HEXA

ELECTRONIC STABILITY PROGRAM (ESP)

In normal conditions when the ignition is switched

on the ESP, ABS and EBD lamp will come on and

then switch off after 3 seconds. During this period

the system will perform a self-diagnostic to

confirm all inputs and outputs are working

correctly.

In addition to this, the ESP warning lamp will blink

during ESP Intervention or TCS intervention.

If the ESP warning lamp remains on after this time

it means either

1. The ESP system has not been connected or

2. The system has detected a failure and has to

be diagnosed

If the ABS warning lamp remains on after this time

it means either:

1. The ABS system has not been connected or

2. The system has detected a failure and will

need to be diagnosed.

The EBD lamp is shared with the brake fluid level

and parking brake, hence if the EBD warning lamp

remains on after this time it means either:

1. The park brake is applied

2. The Brake fluid level is low

3. The ABS system has not been connected. or

4. The system has detected a failure and will

need to be diagnosed.

If the warning light does not come on, the fault

should be sought in the electrical connections of

instrument cluster (for ignition switch, ECU), fuse

or warning lamp.

If the ESP system detects any fault that may

adversely affect its performance it will switch to a

failsafe shut down mode. When this happens the

electricity supply to the solenoid valves is

deactivated, stopping control signal output, this

causes the valves to switch to their default state.

(Open for inlet valves / Closed for Outlet valves).

In this condition, the conventional hydraulic brake

circuit will still function, allowing brake pressure to

reach all wheels. It should be noted that with an

ESP fault the system will not be able to stabilise

the vehicle when it is starting to skid or when the

wheels are starting to spin.

In the case of ABS fault the wheels may lock

during braking and in the case of an EBD failure

the brake force proportioning between front and

rear will no longer function and hence rear wheels

may get locked before front wheel lock.

19.4 On vehicle REPAIRS

NOTE

Refer ABS “REPAIRS” sections for the removal of

ECU, Wheel speed sensors and HCU.

A. YAW RATE SENSOR REMOVAL.

1. Switch of the Ignition and disconnect the

battery.

2. Remove the Floor console.

(For procedure

refer Body group.)

3. Disconnect the Yaw rate sensor electrical

connecter.

4. Loosen and remove the 2 bolts and take out

the Yaw Rate sensor.

INSPECTION

Physical Inspection:

Inspect the yaw rate sensor

and replace if the following is found



If the connecter is damaged, scratched or

cracked.



If the sensor has been dropped.



If surface of the sensor is cracked, dented or

chipped off.