Vsa System Components: Other Honda Insight ZE2

System Indicator

This system has five indicators

1. ABS indicator (A)
2. Brake system indicator (red) (B)
3. VSA indicator (C)
4. VSA OFF indicator (D)
5. Brake system indicator (amber) (E)

Scheme 83

When the system is OK, each indicator comes on for about 2 seconds after turning the ignition switch to ON (II), then goes off.

When the system detects a problem, a DTC will set and, depending upon the failure, the VSA modulator-control unit determins which indicator(s) will turn on. If the problem goes away (system returns to normal), the indicator(s) will be controlled in the following way depending upon the DTC that was set

1. The indicator(s) will come on and stay on when the ignition switch is ON (II).
2. The indicator(s) will automatically go off.
3. The indicator(s) will go off after the vehicle is driven.

ABS Indicator

The ABS indicator comes on when the ABS function is lost. The brakes still work like a conventional system.

Brake System Indicator (Red)

The brake system indicator (red) comes on when the electronic brake distribution (EBD) function is lost, the parking brake is applied, and/or the brake fluid level is low.

Note. If two or more wheel speed sensors fail, the brake system indicator (red) will come on.

VSA Indicator

The VSA indicator comes on when the VSA function is lost. The VSA indicator blinks when the VSA function is activating.

VSA OFF Indicator

The VSA OFF indicator comes on, when the VSA is turned OFF by using the VSA OFF switch.

Brake System Indicator (Amber)

The brake system indicator (amber) comes on, when the creep aid system (CAS) function is lost.

ABS, VSA, and Brake System Indicators (Amber) go off

Each indicator will go off after a problem goes away, but the timing which the VSA modulator-control unit turns off the indicators varies between DTCs.

1. DTC 61,62,84,158: The indicators go off automatically when the system returns to normal.
2. DTC 11, 13, 15, 17, 25-27, 31-38, 54, 64-66, 68, 81, 83, 86, 91, 104, 105, 117, 121-124: The indicators stay on until the ignition switch is turned to LOCK (0) whether or not the system returns to normal.
3. DTC 12, 14, 16, 18, 21-24, 51,52: The indicators stay on until the vehicle is driven after the system returns to normal.

Kickback

The pump motor operates when the VSA modulator-control unit is functioning, and the fluid in the reservoir is forced out to the master cylinder, causing kickback at the brake pedal.

Pump Motor

1. The pump motor operates when the VSA modulator-control unit is functioning.
2. The VSA modulator-control unit checks the pump motor operation one time after completing initial diagnosis and during regular diagnosis when the vehicle is driven over 10 mph (15 km/h).

Intermittent Failures

The term "intermittent failure" means a system may have had a failure, but it checks OK now. If the indicator(s) of the system does not come on, check for loose connectors or poor contacts in the terminals related to the circuit that you are troubleshooting.

How to Retrieve DTCs

1. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-360284-S14481644492010042800000) ).
4. Follow the prompts on the HDS to display the DTC(s) on the screen. After determining the DTC, refer to the «DTC TROUBLESHOOTING»(ref-360304-S16064692842010042800000) .
5. Turn the ignition switch to LOCK (0).

How to Clear DTCs

1. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-360284-S14481644492010042800000) ).
4. Clear the DTC(s) by following the screen prompts on the HDS.
5. Turn the ignition switch to LOCK (0).

Scheme 84

1. Connect one side of the patch cord (A) terminals to a commercially available digital multimeter (B), and connect the other side of the patch cord terminals to a commercially available banana jack (C).

System Outline

This system is composed of the VSA modulator-control unit, the wheel speed sensors, the steering angle sensor, the yaw rate-lateral acceleration sensor, and the system indicators in the gauge control module. The VSA modulator-control unit controls the ABS, EBD, TCS, VSA, CAS, and brake assist with the brake pressure of each wheel.

Scheme 85

Anti-lock Control

Without ABS, when the brake pedal is pressed while driving, the wheels sometimes lock before the vehicle comes to a stop. In such an event, the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of the vehicle is reduced if the rear wheels are locked, creating an extremely unstable condition. With ABS, the system precisely controls the slip rate of the wheels to ensure maximum grip force from the tires, and it thereby ensures maneuverability and stability of the vehicle. The ABS calculates the slip rate of the wheels based on the four wheel speeds, and then it controls the brake fluid pressure to reach the target slip rate.

Scheme 86

Main Control

The control unit detects the wheel speed based on the wheel speed sensor signals it receives, then it calculates the vehicle speed based on the detected wheel speed. The control unit detects the vehicle speed during deceleration based on the wheel speeds.

The control unit calculates the slip rate of each wheel, and transmits the control signal to the modulator unit solenoid valve when the slip rate is high.

The hydraulic control has three modes: Pressure retaining, pressure reducing, and pressure intensifying.

Scheme 87

EBD (Electronic Brake Distribution) Features

The EBD feature helps control vehicle braking by adjusting the rear brake force in accordance with the rear wheel load before the ABS operates. Based on the wheel speed sensor signals, the control unit uses the modulator to control the rear brakes individually. When the rear wheel speed is less than the front wheel speed, the VSA modulator-control unit retains the current rear brake fluid pressure by closing the inlet valve in the modulator. As the rear wheel speed increases and approaches the front wheel speed, the VSA modulator-control unit increases the rear brake fluid pressure by momentarily opening the inlet valve. This whole process is repeated very rapidly. While this is happening, kickback may be felt at the brake pedal, you may also hear a muted buzzing sound. This is normal.

Scheme 88

TCS (Traction Control System) Features

When a drive wheel loses traction on a slippery road surface and starts to spin, the VSA modulator-control unit applies brake pressure to the spinning wheel and sends an engine torque control request to the PCM to slow the spinning wheel and keep traction.

Scheme 89

Oversteer control

Applies the brake to the front and rear outside wheels

Scheme 90

Scheme 91

1. Applies the brake to the front and rear inside wheels
2. Controls the engine torque when accelerating

Brake Assist Features

Brake assist helps ensure that any driver can achieve the full braking potential of the vehicle by increasing brake system pressure in a panic situation, bringing the vehicle into a full ABS stop.

If during a panic stop the VSA modulator-control unit determines that the brake system pressure increases above a threshold in less than a certain amount of time, the VSA modulator-control unit engages brake assist.

Because the brake system pressure crossed the pressure threshold before the time threshold had expired, the VSA modulator-control unit goes into brake assist mode.

Scheme 92

Creep Aid System (CAS) Features

This system prevents the vehicle from rolling forward or backward on a hill during which the driver releases the brake pedal by controlling the brake pressure.

When the VSA modulator control unit receives a CAS activation request signal from the PCM, the system assists the driver to get the vehicle started by holding the brake pressure. This control is done not only on hills, but also on level roads. When the driver lifts his foot off the brake pedal to get the vehicle started, the brake switch is turned off, and then the brake pressure is held by operating the TCS valve and the CAS valve.

Scheme 93

Modulator Unit

The modulator unit consists of the inlet solenoid valve, the outlet solenoid valve, the CAS NO (normally open) solenoid valve, the CAS NC (normally closed) solenoid valve, the reservoir, the pump, and the pump motor.

The hydraulic control has three modes of ABS action; pressure intensifying, pressure retaining, and pressure reducing. The pressure adding mode is combined at TCS, VSA, and brake assist action with the CAS NO solenoid valve and CAS NC solenoid valve.

The hydraulic circuit is an independent four channel type; one channel for each wheel.

Scheme 94

VALVE SPECIFICATION

Scheme 95

Scheme 96

Scheme 97

VSA Sensor Neutral Position Memorization

Note. Do not press the brake pedal during this procedure.

Scheme 98

1. Park the vehicle on a flat and level surface, with the steering wheel in the straight ahead position.
2. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) (A) under the driver's side of the dashboard.
3. Turn the ignition switch to ON (II).
4. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-360284-S14481644492010042800000) ).
5. Select VSA ADJUSTMENT with the HDS, and follow the screen prompts. NOTE: See the HDS Help menu for specific instructions.
6. Turn the ignition switch to LOCK (0).

Scheme 99

Scheme 100

Scheme 101

1. Turn the ignition switch to LOCK (0).
2. Push out the VSA OFF switch (A) from the back of the instrument panel.
3. Disconnect the VSA OFF switch 5P connector (B).
4. Check for continuity between VSA OFF switch 5P connector terminals No. 1 and No. 2. There should be continuity when the button is released, and no continuity when the button is pressed.
5. Check for continuity between VSA OFF switch 5P connector terminals No. 4 and No. 5. There should be continuity at all times.
6. Install the VSA OFF switch in the reverse order of removal.

VSA Modulator-Control Unit Update

Special Tools Required

1. Honda Diagnostic System (HDS) tablet tester*
2. Honda Interface Module (HIM) and an iN workstation with the latest HDS software version*
3. HDS pocket tester*
4. GNA600 and an iN workstation with the latest HDS software version*

*Available through the Honda Tool and Equipment Program 888-424-6857

Use any one of these update tools.

Note. Use this procedure when you need to update the VSA modulator-control unit at any time. Make sure the HDS/iN workstation has the latest HDS software version. Before you update the VSA modulator-control unit, make sure the battery in the vehicle is fully charged, and connect a jumper battery (not a battery charger) to maintain system voltage. Never turn the ignition switch to LOCK (0) or ACC (I) during the update. If there is a problem with the update, leave the ignition switch in ON (II). To prevent VSA modulator-control unit damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, door locks, etc.) during the update. To ensure the latest program is installed, do a VSA modulator-control unit update whenever the VSA modulator-control unit is substituted or replaced. You cannot update a VSA modulator-control unit with a program it already has. It will only accept a new program. High temperature in the engine compartment might cause the VSA modulator-control unit to become too hot to run the update. If the engine has been running before this procedure, open the hood and cool the engine compartment. If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashing during the update, leave the ignition switch in ON (II) when you disconnect the HIM from the data link connector (DLC). This will prevent VSA modulator-control unit damage. DTCs stored in memory are cleared when the VSA modulator-control unit is updated.

Scheme 102

1. Turn the ignition switch to ON (II), but do not start the engine.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Make sure the HDS communicates with the vehicle and the VSA modulator-control unit. If it doesn't, troubleshooting the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-360284-S14481644492010042800000) ).
4. Select the update mode, and follow the screen prompts to update the VSA modulator-control unit.
5. If the software in the VSA modulator-control unit is the latest, disconnect the HDS/HIM from the DLC. If the software in the VSA modulator-control unit is not the latest, follow the instructions on the screen.
6. Do the VSA sensor neutral position memorization procedure (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(ref-360304-S28032648402010042800000) ).