No.1 ESS (EMERGENCY STOP SIGNAL SYSTEM) DOES NOT OPERATE [ESS (EMERGENCY STOP SIGNAL SYSTEM) ]

id0903j7004200

1

ESS (Emergency Stop Signal system) does not operate

DESCRIPTION

•  Hazard warning lights do not flash even though vehicle decelerates suddenly.

•  Hazard warning lights end flashing before vehicle stops (emergency stop hazard warning mode, vehicle speed at approx. 10 km/h {6.2 mph}) while system operates.

POSSIBLE CAUSE

Hazard warning light flash malfunction

•  BCM malfunction (flashing hazard warning light circuit malfunction)

DSC/RSC CM do not recognize vehicle speed.

•  Malfunction in ABS wheel speed sensor related parts

―  ABS wheel-speed sensor malfunction

―  ABS wheel-speed sensor rotor malfunction

•  DSC/RSC CM malfunction

BCM does not recognize sudden deceleration hazard warning mode request signal.

•  DSC/RSC CM malfunction (signal is not output)

•  BCM malfunction

•  Communication error between DSC/RSC CM and BCM

BCM does not recognize emergency stop hazard warning mode request signal.

•  Brake switch signal malfunction

―  Brake switch malfunction

―  Open or short circuit between brake switch and PCM terminal 1T (PCM CONNECTOR 2TYPES)/1S (PCM CONECTOR 3TYPES)

•  Vehicle speed signal malfunction

―  Communication error between PCM and DSC/RSC CM

•  BCM malfunction

Road condition may be affected. (emergency braking warning system is normal)

•  Grip level of tires is low

―  Driving on a low-traction surface

―  Tire wear (hydroplaning)

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY DTCs

•  Retrieve DTCs for the PCM, DSC/RSC CM, and BCM.
(See ON-BOARD DIAGNOSTIC TEST [MZI-3.7 (PCM CONNECTOR (2 TYPES))].)

(See ON-BOARD DIAGNOSTIC TEST [MZI-3.7 (PCM CONNECTOR (3 TYPES))].)

(See ON-BOARD DIAGNOSIS [DSC/RSC].)

(See DTC INSPECTION [BCM].)

•  Are any DTCs output?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZI-3.7 (PCM CONNECTOR (2 TYPES))].)

(See DTC TABLE [MZI-3.7 (PCM CONNECTOR (3 TYPES))].)

(See ON-BOARD DIAGNOSIS [DSC/RSC].)

(See DTC TABLE [BCM].)

No

Go to the next step.

2

VERIFY MALFUNCTION CONDITION

•  Do the hazard warning lights flash in the emergency stop hazard warning mode while the vehicle speed is 10 km/h {6.2 mph} or less?

Yes

Go to the next step.

No

Go to Step 5.

3

DETERMINE IF MALFUNCTION CAUSED BY PCM INPUT SIGNAL ERROR

•  Monitor the PCM PID “BOO” using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZI-3.7 (PCM CONNECTOR (2 TYPES))].)

(See ON-BOARD DIAGNOSTIC TEST [MZI-3.7 (PCM CONNECTOR (3 TYPES))].)

•  Are the monitoring values normal?

Yes

May be affected by driving conditions (emergency braking warning system is normal).

If a malfunction occurs, replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Go to the next step.

4^*

INSPECT BRAKE SWITCH SIGNAL FOR MALFUNCTION CAUSED BY OPEN OR SHORT CIRCUIT

•  Inspect the wiring harness between the brake switch and PCM 1T (PCM CONNECTOR 2TYPES)/1S (PCM CONECTOR 3TYPES) for an open or short circuit.

•  Is there any open or short circuit?

Yes

Repair the malfunctioning part for an open or short circuit.

No

Replace the brake switch.

(See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].)

5

INSPECT FLASHING HAZARD WARNING LIGHT CIRCUIT FOR MALFUNCTION

•  Flashes the hazard warning lights using the hazard warning switch.

•  Do the hazard warning lights flash?

Yes

Go to the next step.

No

Replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

6

DETERMINE IF MALFUNCTION CAUSED BY ABS OPERATION MALFUNCTION

•  Inspect the ABS operation at 10—20 km/h {6.2—12.0 mph}.

•  Is the ABS operation normal?

Yes

System may be affected by road conditions (emergency braking warning system is normal).

If the malfunction recurs, replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

•  Inspect the tires for the following:

―  Tire air pressure (are all four tires at recommended pressure?)

―  Tire wear condition (is tire wear uniform on all four tires, or is it different?)

―  Tire size

Adjust the malfunctioning tire or replace it.

Step	Inspection		Action
1	VERIFY DTCs • Retrieve DTCs for the PCM, DSC/RSC CM, and BCM. (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7 (PCM CONNECTOR (2 TYPES))].) (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7 (PCM CONNECTOR (3 TYPES))].) (See ON-BOARD DIAGNOSIS [DSC/RSC].) (See DTC INSPECTION [BCM].) • Are any DTCs output?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7 (PCM CONNECTOR (2 TYPES))].) (See DTC TABLE [MZI-3.7 (PCM CONNECTOR (3 TYPES))].) (See ON-BOARD DIAGNOSIS [DSC/RSC].) (See DTC TABLE [BCM].)
1		No	Go to the next step.
2	VERIFY MALFUNCTION CONDITION • Do the hazard warning lights flash in the emergency stop hazard warning mode while the vehicle speed is 10 km/h {6.2 mph} or less?	Yes	Go to the next step.
2		No	Go to Step 5.
3	DETERMINE IF MALFUNCTION CAUSED BY PCM INPUT SIGNAL ERROR • Monitor the PCM PID “BOO” using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7 (PCM CONNECTOR (2 TYPES))].) (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7 (PCM CONNECTOR (3 TYPES))].) • Are the monitoring values normal?	Yes	May be affected by driving conditions (emergency braking warning system is normal). If a malfunction occurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
3		No	Go to the next step.
4^*	INSPECT BRAKE SWITCH SIGNAL FOR MALFUNCTION CAUSED BY OPEN OR SHORT CIRCUIT • Inspect the wiring harness between the brake switch and PCM 1T (PCM CONNECTOR 2TYPES)/1S (PCM CONECTOR 3TYPES) for an open or short circuit. • Is there any open or short circuit?	Yes	Repair the malfunctioning part for an open or short circuit.
4^*		No	Replace the brake switch. (See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].)
5	INSPECT FLASHING HAZARD WARNING LIGHT CIRCUIT FOR MALFUNCTION • Flashes the hazard warning lights using the hazard warning switch. • Do the hazard warning lights flash?	Yes	Go to the next step.
5		No	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
6	DETERMINE IF MALFUNCTION CAUSED BY ABS OPERATION MALFUNCTION • Inspect the ABS operation at 10—20 km/h {6.2—12.0 mph}. • Is the ABS operation normal?	Yes	System may be affected by road conditions (emergency braking warning system is normal). If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
6		No	• Inspect the tires for the following: ― Tire air pressure (are all four tires at recommended pressure?) ― Tire wear condition (is tire wear uniform on all four tires, or is it different?) ― Tire size Adjust the malfunctioning tire or replace it.