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Contents Wiring diagrams Section: Transfer Case All sections

Four Wheel Drive Control System (Diagnostic Codes & Symptom Tests): Other Lexus IS III

Transfer Case 3 illustrations ~4323 words

PROCEDURE

  1. CHECK DTC OUTPUT Connect the Techstream to the DLC3. Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Trouble Codes Record the output DTC (4WD control system). HINT: When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor or ECU. Result Proceed to NEXT Result: 1 NEXT GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000)

CAUTION / NOTICE / HINT

HINT

Check the condition of each related circuit connector before troubleshooting.

Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [04/2013 - ]

  1. CHECK TIRE CONDITION Check the size and condition of all 4 tires. Refer to «INSPECTION [04/2013 - ]»(ref-665812-S08644795652014102400000) HINT: This DTC is output when tire deformation or a difference in tire size is detected. OK The diameter and air pressure of all 4 tires are the same. Result Proceed to OK NG Result: 2 NG REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME IN SIZE Result: 1 OK See step 2
  2. CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM) Connect the Techstream to the DLC3. Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Clear DTCs Start the engine. Drive the vehicle at a speed of 20 km/h (12 mph) or more and check that no brake control system DTCs are output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Trouble Codes Result Result Proceed to Brake control system DTCs are not output. A Brake control system DTCs are output. B Result: 2 B REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (BRAKE CONTROL SYSTEM). Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665532-S42482876212014102400000) Result: 1 A See step 3
  3. READ VALUE USING TECHSTREAM (WHEEL SPEED) Connect the Techstream to the DLC3. Start the engine. Enter the following menus: Chassis / Four Wheel Drive / Data List Check that the speed values detected at all four wheels displayed on the Techstream are the same when driving the vehicle. Chassis > Four Wheel Drive > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note FR Wheel Speed Front wheel speed sensor RH reading min.: 0 km/h (0 mph) max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. FL Wheel Speed Front wheel speed sensor LH reading min.: 0 km/h (0 mph) max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. RR Wheel Speed Rear wheel speed sensor RH reading min.: 0 km/h (0 mph) max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. RL Wheel Speed Rear wheel speed sensor LH reading min.: 0 km/h (0 mph) max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. Chassis > Four Wheel Drive > Data List Tester Display FR Wheel Speed FL Wheel Speed RR Wheel Speed RL Wheel Speed OK The same vehicle speed is detected at all four wheels. Result Proceed to OK NG Result: 2 NG GO TO BRAKE CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665532-S11298464042014102400000) Result: 1 OK See step 4
  4. CHECK RELATED PART Inspect the suspension and ball joints for looseness. OK There is no looseness in the suspension and ball joints. Inspect the driveshaft and propeller shaft rotation condition. OK The drive shaft and propeller shaft rotate smoothly. Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE MALFUNCTIONING PARTS Result: 1 OK See step 5
  5. RECONFIRM DTC OUTPUT Connect the Techstream to the DLC3. Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Clear DTCs Start the engine. Drive the vehicle, accelerating to a speed of 20 km/h (12 mph) or more and check if the same DTC is output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Trouble Codes Result Result Proceed to DTC is output. A DTC is not output. B Result: 2 B CHECK INTERMITTENT PROBLEMS. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 1 A See step 6
  6. REPLACE 4WD ECU ASSEMBLY Replace the 4WD ECU assembly. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000) NOTE: When the 4WD ECU assembly is replaced with a new one, it is not necessary to perform initialization. Refer to «INITIALIZATION [04/2013 - ]»(ref-665560-S07569788152014102400000) Result Proceed to NEXT Result: 1 NEXT See step 7
  7. RECONFIRM DTC OUTPUT Connect the Techstream to the DLC3. Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Clear DTCs Start the engine. Drive the vehicle, accelerating to a speed of 20 km/h (12 mph) or more and check if the same DTC is output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Trouble Codes Result Result Proceed to DTCs are output. A DTCs are not output. B Result: 1 A REPLACE AUTOMATIC TRANSMISSION WITH TRANSFER ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665725-S30982289102014102400000) Result: 2 B CHECK INTERMITTENT PROBLEMS. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000)

HINT

Check the condition of each related circuit connector before troubleshooting.

Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [04/2013 - ]

Scheme 84

Scheme 84: PROCEDURE
Scheme 84: PROCEDURE
  1. INSPECT TRANSFER TRANSMISSION WIRE (TRANSFER CONTROL SOLENOID ASSEMBLY) Disconnect the F49 transfer transmission wire connector. *a Component without harness connected (Transfer Transmission Wire) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F49-1 (BSF) - F49-3 (SLC) 20°C (68°F) 5.0 to 5.6 ohms F49-1 (BSF) - Body ground Always 10 kohms or higher F49-3 (SLC) - Body ground Always 10 kohms or higher Result Proceed to OK NG Result: 2 NG See step 3 Result: 1 OK See step 2
  2. CHECK HARNESS AND CONNECTOR (TRANSFER TRANSMISSION WIRE - 4WD ECU ASSEMBLY) Disconnect the A58 4WD ECU assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A58-2 (SLC+) - F49-1 (BSF) Always Below 1 ohms A58-1 (SLC-) - F49-3 (SLC) Always Below 1 ohms A58-2 (SLC+) - Body ground Always 10 kohms or higher A58-1 (SLC-) - Body ground Always 10 kohms or higher F49-1 (BSF) - Body ground Always 10 kohms or higher F49-3 (SLC) - Body ground Always 10 kohms or higher Result Proceed to OK NG Result: 1 OK REPLACE 4WD ECU ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000) Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR (SLC+, SLC- CIRCUIT)
  3. INSPECT TRANSFER CONTROL SOLENOID ASSEMBLY Remove the transfer control solenoid assembly. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S31323274992014102400000) Inspect the transfer control solenoid assembly. Refer to «INSPECTION [04/2013 - ]»(ref-665804-S41189013702014102400000) Result Proceed to OK NG Result: 1 OK REPLACE TRANSFER TRANSMISSION WIRE. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S39002532162014102400000) Result: 2 NG REPLACE TRANSFER CONTROL SOLENOID ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S41387162042014102400000)

HINT

Check the condition of each related circuit connector before troubleshooting.

Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [04/2013 - ]

  1. CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM) Connect the Techstream to the DLC3. Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > ABS/VSC/TRAC > Clear DTCs Turn the engine switch on (IG) and check that no CAN communication system DTCs are output. Refer to «DIAGNOSIS SYSTEM [04/2013 - ]»(ref-665810-S14264089842014102400000) Start the engine. Drive the vehicle and turn the steering wheel to the right and left at a speed of 35 km/h (22 mph) and check that no brake control system (steering sensor) DTCs (C1432, C1433 or C1434) are output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) HINT: When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor or ECU. Chassis > ABS/VSC/TRAC > Trouble Codes Result Result Proceed to Neither CAN communication system DTCs nor brake control system DTCs are output A CAN communication system DTCs are output B Brake control system (steering sensor) DTCs (C1432, C1433 or C1434) are output C Result: 2 B GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) Result: 3 C REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (BRAKE CONTROL SYSTEM). Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665532-S42482876212014102400000) Result: 1 A See step 2
  2. READ VALUE USING TECHSTREAM (STEERING ANGLE VALUE) Connect the Techstream to the DLC3. Start the engine. Enter the following menus: Chassis / Four Wheel Drive / Data List Check that the steering sensor value changes in accordance with the steering wheel movement. Chassis > Four Wheel Drive > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Steering Angle Value Steering angle value min.: -3276.8° max.: 3276.7° Left turn: Increases Right turn: Decreases Changes in proportion with the amount of steering wheel rotation during steering operation. OK The steering sensor value changes in accordance with the steering wheel movement. Result Proceed to OK NG Result: 1 OK REPLACE 4WD ECU ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000) Result: 2 NG REPLACE STEERING SENSOR. Refer to «COMPONENTS [04/2013 - ]»(ref-665739-S08647932662014102400000)

HINT

Check the condition of each related circuit connector before troubleshooting.

Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [04/2013 - ]

  1. CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM) Connect the Techstream to the DLC3. Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Clear DTCs Start the engine. Drive the vehicle, accelerating to a speed of 20 km/h (12 mph) or more and check if the speed sensor DTC (brake control system DTC) is output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Trouble Codes Result Result Proceed to No speed sensor DTCs (brake control system DTC) are output A Speed sensor DTCs (brake control system DTC) are output B Result: 2 B REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (BRAKE CONTROL SYSTEM). Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665532-S42482876212014102400000) Result: 1 A See step 2
  2. READ VALUE USING TECHSTREAM (WHEEL SPEED) Connect the Techstream to the DLC3. Start the engine. Enter the following menus: Chassis / Four Wheel Drive / Data List Check that the speed values detected at all four wheels displayed on the Techstream are the same when driving the vehicle. Chassis > Four Wheel Drive > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note FR Wheel Speed Front wheel speed sensor RH reading min.: 0 km/h (0 mph) max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. FL Wheel Speed Front wheel speed sensor LH reading min.: 0 km/h (0 mph) max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. RR Wheel Speed Rear wheel speed sensor RH reading min.: 0 km/h (0 mph) max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. RL Wheel Speed Rear wheel speed sensor LH reading min.: 0 km/h (0 mph) max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. Chassis > Four Wheel Drive > Data List Tester Display FR Wheel Speed FL Wheel Speed RR Wheel Speed RL Wheel Speed OK The same vehicle speed is detected at all four wheels. Result Proceed to OK NG Result: 2 NG GO TO BRAKE CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665532-S11298464042014102400000) Result: 1 OK See step 3
  3. RECONFIRM DTC OUTPUT Connect the Techstream to the DLC3. Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Clear DTCs Start the engine. Drive the vehicle, accelerating to a speed of 20 km/h (12 mph) or more and check if the same DTC is output. Chassis > Four Wheel Drive > Trouble Codes Result Result Proceed to DTC is output A DTC is not output B Result: 1 A REPLACE 4WD ECU ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000) Result: 2 B CHECK INTERMITTENT PROBLEMS. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000)

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 [04/2013 - ]

Scheme 85

Scheme 85: PROCEDURE
Scheme 85: PROCEDURE
  1. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) Disconnect the A58 4WD ECU assembly connector. *a Front view of wire harness connector (to 4WD ECU Assembly) Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A58-3 (IG1) - Body ground Engine switch on (IG) 11 to 14 V Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) Result: 1 OK See step 2
  2. CHECK HARNESS AND CONNECTOR (GND TERMINAL) Turn the engine switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A58-4 (GND) - Body ground Always Below 1 ohms *a Front view of wire harness connector (to 4WD ECU Assembly) Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) Result: 1 OK See step 3
  3. RECONFIRM DTC OUTPUT Connect the Techstream to the DLC3. Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Clear DTCs Turn the engine switch on (IG). Check that no DTCs other than DTC C120C/79 have been output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Trouble Codes Result Result Proceed to DTCs other than C120C/79 are not output. A DTCs other than C120C/79 are output. B Result: 1 A REPLACE 4WD ECU ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000) Result: 2 B REPAIR CIRCUIT INDICATED BY OUTPUT CODE. Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665560-S20936710382014102400000)

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 [04/2013 - ]

  1. CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM) Connect the Techstream to the DLC3. Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > ABS/VSC/TRAC > Clear DTCs Turn the engine switch on (IG) and check that no CAN communication system DTCs are output. Refer to «DIAGNOSIS SYSTEM [04/2013 - ]»(ref-665810-S14264089842014102400000) Start the engine. Drive the vehicle, accelerating to a speed of 3 km/h (2 mph) or more and check that no speed sensor DTC (brake control system DTC) is output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Trouble Codes 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 Result: 2 B GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) Result: 3 C REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (BRAKE CONTROL SYSTEM). Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665532-S42482876212014102400000) Result: 1 A See step 2
  2. INSPECT BATTERY Check the battery voltage. Standard Voltage 11 to 14 V Result Proceed to OK NG Result: 2 NG INSPECT CHARGING SYSTEM for 2GR-FSE: Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(ref-665710-S19859479582014102400000) for 4GR-FSE: Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(ref-665711-S19112603242014102400000) Result: 1 OK See step 3
  3. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) Disconnect the A58 4WD ECU assembly connector. *a Front view of wire harness connector (to 4WD ECU Assembly) Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A58-3 (IG1) - Body ground Engine switch on (IG) 11 to 14 V Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) Result: 1 OK See step 4
  4. CHECK HARNESS AND CONNECTOR (GND TERMINAL) Turn the engine switch off. *a Front view of wire harness connector (to 4WD ECU Assembly) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A58-4 (GND) - Body ground Always Below 1 ohms Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) Result: 1 OK See step 5
  5. RECONFIRM DTC OUTPUT Connect the Techstream to the DLC3. Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Clear DTCs Start the engine. Drive the vehicle, accelerating to a speed of 3 km/h (2 mph) or more and check if the same DTC is output. HINT: Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking DTCs. Chassis > Four Wheel Drive > Trouble Codes Result Result Proceed to DTC is output. A DTC is not output. B Result: 1 A REPLACE 4WD ECU ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000) Result: 2 B CHECK INTERMITTENT PROBLEMS. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000)

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

HINT

  1. When DTC C1297/97, U0100/85 or U0126/84 is detected, the AWD warning message is not displayed.
  2. Check the condition of each related circuit connector before troubleshooting. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE [04/2013 - ]»(ref-665529-S31239628642014102400000)
  1. CHECK DTC OUTPUT Connect the Techstream to the DLC3. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Trouble Codes Check if CAN communication system DTCs are output. Refer to «DIAGNOSIS SYSTEM [04/2013 - ]»(ref-665810-S14264089842014102400000) HINT: When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor. Result Result Proceed to Neither CAN communication system DTC nor AWD control system DTC is output. A CAN communication DTCs are output. B AWD control system DTCs are output. C Result: 2 B GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) Result: 3 C REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (FOUR WHEEL DRIVE CONTROL SYSTEM). Refer to «DIAGNOSTIC TROUBLE CODE CHART [04/2013 - ]»(ref-665560-S20936710382014102400000) Result: 1 A See step 2
  2. INSPECT BATTERY Check the battery voltage. Standard Voltage 11 to 14 V Result Proceed to OK NG Result: 2 NG INSPECT CHARGING SYSTEM for 2GR-FSE: Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(ref-665710-S19859479582014102400000) for 4GR-FSE: Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(ref-665711-S19112603242014102400000) Result: 1 OK See step 3
  3. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) Disconnect the A58 4WD ECU assembly connector. *a Front view of wire harness connector (to 4WD ECU Assembly) Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A58-3 (IG1) - Body ground Engine switch on (IG) 11 to 14 V Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) Result: 1 OK See step 4
  4. CHECK HARNESS AND CONNECTOR (GND TERMINAL) Turn the engine switch off. *a Front view of wire harness connector (to 4WD ECU Assembly) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A58-4 (GND) - Body ground Always Below 1 ohms Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) Result: 1 OK See step 5
  5. READ VALUE USING TECHSTREAM (4WD WARNING LIGHT) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / Four Wheel Drive / Data List. According to the display on the Techstream, read the Data List. Chassis > Four Wheel Drive > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note 4WD Warning Light AWD warning (multi-information display) ON/OFF ON: Warning on OFF: Warning off - Chassis > Four Wheel Drive > Data List Tester Display 4WD Warning Light Result Result Proceed to Display of the Data List remains OFF A Display of the Data List remains ON B Result: 1 A GO TO METER/GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665542-S15097588262014102400000) Result: 2 B REPLACE 4WD ECU ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000)

HINT

  1. When DTC C1297/97, U0100/85, or U0126/84 is detected, the AWD warning message is not displayed.
  2. Check the condition of each related circuit connector before troubleshooting. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE [04/2013 - ]»(ref-665529-S31239628642014102400000)
  1. CHECK DTC OUTPUT Check if CAN communication system DTCs are output. Refer to «DIAGNOSIS SYSTEM [04/2013 - ]»(ref-665810-S14264089842014102400000) HINT: When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor. Chassis > Four Wheel Drive > Trouble Codes Result Result Proceed to CAN communication system DTCs are not output A CAN communication system DTCs are output B Result: 2 B GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) Result: 1 A See step 2
  2. INSPECT AWD WARNING Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / Four Wheel Drive / Active Test Chassis > Four Wheel Drive > Active Test Tester Display Measurement Item Control Range Diagnostic Note 4WD Warning Light AWD warning (multi-information display) Warning ON/OFF Observe the multi-information display. When performing the 4WD Warning Light Active Test, check 4WD Warning Light in the Data List. Chassis > Four Wheel Drive > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note 4WD Warning Light AWD warning (multi-information display) ON or OFF ON: Warning on OFF: Warning off - Result Result Proceed to Does not change between ON and OFF A Changes between ON and OFF B Result: 1 A REPLACE 4WD ECU ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000) Result: 2 B GO TO METER/GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665542-S15097588262014102400000)

HINT

  1. When multiple warning lights in the combination meter blink continuously, a ground short in the wiring or an ECU connected to terminal TC of the DLC3 is suspected.
  2. A DTC output mode signal is transmitted via the CAN communication system to each ECU including the 4WD ECU assembly. Thus when multiple systems do not enter DTC output mode, there may be an ECM malfunction.

Scheme 86

Scheme 86: PROCEDURE
Scheme 86: PROCEDURE
  1. CHECK CAN COMMUNICATION SYSTEM Check if CAN communication system DTCs are output. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) HINT: When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor. Chassis > Four Wheel Drive > Trouble Codes Result Result Proceed to CAN communication system DTCs are not output A CAN communication system DTCs are output B Result: 2 B GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) Result: 1 A See step 2
  2. INSPECT DLC3 (TC TERMINAL VOLTAGE) Turn the engine switch on (IG). *a Front view of DLC3 Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition K9-13 (TC) - K9-4 (CG) Engine switch on (IG) 11 to 14 V Result Proceed to OK NG Result: 1 NG See step 4 Result: 2 OK See step 3
  3. REPLACE ECM Replace the ECM. *a Front view of DLC3 for 2GR-FSE: Refer to «COMPONENTS [04/2013 - ]»(ref-665726-S40360072022014102400000) for 4GR-FSE: Refer to «COMPONENTS [04/2013 - ]»(ref-665751-S42872120402014102400000) Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3. SST: 09843-18040 Turn the engine switch on (IG). Check that the "DIAG AWD FF" or "DIAG AWD XX (DTC)" is displayed. Result Result Proceed to "DIAG AWD FF" or "DIAG AWD XX (DTC)" is displayed A "DIAG AWD FF" and "DIAG AWD XX (DTC)" are not displayed B Result: 1 A END Result: 2 B REPLACE 4WD ECU ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000)
  4. CHECK HARNESS AND CONNECTOR (ECM - DLC3) Disconnect the A77 ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A77-21 (TC) - K9-13 (TC) Always Below 1 ohms K9-13 (TC) - Body ground Always 10 kohms or higher Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR (TC TERMINAL CIRCUIT) Result: 1 OK See step 5
  5. CHECK HARNESS AND CONNECTOR (CG OF DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition K9-4 (CG) - Body ground Always Below 1 ohms *a Front view of DLC3 Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR Result: 1 OK See step 6
  6. REPLACE ECM Replace the ECM. *a Front view of DLC3 for 2GR-FSE: Refer to «COMPONENTS [04/2013 - ]»(ref-665726-S40360072022014102400000) for 4GR-FSE: Refer to «COMPONENTS [04/2013 - ]»(ref-665751-S42872120402014102400000) Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3. SST: 09843-18040 Turn the engine switch on (IG). Check that the "DIAG AWD FF" or "DIAG AWD XX (DTC)" is displayed. Result Result Proceed to "DIAG AWD FF" or "DIAG AWD XX (DTC)" is displayed A "DIAG AWD FF" and "DIAG AWD XX (DTC)" are not displayed B Result: 1 A END Result: 2 B REPLACE 4WD ECU ASSEMBLY. Refer to «COMPONENTS [04/2013 - ]»(ref-665804-S32195237752014102400000)

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