Vehicle Stability Control System (Diagnostics - Introduction): Other Scion FR-S I

PRECAUTION [07/2013 - 12/2013]

1. TROUBLESHOOTING PRECAUTIONS When there is a malfunction with terminal contact points or part installation problems, removal and installation of the suspected parts may return the system to normal either completely or temporarily. In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as DTC output and the Freeze Frame Data, and record it before disconnecting any connector or removing and installing parts. Since the system may be influenced by malfunctions in systems other than the VSC system, be sure to check for DTCs in other systems.
2. HANDLING PRECAUTIONS Do not remove or install VSC parts such as the steering sensor except when required, as they need to be adjusted correctly after removal and installation. Be sure to perform preparation before work and confirmation after work is completed by following the directions in the repair manual when working on the VSC system. Be sure to remove and install the ECU, brake actuator assembly, sensors, etc. with the ignition switch off unless it is otherwise specified in the inspection procedure. If the ECU, brake actuator assembly or a sensor has been removed and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using the Techstream, also check that system functions and signals received by the ECU are normal using Test Mode.
3. DTC PRECAUTION Warnings for some DTCs cannot be cleared only by repairing the malfunctioning parts. If the warning is displayed after repair work, the DTC should be cleared after turning the ignition switch off. NOTE: If a DTC for a malfunctioning part reappears after it was cleared, then it has been stored again.
4. CHASSIS DYNAMOMETER PRECAUTION When testing with a 2-wheel drum tester such as a speedometer tester, a combination tester for the speedometer and brakes, a chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter Inspection Mode and stop the TR(A)C and VSC systems. Enter Inspection Mode to disable TR(A)C and VSC operation when using a chassis dynamometer. HINT: If Inspection Mode is not used, the vehicle may unexpectedly move off the dynamometer because of TR(A)C and VSC operation. The VSC OFF switch must not be used to disable TR(A)C and VSC operation when the vehicle is to be operated on a dynamometer. Pressing the VSC OFF switch does not disable TR(A)C and VSC operation completely. NOTE: Secure the vehicle with lock chains for safety. Activating Inspection Mode (When Using the Techstream) Ensure that the ignition switch is off and the engine is stopped. Make sure that the shift lever is in P. Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Inspection Mode. Check that the VSC OFF indicator light will come on. HINT: If the VSC OFF indicator light does not come on, repeat the steps. Turning the ignition switch off ends Inspection Mode. Activating Inspection Mode (When not Using the Techstream) HINT: Perform steps "C" to "H" within 30 seconds. Ensure that the ignition switch is off and the engine is stopped (Step "A"). for Manual Transmission: Check that the shift lever is in neutral (Step "B"). for Automatic Transmission: Make sure that the shift lever is in P (Step "B"). Start the engine (Step "C"). Apply the parking brake by pulling up the parking brake lever (Step "D"). Depress and release the brake pedal twice (Step "E"). While holding the brake pedal down, release and apply the parking brake twice (Step "F"). With the parking brake applied, depress and release the brake pedal twice (Step "G"). Check if the slip indicator light will come on (Step "H"). HINT: If the slip indicator light does not come on in step "H", repeat steps "A" to "H". Turning the ignition switch off ends Inspection Mode.
5. CAN COMMUNICATION SYSTEM PRECAUTIONS The CAN communication system is used for communication between the skid control ECU (brake actuator assembly), the steering sensor and other ECUs. If any CAN communication DTCs are detected, DTCs corresponding to the malfunction will be output. If any CAN communication DTCs are output, repair the malfunction and troubleshoot the VSC system while communication is normal. In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires that have an equal length. A bypass wire should not be used because the data being transmitted will be corrupted.

PRECAUTION [12/2013 - ]

1. IGNITION SWITCH EXPRESSIONS The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ignition Switch (Position) Engine Switch (Condition) Ignition Switch off LOCK Off (Lock) Ignition Switch ACC ACC On (ACC) Ignition Switch ON ON On (IG) Engine Start START On (Start)
2. TROUBLESHOOTING PRECAUTIONS When there is a malfunction with terminal contact points or part installation problems, removal and installation of the suspected parts may return the system to normal either completely or temporarily. In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as DTC output and the Freeze Frame Data, and record it before disconnecting any connector or removing and installing parts. Since the system may be influenced by malfunctions in systems other than the VSC system, be sure to check for DTCs in other systems.
3. HANDLING PRECAUTIONS Do not remove or install VSC parts such as the steering sensor except when required, as they need to be adjusted correctly after removal and installation. Be sure to perform preparation before work and confirmation after work is completed by following the directions in the repair manual when working on the VSC system. Be sure to remove and install the ECU, brake actuator assembly, sensors, etc. with the ignition switch off unless it is otherwise specified in the inspection procedure. If the ECU, brake actuator assembly or a sensor has been removed and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using the Techstream, also check that system functions and signals received by the ECU are normal using Test Mode.
4. DTC PRECAUTION Warnings for some DTCs cannot be cleared only by repairing the malfunctioning parts. If the warning is displayed after repair work, the DTC should be cleared after turning the ignition switch off. NOTE: If a DTC for a malfunctioning part reappears after it was cleared, then it has been stored again.
5. CHASSIS DYNAMOMETER PRECAUTION When testing with a 2-wheel drum tester such as a speedometer tester, a combination tester for the speedometer and brakes, a chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter Inspection Mode and stop the TR(A)C and VSC systems. Enter Inspection Mode to disable TR(A)C and VSC operation when using a chassis dynamometer. HINT: If Inspection Mode is not used, the vehicle may unexpectedly move off the dynamometer because of TR(A)C and VSC operation. The VSC OFF switch must not be used to disable TR(A)C and VSC operation when the vehicle is to be operated on a dynamometer. Pressing the VSC OFF switch does not disable TR(A)C and VSC operation completely. NOTE: Secure the vehicle with lock chains for safety. Activating Inspection Mode (When Using the Techstream) Ensure that the ignition switch is off and the engine is stopped. Make sure that the shift lever is in P. Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Inspection Mode. Check that the VSC OFF indicator light will come on. HINT: If the VSC OFF indicator light does not come on, repeat the steps. Turning the ignition switch off ends Inspection Mode. Activating Inspection Mode (When not Using the Techstream) HINT: Perform steps "C" to "H" within 30 seconds. Ensure that the ignition switch is off and the engine is stopped (Step "A"). for Manual Transmission: Check that the shift lever is in neutral (Step "B"). for Automatic Transmission: Make sure that the shift lever is in P (Step "B"). Start the engine (Step "C"). Apply the parking brake by pulling up the parking brake lever (Step "D"). Depress and release the brake pedal twice (Step "E"). While holding the brake pedal down, release and apply the parking brake twice (Step "F"). With the parking brake applied, depress and release the brake pedal twice (Step "G"). Check if the slip indicator light will come on (Step "H"). HINT: If the slip indicator light does not come on in step "H", repeat steps "A" to "H". Turning the ignition switch off ends Inspection Mode.
6. CAN COMMUNICATION SYSTEM PRECAUTIONS The CAN communication system is used for communication between the skid control ECU (brake actuator assembly), the steering sensor and other ECUs. If any CAN communication DTCs are detected, DTCs corresponding to the malfunction will be output. If any CAN communication DTCs are output, repair the malfunction and troubleshoot the VSC system while communication is normal. In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires that have an equal length. A bypass wire should not be used because the data being transmitted will be corrupted.

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

*: for Automatic Transmission

CHECK FOR INTERMITTENT PROBLEMS [07/2013 - ]

1. CHECK FOR INTERMITTENT PROBLEMS HINT: A momentary interruption (open circuit) in the connectors and/or wire harness can be detected using the Data List function of the Techstream. Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Follow the directions on the Techstream to display the Data List and select areas where momentary interruption should be monitored. HINT: A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch is turned to ON (initial check). If Error remains displayed for one of the items on the Techstream, check for continuity between the ECU and the item for which Error is displayed. If a momentary interruption occurs and Error is displayed on the Techstream, Error will remain displayed on the Techstream for 1 second after the circuit returns to normal. ABS/VSC/TRAC Tester Display Measurement Item/Range Normal Condition Diagnostic Note IG Voltage Value Decreased IG voltage value decrease detection / Error or Normal Error: Voltage low Normal: Normal - IG Voltage Value Increased IG voltage value increase detection / Error or Normal Error: Voltage high Normal: Normal - While observing the screen, gently jiggle the connector or wire harness. OK Normal is displayed. HINT: If the display changes, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.

FREEZE FRAME DATA [07/2013 - ]

1. FREEZE FRAME DATA Whenever an ABS DTC is detected, the skid control ECU stores the current vehicle (ECU or sensor) state as Freeze Frame Data. The skid control ECU stores the number of times (maximum: 31) the ignition switch has been turned from off to ON since the last time the ABS was activated. HINT: However, if the vehicle is stopped or driven at a low speed (7 km/h (4.3 mph) or less), or if a DTC is detected, the skid control ECU will stop counting the number. Freeze Frame Data at the time the ABS operates: The skid control ECU stores and updates data whenever the ABS system operates. When the ECU stores data at the time a DTC is detected, the data stored during ABS operation is cleared. Freeze Frame Data at the time a DTC is detected: When the skid control ECU stores data at the time a DTC is detected, no updates will be performed until the data is cleared.
2. CHECK FREEZE FRAME DATA Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Chassis / ABS/VSC/ TRAC / Trouble Codes. Select a DTC to display its Freeze Frame Data. ABS/VSC/TRAC Tester Display Measurement Item/Range Normal Condition Diagnostic Note Elapsed Time after Freeze Trigger Elapsed time after freeze trigger / Min.: 0 msec, Max.: 510 msec - - Number of IG ON Number of times ignition switch turned to ON after Freeze Frame Data stored / 0 to 31 - - Stop Light SW Stop light switch / ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - Parking Brake SW Parking brake switch / ON or OFF ON: Parking brake applied OFF: Parking brake released - Gear Position* Gear position information / "P, N", R, 1st-6th or Fail Actual gear position - Shift Lever Position* Shift lever position information / "P, N", R, D/M or Fail Actual shift lever position - Operated System Operated system status / ABS, VSC, TRC(TRAC), BA or Fail Actual operated system ABS: ABS activated VSC: VSC activated TRC(TRAC): TR(A)C activated BA: BA activated Fail: Fail safe mode activated Master Cylinder Sensor Master cylinder pressure sensor reading / Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.20 to 0.40 V Reading increases when brake pedal is depressed M/C Sensor Grade Master cylinder pressure sensor change / Min.: -30 MPa/s, Max.: 225 MPa/s When brake pedal is released or pedal held at constant position: 0 MPa/s When brake pedal is being operated: Changes in proportion with pedal movement speed Yaw Rate Sensor Yaw rate sensor / Min.: -128 °/s, Max.: 127 °/s Vehicle stopped: 0 °/s Turning right: -128 to 0 °/s Turning left: 0 to 127 °/s - Lateral G Lateral G / Min.: -25.10 m/s 2 , Max.: 24.90 m/s 2 - During turning: Changes in proportion with acceleration Forward and Rearward G Forward and backward G / Min.: - 25.10 m/s 2 , Max.: 24.90 m/s 2 - During acceleration/deceleration: Changes in proportion with acceleration FR Wheel Speed Front wheel speed sensor RH reading / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations FL Wheel Speed Front wheel speed sensor LH reading / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations RR Wheel Speed Rear wheel speed sensor RH reading / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations RL Wheel Speed Rear wheel speed sensor LH reading / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations Vehicle Speed Maximum wheel speed sensor reading / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations Vehicle Speed Grade Vehicle speed grade / Min.: -25.10 m/s 2 , Max.: 24.90 m/s 2 Vehicle stopped: 0 m/s 2 During driving: Changes in proportion with vehicle acceleration/deceleration Real Engine Torque Real engine torque / Min.: -1024.0 Nm, Max.: 1023.0 Nm - - Accelerator Opening Angle % The difference of a present accelerator / Min.: 0.0%, Max.: 100.0% When the accelerator pedal is released: 0.0% During accelerator pedal operation: Changes in proportion with the pedal movement Inspection Mode Inspection mode / Other or Inspect Other: Normal mode Inspect: Inspection mode - Steering Angle Sensor Steering angle sensor / Min.: - 3276.8°, Max.: 3276.7° Turning left: Increases Turning right: Decreases - TRC(TRAC)/VSC Off Mode TR(A)C/VSC OFF mode / Normal, TRC(TRAC) OFF or VSC OFF Normal: Normal mode TRC(TRAC) OFF: TR(A)C OFF mode VSC OFF: VSC OFF mode - Sports Mode VSC SPORT mode / Normal or Sports Normal: Normal mode Sports: VSC SPORT mode - *: for Automatic Transmission
3. CLEAR FREEZE FRAME DATA NOTE: Clearing the DTC will also clear the Freeze Frame Data. Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Clear the DTCs and Freeze Frame Data. Refer to DTC CHECK / CLEAR [07/2013 - ] .

FAIL-SAFE CHART [07/2013 - ]

1. FAIL-SAFE OPERATION If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power supply to the brake actuator assembly and informs the ECM of VSC system malfunction. The brake actuator turns off the solenoids and the ECM stops its VSC control according to signals from the skid control ECU. The vehicle will operate in a manner similar to a vehicle that is not equipped with ABS, TR(A)C and VSC systems. ABS control will be prohibited, but EBD control will continue to the extent that EBD control is possible. If EBD control is impossible, the brake warning light will come on to warn the driver. Refer to DIAGNOSIS SYSTEM [07/2013 - ] . If a VSC system component malfunctions before VSC control begins, VSC control will be prohibited. If a system component malfunctions during VSC control, the system will gradually stop performing control so as not to trigger a sudden change in vehicle operation. If it is impossible for control to continue, the indicator light comes on to inform the driver of system control termination. Refer to DIAGNOSIS SYSTEM [07/2013 - ] . ABS, EBD AND BA SYSTEM Item Operation Malfunction in the ABS system. ABS, BA, TR(A)C and VSC control prohibited. Malfunction in the BA system. ABS, BA, TR(A)C and VSC control prohibited. Malfunction in the EBD system. ABS, EBD, BA, TR(A)C and VSC control prohibited. TR(A)C AND VSC SYSTEM Item Operation Malfunction in the engine control system (TR(A)C and VSC systems). Before control: Disables control. During control: Uses only the brakes to perform control. Malfunction in the automatic transmission control system (TR(A)C and VSC systems). Disables control. Malfunction in the brake control system (VSC system). Disables control. Malfunction in the brake control system (TR(A)C system). Before control: Disables control. During control: Disables control (by gradually ending control).