ABS Components: Other Honda Insight ZE2

System Indicator

This system has three indicators

1. ABS indicator (A)
2. Brake system indicator (red) (B)
3. Brake system indicator (amber) (C)

Scheme 18

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 is set and, depending upon the failure, the ABS modulator-control unit determines which indicator(s) are turned on. If the problem goes away (system returns to normal), the indicator(s) are 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) automatically go off.
3. The indicator(s) 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.

Brake System Indicator (Amber)

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

ABS Indicator, and Brake system Indicator (Amber) go off

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

1. DTC 61,62: The indicators go off automatically when the system returns to normal.
2. DTC 11, 13, 15, 17, 31-38, 54, 64, 66, 68, 81, 83, 86, 105, 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 ABS 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 ABS modulator-control unit is functioning.
2. The ABS modulator-control unit checks the pump motor operation one time after completing initial diagnosis 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 ABS 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-360303-S05206264672010042800000) . Do all systems DTC check, and troubleshoot any powertrain DTCs first.
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 ABS 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 19

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 ABS modulator-control unit, the wheel speed sensors, and the system indicators in the gauge control module. The ABS modulator-control unit controls the ABS, EBD, CAS, and brake assist with the brake pressure of each wheel.

Scheme 20

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 21

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 22

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 ABS 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 ABS 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, there may be kickback at the brake pedal, and you may also hear a muted buzzing sound. This is normal.

Scheme 23

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

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

Scheme 24

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 ABS 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 25

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 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 26

IN INLET SOLENOID VALVE (NORMALLY OPEN) OUT. OUTLET SOLENOID VALVE (NORMALLY CLOSED)

SOLENOID VALVE REFERENCE

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Test-drive the vehicle at 19mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
5. Check for DTCs with the HDS. Is DTC 11, 13, 15, and/or 17 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for loose terminals between the wheel speed sensor 2P connector and the ABS modulator-control unit 47P connector. Refer to intermittent failures troubleshooting (see «PUMP MOTOR»(ref-360303-S20667346682010042800000) ).
6. Turn the ignition switch to LOCK (0).
7. Disconnect the ABS modulator-control unit 47P connector, (see «ABS MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(ref-360303-S07152304642010042800000) ).
8. Check for continuity between body ground and the appropriate wheel speed sensor +B and GND terminals of the ABS modulator-control unit 47P connector individually (see table). DTC CHART DTC Appropriate Terminal +B GND 11 (Right-front) FR+B: No. 34 FR-GND: No. 33 13 (Left-front) FL+B: No. 45 FL-GND: No. 46 15 (Right-rear) RR+B: No. 43 RR-GND: No. 42 17 (Left-rear) RL+B: No. 36 RL-GND: No. 37 Is there continuity? YES -Go to step 9. NO -Go to step 11 .
9. Disconnect the appropriate wheel speed sensor 2P connector.
10. On the sensor side, check for continuity between the wheel speed sensor 2P connector terminals No. 1 and No. 2 and body ground. Is there continuity? YES -Replace the wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(ref-360303-S06500296222010042800000) ). NO -Repair a short to body ground in the wire between the ABS modulator-control unit and the wheel speed sensor.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between body ground and the appropriate wheel speed sensor +B and GND terminals of the ABS modulator-control unit 47P connector individually (see table). DTC CHART DTC Appropriate Terminal +B GND 11 (Right-front) FR+B: No. 34 FR-GND: No. 33 13 (Left-front) FL+B: No. 45 FL-GND: No. 46 15 (Right-rear) RR+B: No. 43 RR-GND: No. 42 17 (Left-rear) RL+B: No. 36 RL-GND: No. 37 Is there 0.1V or more? YES -Go to step 13. NO -Go to step 17 .
13. Turn the ignition switch to LOCK (0).
14. Disconnect the appropriate wheel speed sensor 2P connector.
15. Turn the ignition switch to ON (II).
16. On the sensor side, measure the voltage between the wheel speed sensor 2P connector terminals No. 1 and No. 2 and body ground. Is there 0.1 V or more? YES -Replace the wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(ref-360303-S06500296222010042800000) ). NO -Repair a short to power in the wire between the ABS modulator-control unit and the appropriate wheel speed sensor.
17. Turn the ignition switch to LOCK (0).
18. Disconnect the appropriate wheel speed sensor 2P connector.
19. Check for continuity between the appropriate ABS modulator-control unit 47P connector wheel speed sensor +B and GND terminals (see table). DTC CHART DTC Appropriate Terminal +B GND 11 (Right-front) FR+B: No. 34 FR-GND: No. 33 13 (Left-front) FL+B: No. 45 FL-GND: No. 46 15 (Right-rear) RR+B: No. 43 RR-GND: No. 42 17 (Left-rear) RL+B: No. 36 RL-GND: No. 37 Is there continuity? YES -Repair a short in the wires between the appropriate wheel speed sensor and the ABS modulator-control unit. NO -Go to step 20.
20. Check for continuity between the appropriate ABS modulator-control unit 47P connector terminal and the wheel speed sensor 2P connector terminal (see table). WHEEL SPEED SENSOR SPECIFICATION DTC Appropriate Wheel Speed Sensor Appropriate Terminal 11 Right-front FR+B: No. 34 13 Left-front FL+B: No. 45 15 Right-rear RR+B: No. 43 17 Left-rear RL+B: No. 36 Is there continuity? YES -Go to step 21. NO -Repair an open in the wire between the appropriate wheel speed sensor and the ABS modulator-control unit.
21. Check for continuity between the appropriate ABS modulator-control unit 47P connector terminal and the wheel speed sensor 2P connector terminal (see table). WHEEL SPEED SENSOR SPECIFICATION DTC Appropriate Wheel Speed Sensor Appropriate Terminal 11 Right-front FR-GND: No. 33 13 Left-front FL-GND: No. 46 15 Right-rear RR-GND: No. 42 17 Left-rear RL-GND: No. 37 Is there continuity? YES - If the DTCs indicate one wheel speed sensor (either the right or left) on the same axle (front or rear), go to step 22. If the DTCs indicate both wheel speed sensors (right and left) on the same axle (front or rear), go to step 29. Go to step 20. NO -Repair an open in the wire between the appropriate wheel speed sensor and the ABS modulator-control unit.
22. Swap the applicable left and right wheel speed sensors.
23. Reconnect all connectors.
24. Turn the ignition switch to ON (II).
25. Clear the DTC with the HDS.
26. Turn the ignition switch to LOCK (0).
27. Test-drive the vehicle at 19mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
28. Check for DTCs with the HDS. Is DTC 11, 13, 15, and/or 17 indicated? YES -Check for loose terminals in the ABS modulator-control unit 47P connector. If OK, replace the ABS modulator-control unit (see «ABS MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(ref-360303-S07152304642010042800000) ). NO -Go to step 29.
29. Substitute a known-good wheel speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(ref-360303-S06500296222010042800000) ).
30. Reconnect all connectors.
31. Turn the ignition switch to ON (II).
32. Clear the DTC with the HDS.
33. Turn the ignition switch to LOCK (0).
34. Test-drive the vehicle at 19 mph (30 km/h) or more. NOTE: Drive the vehicle on the road, not on a lift.
35. Check for DTCs with the HDS. Is DTC 11, 13, 15, or 17 indicated? YES -Check for loose terminals in the ABS modulator-control unit 47P connector. If OK, replace the ABS modulator-control unit (see «ABS MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(ref-360303-S07152304642010042800000) ). NO -Replace the original speed sensor (see «WHEEL SPEED SENSOR REPLACEMENT»(ref-360303-S06500296222010042800000) ).