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: 12 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.

P000A-26: “A” Camshaft Position Slow Response– Signal Rate of Change Below Threshold

Overview:

ISO Code

P000A-26

Customer Symptom

MIL turns ON.

Fault Effects (On Vehicle)

It will not effect drivability. Emission will get affected

1. RPM oscillation

2. Improper combustion

3. Manifold pressure will be affected which may leads to

throttle leakage

Lamp Status (If Any)

MIL ON after 3 drive cycle

Fault Detection Condition

This fault gets logged when there is an issue in, Inlet Variable

Valve Timing control slow response

Normal Operating Condition

When the signal rate is within threshold

Probable Trouble Area

1. Faulty oil control valve

2. Leakage in the oil gallery

3. Less quantity of oil

4. Less oil temperature

5. Miss alignment of camshaft

6. Wiring Harness connections, back out of pins,

7. Faulty ECU.

Healing Condition

After 3 drive cycles

Fault present 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 variable camshaft timing oil control solenoid is attached to camshaft and is hydraulically operated in order to

change the angle of the camshaft relative to crankshaft position. The variable camshaft timing oil control solenoid is

controlled by the EMS ECU. The EMS ECU sends a pulse width modulated 12 volt signal to a variable camshaft

timing oil control solenoid. The solenoid controls the amount of engine oil flow

Preliminary Checks:

1. Check oil control valve

2. Check leakage in the oil gallery

3. Check quantity of oil

4. Check oil temperature

5. Check alignment of camshaft

6. Check the continuity from Valve (IVVT) connector pins to the ECU pins.