NEXON DIAGNOSTIC MANUAL

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Author: Balaji / Amar /

Nitin / Umapathi /

Deepak

Page: 31 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.

B1939 - 86:- Vehicle Speed Signal output Implausible Signal Invalid

Overview:-

ISO Code

B1939 – 86

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. The normal operating range is

b/w 2 to 260 Hz.

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 Off/On

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 sensor lines for Pinch/Cut.

3. Check ECU & Sensor pins for oxidation, bending & damage.

4. Check Sensor input on Pin no. 27(VSS i/p) & 31(VSS Gnd) of the wired connector, whether it is exact to the

Speedometer table.