NEXON DIAGNOSTIC MANUAL

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Author: Balaji / Amar /

Nitin / Umapathi /

Deepak

Page: 15 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.

Preliminary Checks:-

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

2. Check OAT lines for Pinch/Cut.

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

4. Check and ensure OAT Sensor is giving linear Resistance output

w.r.to

the Temperature change.

5. Check Sensor resistance on Pin no. 29(OAT i/p) & 31(OAT Gnd) of the wired connector, whether it is according to

the design specifications (between 320 to 100.923k ohm).

Trouble Shooting:-

Turn ON Ignition.

Connect the TML Diagnostic Tool.

Check the status of DTC’s (Memorized/Current)

Record the DTC & Clear DTC’s

Turn Ignition OFF & ON

Verify If DTC B190B -15 is present

Is DTC

B190B-15 is

Present?

Check for continuity between

Pin No.J1-1(Batt) & J1-29 of

ECU Connector or OAT

harness is open circuited.

Is STB or

Open is

present?

OAT input is Short Circuit to Battery or Open.

Rectify Fault at wiring Harness & wait for

20sec to recover the fault.

Clear the DTC. Verify the function of OAT

Sensor with multimeter & OAT value on

display.

Clear the DTC from the ECU memory.

Turn Ignition OFF & ON.

Press the mode switch button one time

to show the OAT display value &

Check whether display is showing the

OAT value in Deg.C.

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