NEXON DIAGNOSTIC MANUAL

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Author: Balaji / Amar /

Nitin / Umapathi /

Deepak

Page: 27 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.

B1938 - 06:- Vehicle Speed Sensor Algorithm Based Failure

Overview:-

ISO Code

B1938 – 06

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

w.r.to

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 Off/On

Component Details:-

Vehicle Speed Sensor - This sensor gives direct pulse input to the Cluster

w.r.to

the wheel rotation or vehicle speed.

Preliminary Checks:-

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

2. Check Fuel lines for Pinch/Cut.

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

4. Check and ensure Speed Sensor is giving linear pulse output

w.r.to

the vehicle speed.

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

design specifications.