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Active Torque Control 4WD System (Diagnostic Codes & Circuit Tests): Diagnosis Lexus RX III

Transfer Case 7 illustrations ~1356 words

INSPECTION PROCEDURE

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

Scheme 128

Scheme 128: PROCEDURE
Scheme 128: PROCEDURE

Scheme 129

Scheme 129
Scheme 129
  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND BRAKE CONTROL SYSTEM) Check if the CAN communication system DTC is output. Refer to «DIAGNOSIS SYSTEM»(ref-400834-S42883997332011051800000) . Start the engine. Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more, and check if the speed sensor DTC (brake control system DTC) is output. Refer to «DTC CHECK / CLEAR»(ref-400653-S16813452302011051800000) . Result Result Proceed to Neither CAN communication system DTC nor speed sensor DTC (brake control system DTC) is output A CAN communication system DTC is output B Speed sensor DTC (brake control system DTC) is output C C --> See step 8 B --> See step 7 A: Go to next step
  2. INSPECT BATTERY Check the battery voltage. Standard Voltage 11 to 14 V NG --> INSPECT CHARGING SYSTEM OK: Go to next step
  3. CHECK WIRE HARNESS (4WD CONTROL ECU - BATTERY) Disconnect the ECU connector. Measure the voltage of the wire harness side connector. Standard Voltage Tester Connection Switch Condition Specified Condition O2-11 (IG1) - Body Ground Engine switch on (IG) 10 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to 4WD ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. CHECK WIRE HARNESS (4WD CONTROL ECU - BODY GROUND) Disconnect the ECU connector. Measure the resistance of the wire harness side connector. Standard Resistance Tester Connection Condition Specified Condition O2-23 (GND) - Body Ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to 4WD Control ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  5. RECONFIRM DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-400849-S17754683082011051800000) . Start the engine. Drive the vehicle, accelerate to a speed of 3 km/h (2 mph or more, and check if the same DTC is output. Result Result Proceed to DTC is output A DTC is not output B HINT: Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking DTCs. B --> CHECK INTERMITTENT PROBLEMS A --> See step 6
  6. REPLACE 4WD ECU ASSEMBLY. Refer to «REMOVAL»(ref-400819-S29410208432011051800000)
  7. REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (CAN COMMUNICATION SYSTEM). Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-400834-S03841674552011051800000)
  8. REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (BRAKE CONTROL SYSTEM). Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-400653-S24736953362011051800000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

Scheme 130

Scheme 130: PROCEDURE
Scheme 130: PROCEDURE

Scheme 131

Scheme 131
Scheme 131
  1. CHECK FOR DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-400849-S17754683082011051800000) . Turn the engine switch off. Turn the engine switch on (IG) again and check that no CAN communication system DTC(s) is output. Refer to «DIAGNOSIS SYSTEM»(ref-400834-S42883997332011051800000) . Start the engine. Drive the vehicle and turn the steering wheel to the right and left at a speed of 35 km/h (24 mph) and check that no brake control system (steering angle sensor) DTC (C1432,C1433 or C1434) is output. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-400653-S24736953362011051800000) . Result Result Proceed to Neither CAN communication system DTC nor brake control system DTC is output A CAN communication system DTC is output B Brake control system (steering angle sensor) DTC (C1432,C1433 or C1434) is output C HINT: When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor. C --> See step 5 B --> See step 4 A: Go to next step
  2. CHECK WIRE HARNESS (STEERING ANGLE SENSOR - BATTERY) Remove the steering wheel and the column cover lower. Make sure that there is no looseness at the locking part and the connecting part of the connectors. Disconnect the steering angle sensor connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F43-5 (IG) - Body ground Engine switch on (IG) 11 to 14 V F43-6 (BAT) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Steering Angle Sensor) NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step
  3. CHECK WIRE HARNESS (STEERING ANGLE SENSOR - BODY GROUND) Turn the engine switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F43-2 (ESS) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Steering Angle Sensor) NG --> REPAIR OR REPLACE HARNESS AND CONNECTOR OK --> See step 6
  4. REPAIR CIRCUIT INDICATOR OUTPUT CODE (CAN COMMUNICATION SYSTEM). Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-400834-S03841674552011051800000)
  5. REPAIR OR REPLACE CIRCUIT INDICATOR OUTPUT CODE (STEERING ANGLE SENSOR CIRCUIT). Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-400653-S24736953362011051800000)
  6. REPLACE SPIRAL CABLE (STEERING ANGLE SENSOR). Refer to «REMOVAL»(ref-400651-S34517911102011051800000)

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

Scheme 132

Scheme 132: PROCEDURE
Scheme 132: PROCEDURE

Scheme 133

Scheme 133
Scheme 133

Scheme 134

Scheme 134
Scheme 134
  1. CHECK WIRE HARNESS (4WD ECU - BATTERY) Disconnect the ECU connector. Measure the voltage of the wire harness side connector. Standard Voltage Tester Connection Condition Specified Condition O2-9 (BSLC) - Body Ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Rear view of wire harness connector (to 4WDl ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. INSPECT ELECTROMAGNETIC CONTROL COUPLING (4WD LINEAR SOLENOID) Remove the coupling connector. Measure the resistance of the solenoid. Standard Resistance Tester Connection Condition Specified Condition 1 (BSF) - 2 (SLC) Always 2.2 to 2.6 ohms 1 (BSF) - Body ground Always 10 kohms or higher 2 (SLC) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 4WD Linear Solenoid NG --> See step 5 OK: Go to next step
  3. CHECK WIRE HARNESS (ELECTROMAGNETIC CONTROL COUPLING - 4WD CONTROL ECU) Disconnect the ECU connector. Measure the resistance of the wire harness side connector. Standard Resistance Tester Connection Condition Specified Condition O2-13 (SLC+) - R5-1(BSF) Always Below 1 ohms O2-32 (SLC-) - R5-2 (SLC) Always Below 1 ohms O2-13 (SLC+) - Body ground Always 10 kohms or higher O2-32 (SLC-) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to 4WD Linear Solenoid) *2 Rear view of wire harness connector (to 4WD ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
  4. REPLACE 4WD ECU ASSEMBLY. Refer to «REMOVAL»(ref-400819-S29410208432011051800000)
  5. REPLACE ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY. Refer to «REMOVAL»(ref-400851-S03974864142011051800000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

HINT

Check the condition of each related circuit connector before troubleshooting. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

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