NEXON DIAGNOSTIC MANUAL

Nexon Gasoline – EMS ECU Bosch

DTC Troubleshooting Manual

Version: 0.1

Date: 26-08-2017

Prepared By: Sunu S Babu/Yogesh Jadhav

Checked By: Yeshwant Jadhav

Approved By: Satish Kumar

Document Part No: 2921 02 224 A1736

Page: 66 of 1203

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.

P0032-12: HO2S Heater Control Circuit High (Bank 1 sesnor 1) – Circuit Short to Battery

Overview:

ISO Code

P0032-12

Customer Symptom

1. No effect on engine starting.

2. Lambda control will be deactivated.

Fault Effects (On Vehicle)

1. Vehicle running in Open loop initially for a longer time.

2. No effect on starting and driveability

Lamp Status (If Any)

MIL ON after 3 drive cycles.

Fault Detection Condition

When the Engine is running and the Upstream oxygen Sensor heater control

pin of EMS ecu is short Circuited to battery.

Normal Operating Condition

Upstream Oxygen Sensor provides plausible signal to EMS ECU.

Probable Trouble Area

Wiring Harness connections, Sensor

1.Heater Line shorted to battery for upstream sensor

2. Faulty Lambda sensor

3. Faulty ECU.

Healing Condition

Engine State Running and 3 drive cycles

Fault Permanent deletion

1. Clear DTC Command form Scan tool

2. Stack Over Flow.

3. 40 warm up cycles.

4. ECU Flashing.

5. ECU Power-Fail

Component Details:

The oxygen Sensor operates on the principle of galvanic oxygen concentration cell (Nernst cell) with solid electrolyte

(Nernst's principle). The ceramic sensing element is a conductor of oxygen ions from a temperature of 350 C. A heater

is integrated on the sensing element. It is placed into the exhaust manifold. The sensing element compares the

residual oxygen content in the exhaust gas with the oxygen content in the reference atmosphere (air surrounding the

sensing element). This gives an output voltage between 100mV (lean exhaust gas) to 800mV (rich exhaust gas),

depending on whether the exhaust gas is lean or rich.

Preliminary Checks:

1) Loose/ Damaged Connections between Sensor and EMS ECU.

2) Check for back out of pins at both Sensor connector and ECU connector.

3) Check for damage of pins at both Sensor connector and ECU connector.

4) Check the continuity from Sensor connector pins to the ECU pins.

5) Check for Sensor poisoning / contamination.