Active Torque Control 4WD System (Diagnostics - Introduction): Diagnosis Toyota RAV4 IV

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use these procedures to troubleshoot the active torque control 4WD system.
2. *: Use Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT BATTERY VOLTAGE Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. NEXT: Go to next step
3. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. RESULT Result Proceed to CAN DTC is not output A CAN DTC is output B B --> Go to CAN COMMUNICATION SYSTEM A: Go to next step
4. CHECK INDICATOR LIGHT NEXT: Go to next step
5. CHECK DTC* Check for DTCs.Refer to «DTC CHECK / CLEAR»(ref-493513-S00841236752012081000000) . Clear the DTCs. Recheck for DTCs. RESULT Result Proceed to DTC does not reoccur A DTC does reoccur B B --> GO TO STEP 8 A: Go to next step
6. PROBLEM SYMPTOMS TABLE RESULT Result Proceed to Fault not listed in problem symptoms table A Fault listed in problem symptoms table B B --> Go to step 8 A: Go to next step
7. OVERALL ANALYSIS AND TROUBLESHOOTING* Terminals of ECU.Refer to «TERMINALS OF ECU»(ref-493513-S37630852182012081000000) . Data List / Active Test.Refer to «DATA LIST / ACTIVE TEST»(ref-493513-S06398179592012081000000) . NEXT: Go to next step
8. REPAIR OR REPLACE NEXT: Go to next step
9. CONFIRMATION TEST NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

1. Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

ACTIVE TORQUE CONTROL 4WD SYSTEM

HINT

*:When driving 4WD mode, the vehicle is hard to turn, as if the brakes were applied, due to the rotational difference between the front and rear tires while turning.

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1. CHECK 4WD CONTROL ECU Measure the voltage and resistance of the connector. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition CANH (E57-14) - CANL (E57-16) P - W CAN communication Ignition switch off 54 to 69 ohms GND (E57-23) - Body ground W-B - Body ground Ground Always Below 1 ohms 4WDL (E57-7) - Body ground R - Body ground Ground 4WD lock mode switch ON Below 1 ohms IG1 (E57-11) - GND (E57-23) L - W-B Power source voltage Ignition switch ON 10 to 14 V SLC+ (E57-13) - SLC- (E57-32) W - B 4WD linear solenoid signal Ignition switch ON Pulse generation (See waveform 1) BSLC (E57-9) - GND (E57-23) R - W-B Power source voltage Ignition switch ON 10 to 14 V If the result is not as specified, the 4WD control ECU may have a malfunction. Using an oscilloscope, check the waveform 1. WAVEFORM 1 (REFERENCE) Symbols (Terminal No.) Content Tool setting 5 V/DIV., 2 msec. / DIV. Vehicle condition Engine stop, ignition switch ON

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1. DESCRIPTION Active torque control 4WD system data can be read in the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs. Therefore when there seems to be a problem with the active torque control 4WD, use the Techstream or SST to check and troubleshoot it. SST: 09843-18040
2. CHECK DLC3 The ECU uses CAN (ISO11898-1) and ISO9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO9141-2 format. Verify the conditions listed in the table below. Symbols (Terminal No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus + line During transmission Pulse generation CG (4) - Body Ground Chassis ground Always Below 1ohms SG (5) - Body Ground Signal ground Always Below 1ohms BAT (16) - Body Ground Battery positive Always 10 to 14 V CANH (6) - CANL (14) CAN bus line Ignition switch off* 54 to 69 ohms CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch off* 200 ohms or higher CANL (14) - CG (4) LOW-level CAN bus line Ignition switch off* 200 ohms or higher CANH (6) - BAT (16) HIGH-level CAN bus line Ignition switch off* 6 kohms or higher CANL (14) - BAT (16) LOW-level CAN bus line Ignition switch off* 6 kohms or higher NOTE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, other switches or the doors. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector. HINT: Connect the cable of the Techstream to the DLC3, turn the ignition switch ON and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
3. INDICATOR LIGHT When a problem occurs in the active torque control 4WD system, the 4WD indicator light on the combination meter comes ON to inform the driver of the problem.

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1. CHECK DTC (When Using Techstream) Check the DTCs. Connect the Techstream to the DLC3. Turn the ignition switch ON. Read the DTCs by following the prompts on the tester screen. HINT: Refer to the Techstream operator's manual for further details.
2. CLEAR DTC (When Using Techstream) Connect the Techstream to the DLC3. Turn the ignition switch ON. Operate the Techstream to clear the codes. HINT: Refer to the Techstream operator's manual for further details.
3. CHECK DTC (When not Using Techstream) Check the DTCs. Using the SST, connect terminals TC (13) and CG (4) of the DLC3 SST: 09843-18040 Turn the ignition switch ON. Read DTCs from the 4WD indicator light ON the combination meter. HINT: If the 4WD indicator light does not blink, perform relevant troubleshooting procedures. The relevant troubleshooting procedures are in the sections listed in the table below. If more than 1 DTC is detected at the same time, the DTCs will be displayed in numerical order. As an example, the blinking patterns of the normal system code and DTCs 11 and 21 are shown below. DTCs are explained in "DIAGNOSTIC TROUBLE CODE CHART".Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-493513-S05225390942012081000000) . Section Title See Procedure 4WD Indicator Light does not Come ON Refer to «4WD Indicator Light does not Come ON»(ref-493518-S01035676832012081000000) TC and CG Terminal Circuit Refer to «TC and CG Terminal Circuit»(ref-493518-S29573832372012081000000)
4. CLEAR DTC (When not Using Techstream) Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3. SST: 09843-18040 Turn the ignition switch ON. Clear the DTCs stored in the 4WD control ECU by depressing the brake pedal 8 times or more within 5 seconds. Check that the warning light blinks in the normal system code pattern. Remove SST from the terminals of the DLC3. Turn the ignition switch off. HINT: DTCs cannot be cleared by disconnecting the cable from the negative (-) battery terminal or removing the ECU-IG1 fuse.

DATA LIST / ACTIVE TEST

1. READ DATA LIST HINT: Using the Techstream Data List allows switch, sensor and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to save time. Connect the Techstream to the DLC3. Turn the ignition switch ON. Read the Data List according to the display on the tester. 4WD CONTROL ECU Tester Display Measurement Item/Range Normal Condition Diagnostic Note 4WD warning Light 4WD indicator light /OFF or ON OFF: 4WD indicator light OFF ON: 4WD indicator light ON - Slip Indicator Light Slip indicator light /OFF or ON OFF: SLIP indicator light OFF ON: SLIP indicator light ON - Stop lamp SW Stop light switch /OFF or ON OFF: Brake pedal released ON: Brake pedal depressed - Steering angle Value Steering angle value / Min.: -3276.8 ° Max.: 3276.7 ° Min.: -3276.8 ° Max.: 3276.7 ° - FR wheel Speed FR wheel speed / Min.: 0 km/h (0 mph) Reading : Max.: 326 km/h (202 mph) Actual wheel speed Almost no difference from the speedometer FL wheel Speed FL wheel speed / Min.: 0 km/h (0 mph) Reading : Max.: 326 km/h (202 mph) Actual wheel speed Almost no difference from the speedometer RR wheel Speed RR wheel speed / Min.: 0 km/h (0 mph) Reading : Max.: 326 km/h (202 mph) Actual wheel speed Almost no difference from the speedometer RL wheel Speed RL wheel speed / Min.: 0 km/h (0 mph) Reading : Max.: 326 km/h (202 mph) Actual wheel speed Almost no difference from the speedometer Ambient Temperature Ambient temperature / Min.: -128 °C (198.4 °F) Max.: 127 °C (260.6 °F) Min.: -128 °C (198.4 °F) Max.: 127 °C (260.6 °F) - Engine Coolant Temperature Engine coolant temperature / Min.: 0 °C (32 °F) Max.: 127.5 °C (261.5 °F) Min.: 0 °C (32 °F) Max.: 127.5 °C (261.5 °F) - 4WD Lock Switch 4WD lock switch / OFF or ON OFF: 4WD lock switch off ON: 4WD lock switch on - SLC Solenoid Current SLC solenoid (4WD linear solenoid) current / Min.: 0.00 A Max.: 3.00 A Min.: 0.00 A Max.: 3.00 A
2. PERFORM ACTIVE TEST HINT: Performing the Techstream Active Test allows switch and other items to be operated without removing any parts. Performing the Active Test early in troubleshooting is one way to save time. The Data List can be displayed during the Active Test. Connect the Techstream to the DLC3. Turn the ignition switch ON. Perform the Active Test according to the display on the tester. COMBINATION METER Tester Display Test Part Control Range Diagnostic Note 4WD warning Indicator 4WD indicator light Indicator light is ON / OFF Observe combination meter Indicat. 4WD Lock 4WD lock indicator light Indicator light is ON / OFF Observe combination meter

DIAGNOSTIC TROUBLE CODE CHART