NEXON DIAGNOSTIC MANUAL

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Author: Balaji / Amar /

Nitin / Umapathi /

Deepak

Page: 35 of 138

TATA MOTORS Ltd.

This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author.

B191C - 11:- Vehicle Speed Sensor Power Supply Output Short To Ground

Overview:-

ISO Code

B191C – 11

Customer Symptom

No Speedometer indication in Gauge

Fault Effects (On Vehicle)

N/A

Lamp Status (If Any)

N/A

Fault Detection Condition

During vehicle running Speedometer pointer shall be at ‘0’

position.

Normal Operating Condition

Speedometer gauge shall move the pointer

the speed

sensor input frequency pulses.

Probable Trouble Area

Related wiring Harness, connector or terminals damaged

IPC connector wired wrong,

Harness wire shorted,

Sensor connector wired wrong,

Sensor damaged

Healing Condition

Clearing fault. Ignition On/Off

Component Details:-

VSS Sensor - It gives direct frequency pulse input to the Cluster

the wheel rotation. It indicates the vehicle speed

with pointer position in gauge.

Preliminary Checks:-

1. Check Battery Voltage is normal in the range (9v - 16v)

2. Check VSS power o/p lines for Pinch/Cut.

3. Check ECU & VSS power pins for oxidation, bending & damage.

4. Check Speed Sensor Power o/p at Pin no. J1-3(o/p) of the ECU connector, it should be same as battery voltage.