressure sensor is OK. Go to step 6.
- Open wire check (IG1 METER line *1/IG1 VST line *2):
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connector.
AWD control unit 24P connector -3. Start the engine.
-4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode (idling) Rear differential fluid pressure sensor 3P connector: disconnected AWD control unit 24P connector: disconnected Test point 1 AWD control unit 24P connector No. 12 Test point 2 Body ground Is there battery voltage?
YES
The IG1 METER wire *1/IG1 VST wire *2 is OK. Go to step 7.
NO
Repair an open in the IG1 METER wire *1/IG1 VST wire *2 between the real time AWD control unit and the under-dash fuse/relay box *1/auxiliary under-dash fuse/relay box *2.
- Open wire check (GND line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Rear differential fluid pressure sensor 3P connector: disconnected AWD control unit 24P connector: disconnected Test point 1 AWD control unit 24P connector No. 8 Test point 2 Body ground Is there 1.0 Ω or less?
YES
The GND wire is OK. Go to step 8.
NO
Repair an open in the GND wire between the AWD control unit and ground (G503).
- Shorted wire check (SVCC line)
-1. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Rear differential fluid pressure sensor 3P connector: disconnected AWD control unit 24P connector: disconnected Test point 1 AWD control unit 24P connector No. 20 Test point 2 Body ground Is there 1 MΩ or more?
YES
The SVCC wire is OK. Go to step 9.
NO
Repair a short to ground in the SVCC wire between the AWD control unit and the rear differential fluid pressure sensor.
- Open wire check (F-CAN B H, F-CAN B L lines)
-1. Disconnect the following connector.
CAN gateway 16P connector -2. Measure the resistance between test points 1 and 2 individually.
F-CAN B H wire
Test condition Vehicle OFF (LOCK) mode Rear differential fluid pressure sensor 3P connector: disconnected AWD control unit 24P connector: disconnected CAN gateway 16P connector: disconnected Test point 1 AWD control unit 24P connector No. 14 Test point 2 CAN gateway 16P connector (female terminals) No. 6: F-CAN B L wire
Test condition Vehicle OFF (LOCK) mode Rear differential fluid pressure sensor 3P connector: disconnected AWD control unit 24P connector: disconnected CAN gateway 16P connector: disconnected Test point 1 AWD control unit 24P connector No. 24 Test point 2 CAN gateway 16P connector (female terminals) No. 14: Is there 1.0 Ω or less?
YES
The F-CAN B H and F-CAN B L wires is OK. Go to step 10.
NO
Repair an open in the F-CAN B H and/or F-CAN B L wires between the AWD control unit and the CAN gateway.
- Open wire check (DIAG-CAN H, DIAG-CAN L lines)
-1. Measure the resistance between test points 1 and 2 individually.
DIAG-CAN H wire
Test condition Vehicle OFF (LOCK) mode Rear differential fluid pressure sensor 3P connector: disconnected AWD control unit 24P connector: disconnected CAN gateway 16P connector: disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 2: Test point 2 Data link connector (16P) (female terminals) No. 6: DIAG-CAN L wire
Test condition Vehicle OFF (LOCK) mode Rear differential fluid pressure sensor 3P connector: disconnected AWD control unit 24P connector: disconnected CAN gateway 16P connector: disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 10: Test point 2 Data link connector (16P) (female terminals) No. 14: Is there 1.0 Ω or less?
YES
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good AWD control unit , and recheck. If the symptom/indication goes away with a known-good AWD control unit, replace the original AWD control unit .
NO
Repair an open in the F-CAN A H and/or F-CAN A L wires between the CAN gateway and the data link connector.