ABS Warning Lamp module
The active ABS warning lamp module indicates the self-test and failure status of the ABS. The ABS warning lamp shall be on
- During the initialization phase after IGN ON. (continuously 3 seconds).
- In the event of inhibition of ABS functions by failure.
- During diagnostic mode.
- When the ECU Connector is separated from ECU.
- Cluster lamp is ON when communication is impossible with CAN module.
EBD/Parking Brake Warning Lamp Module
The active EBD warning lamp module indicates the self-test and failure status of the EBD. However, in case the Parking Brake Switch is turned on, the EBD warning lamp is always turned on regardless of EBD functions. The EBD warning lamp shall be on
- During the initialization phase after IGN ON. (continuously 3 seconds).
- When the Parking Brake Switch is ON or brake fluid level is low.
- When the EBD function is out of order.
- During diagnostic mode.
- When the ECU Connector is separated from ECU.
- Cluster lamp is ON when communication is impossible with CAN module.
ESC function/warning lamp
The ESC function/warning lamp indicates the self-test and failure status of the ESC.
The ESC function/warning lamp is turned on under the following conditions
- During the initialization phase after IGN ON. (continuously 3 seconds).
- When the ESC function is inhibited by system failure.
- When the ESC control is operating. (Blinking - 2Hz)
- During diagnostic mode. (Except standard mode)
- Cluster lamp is ON when communication is impossible with CAN module.
ESC Off Lamp
The ESC Off lamp indicates the self-test and operating status of the ESC.
The ESC Off lamp operates under the following conditions
- During the initialization mode after IGN ON. (continuously 3 seconds).
- ESC Off lamp is On when driver input the ESC Off switch.
ESC On/Off Switch
The ESC On/Off Switch shall be used to toggle the ESC function between On/Off states based upon driver input. The On/Off switch shall be a normally open, momentary contact switch. Closed contacts switch the circuit to ignition. Initial status of the ESC function is on and switch toggle the state.
Scheme 29
Scheme 30
Scheme 31
Scheme 32
Scheme 33
| Connector Terminal | Specification | Remark | |
|---|---|---|---|
| No | Description | ||
| 29 | IGNITION1(+) | High level of wake up voltage: 4.5V < V < 16.0V Low level of wake up voltage: V < 2.4V Max. current: I < 50mA | |
| 25 | POS. BATTERY 1. (SOLENOID) | Over voltage range: 17.0 ± 0.5V Operating voltage range: 10.0 ± 0.5V < V < 16.0 ± 0.5V Low voltage range: 7.0 ± 0.5V < V < 9.5 ± 0.5V Max. current: I < 40A Max. leakage current: I < 0.25mA | |
| 1 | POS. BATTERY 2. (MOTOR) | Operating voltage range: 10.0 ± 0.5V < V < 16.0 ± 0.5V Rush current: I < 110A Max current: I < 40A Max leakage current: I < 0.25mA | |
| 38 | GROUND | Rated current: I < 550mA Max. current: I < 40A | |
| 13 | PUMP MOTOR GROUND | Rush current: I < 110A Max current: I < 40A | |
| 11 | SENSOR GROUND | Rated current: I < 250mA | |
| 4 | SENSOR POWER | Max current Capability: I < 250mA Max voltage: V_BAT1 -0.8V | |
| 23 | BRAKE LIGHT SWITCH | Input voltage (Low): V < 2.0V Input voltage (High): V > 6.0V Max. Input current: I < 3mA (@12.8V) | |
| 10 | ESC ON/OFF SWITCH | ||
| 9 | BRAKE SWITCH | ||
| 22 | PARKING BRAKE SWITCH | Input voltage (Low): V < 2.0V Input voltage (High): V > 6.0V Max input current: I < 5mA (@12.8V) | |
| 35 | CLUTCH SWITCH | ||
| 28 | SENSOR FRONT RIGHT OUTPUT | External pull up resistance: 1 Kohms < R Output duty: 50 ± 20% | |
| 14 | CAN BUS LINE(LOW) | Max. Input current: I < 10mA | |
| 26 | CAN BUS LINE(HIGH) | ||
| 18 | SENSOR FRONT LEFT POWER | Output voltage: V_BAT1 -0.6V ~ V_BAT1 -1.1V Output current: Max 30mA | |
| 34 | SENSOR FRONT RIGHT POWER | ||
| 19 | SENSOR REAR LEFT POWER | ||
| 33 | SENSOR REAR RIGHT POWER | ||
| 31 | SENSOR FRONT LEFT SIGNAL | Input current LOW: 5.9 ~ 8.4mA Input current HIGH: 11.8 ~ 16.8mA Frequency range: 1 ~ 2, 500Hz Input duty: 50 ± 10% | |
| 21 | SENSOR FRONT RIGHT SIGNAL | ||
| 32 | SENSOR REAR LEFT SIGNAL | ||
| 20 | SENSOR REAR RIGHT SIGNAL | ||
| 12 | CAN SENSOR LINE (HIGH) | Max. input current: I < 10mA | |
| 24 | CAN SENSOR LINE (LOW) | ||
| 8 | HAC RELAY DRIVE | Max. current: I < 180mA Max output voltage: V< 1.2V | |
| 36 | HAC RELAY STATE MONITORING | Input voltage (Low): V < 2V Input voltage (High): V > 6V Max input current: I < 10mA (@12.8V) | |
| 11 | STEERING ANGLE SENSOR PHASE A | Input duty (STG A, STG B): 50 ± 10% Phase Difference (STG A, STG B): 2 ± 0.6 deg High voltage: 3.0V < V_H < 4.1V Low voltage: 1.3V < V_L < 2.0V | Without MDPS |
| 1 | STEERING ANGLE SENSOR PHASE B | ||
| 27 | STEERING ANGLE SENSOR PHASE Z | ||
Memory of Fail Code
- It keeps the code as far as the backup lamp power is connected. (O)
- It keeps the code as far as the HCU power is on. (X)
Failure Checkup
- Initial checkup is performed immediately after the HECU power on.
- Valve relay checkup is performed immediately after the IG2 ON.
- It executes the checkup all the time while the IG2 power is on.
- Initial checkup is made in the following cases. When the failure is not detected now When ABS and ESC are not in control. Initial checkup is not made after ECU power on. If the vehicle speed is over 5 mph(8 km/h) when the brake lamp switch is off. When the vehicle speed is over 24.8 mph(40 km/h).
- Though, it keeps on checkup even if the brake lamp switch is on.
- When performing ABS or ESC control before the initial checkup, stop the initial checkup and wait for the HECU power input again.
- Judge failure in the following cases. When the power is normal. From the point in which the vehicle speed reaches 4.9 mph(8 km/h) after HECU power on.
Countermeasures in Fail
- Turn the system down and perform the following actions and wait for HECU power OFF.
- Turn the valve relay off.
- Stop the control during the operation and do not execute any until the normal condition recovers.
Warning Lamp ON
- ESC warning lamp turn on for 3sec after IGN ON.
- ESC function lamp blinks when ESC Act.
- If ESC fail occured, ESC warning lamp turns ON.
- ESC OFF lamp turn on in case of ESC Switch OFF 3sec after IGN ON
Scheme 34
ABS Does Not Operate
| Trouble Symptoms | Possible Cause |
|---|---|
| Brake operation varies depending on driving conditions and road surface conditions, so diagnosis can be difficult. However if a normal DTC is displayed, check the following probable cause. When the problem is still occurring, replace the ESC control module. | Faulty power source circuit Faulty wheel speed sensor circuit Faulty hydraulic circuit for leakage Faulty HECU |
DETECTING CONDITION
Check the wheel speed sensor circuit
- Refer to the DTC troubleshooting procedures.
- Is it normal? YES Check the hydraulic circuit for leakage. NO Repair or replace the wheel speed sensor.
Check the hydraulic circuit for leakage
- Refer to the hydraulic lines.
- Inspect leakage of the hydraulic lines.
- Is it normal? YES The problem is still occurring, replace the ESC control module. NO Repair the hydraulic lines for leakage.
ABS Does Not Opterate (Intermittently)
| Trouble Symptoms | Possible Cause |
|---|---|
| Brake operation varies depending on driving conditions and road surface conditions, so diagnosis can be difficult. However if a normal DTC is displayed, check the following probable cause. When the problem is still occurring, replace the ESC control module. | Faulty power source circuit Faulty wheel speed sensor circuit Faulty hydraulic circuit for leakage Faulty HECU |
DETECTING CONDITION
- Refer to the DTC troubleshooting procedures.
- Is it normal? YES Check the stop lamp switch circuit. NO Repair or replace the wheel speed sensor.
Scheme 35
- Check that stop lamp lights up when brake pedal is depressed and turns off when brake pedal is released.
- Measure the voltage between terminal 23 of the ESC control module harness side connector and body ground when brake pedal is depressed. Specification: approximately B+
- Is the voltage within specification? YES Check the hydraulic circuit for leakage. NO Repair the stop lamp switch. Repair an open in the wire between the ESC control module and the stop lamp switch.
- Refer to the hydraulic lines.
- Inspection leakage of the hydraulic lines.
- Is it normal? YES The problem is still occurring, replace the ESC control module. NO Repair the hydraulic lines for leakage.
Communication with GDS is not possible
(Communication with any system in not possible.)
| Trouble Symptoms | Possible Cause |
|---|---|
| Possible defect in the power supply system (including ground) for the diagnosis line. | An open in the wire Poor ground Faulty power source circuit |
DETECTING CONDITION
Scheme 36
- Measure the voltage between terminal 16 of the data link connector and body ground. Specification: approximately B+
- Is voltage within specification? YES Check the ground circuit for the diagnosis. NO Repair an open in the wire. Check and replace fuse from the engine compartment junction block.
Scheme 37
- Check for continuity between terminal 4 of the data link connector and body ground.
- Is there continuity? NO Repair an open in the wire between terminal 4 of the data link connector and ground point.
(Communication with ABS only is not possible.)
| Trouble Symptoms | Possible Cause |
|---|---|
| When communication with GDS is not possible, the cause may be probably an open in the HECU power circuit or an open in the diagnosis output circuit. | An open in the wire Faulty HECU Faulty power source circuit |
DETECTING CONDITION
Check for Continuity in the CAN Line
- Disconnect the connector from the ESC control module.
- Check for continuity between terminals 26, 14 of the ESC control module connector and 6, 14 of the data link connector.
- Is there continuity? YES Check the power source of ESC control module. NO Repair an open in the wire.
Scheme 38
- Disconnect the connector from the ESC control module.
- Turn the ignition switch ON, measure the voltage between terminal 29 of the ESC control module harness side connector and body ground. Specification: approximately B+
- Is voltage within specification? YES Check for poor ground. NO Check the harness or connector between the fuse (10A) in the engine compartment junction block and the ESC control module. Repair if necessary.
Scheme 39
- Check for continuity between terminal 4 of the data link connector and ground point. YES Replace the ESC control module and recheck. NO Repair an open in the wire or poor ground
When Ignition Key Is Turned ON (engine OFF), The ABS Warning Lamp Does Not Light Up
| Trouble Symptoms | Possible Cause |
|---|---|
| When current flows in the HECU the ABS warning lamp turns from ON to OFF as the initial check. Therefore if the lamp does not light up, the cause may be an open in the lamp power supply circuit, a blown bulb, an open in the both circuits between the ABS warning lamp and the HECU, and the faulty HECU. | Faulty ABS warning lamp bulb Blown fuse is related to ABS in the engine compartment junction block Faulty ABS warning lamp module Faulty HECU |
DETECTING CONDITION
Problem verification
- Disconnect the connector from the ESC control module and turn the ignition switch ON.
- Does the ABS warning lamp light up? YES Inspect again after replacing the ESC HECU. NO Check the power source for the ABS warning lamp.
Scheme 40
- Disconnect the instrument cluster connector (M01) and turn the ignition switch ON.
- Measure the voltage between terminal (M01) 26 of the cluster harness side connector and body ground. Specification: approximately B+
- Is voltage within specification? YES Check the CAN circuit resistance for ABS warning lamp. NO Check for blown fuse.
Scheme 41
- Disconnect the instrument cluster connector (M01) and turn the ignition switch OFF.
- Measure the resistance between terminal (M01) 29 and 30 of the cluster harness side connector. Specification: 60ohms
- Is resistance within specification? YES Repair ABS warning lamp bulb or instrument cluster assembly. NO Check the CAN circuit wiring for ABS warning lamp.
Even After The Engine Is Started, The ABS Warning Lamp Remains ON
| Trouble Symptoms | Possible Cause |
|---|---|
| If the HECU detects trouble, it lights the ABS warning lamp while at the same time prohibiting ABS control. At this time, the HECU records a DTC in memory. Even though the normal code is output, the ABS warning lamp remains ON, then the cause may be probably an open or short in the ABS warning lamp circuit. | An open in the wire Faulty instrument cluster assembly Faulty ABS warning lamp module Faulty HECU |
DETECTING CONDITION
Advantages
- Function improvement of the base-brake system.
- Compensation for the different friction coefficients.
- Elimination of the proportioning valve.
- Failure recognition by the warning lamp.
Scheme 42
Scheme 43
Scheme 44
Scheme 45
Scheme 46
- Turn ignition switch OFF.
- Pull up the lock of the HECU connector (A), and then disconnect the connector.
- Disconnect the brake tubes from the HECU by unlocking the nuts counterclockwise with a spanner. Tightening torque: A: 12.7 ~ 16.7 N.m (1.3 ~ 1.7 kgf.m, 9.4 ~ 12.3 lb-ft) B: 18.6 ~ 22.6 N.m (1.9 ~ 2.3 kgf.m, 13.7 ~ 16.6 lb-ft)
- Loosen the HECU bracket nuts (A), then remove HECU and bracket. Tightening torque: 16.7 ~ 25.5 N.m (1.7 ~ 2.6 kgf.m, 12.3 ~ 18.8 lb-ft) CAUTION: Never attempt to disassemble the HECU. The HECU must be transported and stored in. Never shock to the HECU.
- Remove the 3 bolts, and then remove the bracket from HECU. Tightening torque: 11 ~ 14 N.m (1.1 ~ 1.4 kgf.m, 8.1 ~ 10.3 lb-ft)
Measuring Principle
The split of the steering angle sensor detects a steering angle of the steering wheel by a ON/OFF pulse caused by whether or not the LED lights go through the hole of the split, rotating as the steering wheel revolves. There are three LEDs, two(ST1, ST2) for detecting a steering direction, and the other for the neutral position. The HECU calculates the steering angle by the pulse from the steering angle sensor.
Scheme 47
| Description | Specification |
|---|---|
| Operating voltage | 9 ~ 16 V |
| Operating temperature | 30 ~ 75 °C |
| Current consumption | Max.100 mA |
| Steering angle velocity | Max. ± 1500 °/sec |
| Voltage(high) | 3.0 V ~ 4.1 V |
| Voltage(low) | 1.3 V ~ 2.0 V |
| Pulse duty | 40 ~ 60 % |
STEERING ANGLE SENSOR SPECIFICATION
