NEXON DIAGNOSTIC MANUAL

OSPREY- Application

DTC Troubleshooting Data

Version: 4.0

Date: 10-02-2017

Prepared by: Mithipati Prasad

Checked by: G S Raju / Senthilnathan S

Page: 347 of 654

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.

P1171: Incorrect MDP Updated in Cylinder 1 Injector

Overview:

DTC Description as per ISO standard

Minimum Drive Pulse too short (Cylinder 1)

ECU Pin Number

Customer Symptom

Engine restricted performance

Engine may have abnormal noise or vibrations.

Fault Effects (On Vehicle)

Disables RPC trim fault detection.

Disables post and pilot injections

Speed pilot control strategy will be disabled

Lamp Status (If Any)

CE lamp is on

Fault Detection Condition

This DTC gets logged if the I3C value is not written for Injector cylinder 1 or

any other fault has got logged which has disabled SPC learning

Normal Operating Condition

No faults related to Minimum Drive Pulse (MDP)

Probable Trouble Area

Injector Bank, Injector I3C write not done, Injector SPC Learning, EMS

ECU, Grounding points, Wiring harness

Component Details:

The function of the fuel injection system is to provide the right amount of fuel at the right moment and in a suitable

condition for the combustion process. There must therefore be some form of measured fuel supply, a means of timing the

delivery and the atomization of the fuel.

Injector has two basic parts, the nozzle and the nozzle holder or body. When EMS energizes the injector solenoid, the

high-pressure fuel enters and travels down a passage in the body and then into a passage in the nozzle, ending finally in

a chamber surrounding the needle valve.

The needle valve will open when the fuel pressure acting on the needle valve tapered face exerts a sufficient force to

overcome the spring compression. The fuel then flows into a lower chamber and is forced out through a series of tiny

holes. The small holes are sized and arranged to atomize, or break into tiny drops, all of the fuel oil, which will then readily

burn. Once the EMS turns off the injection pulse, needle valve will shut quickly under the spring compression force.

Preliminary Checks

Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If

yes, go ahead with next steps. If not, check for other DTC’s presence.

Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to

earlier issue closure.

Cross check I3C values of Injector 1 (20-digit alpha numeric value printed on the injector) against I3C value feed

fed in the ECU.

If these two values don't match then, feed the correct I3C values (20-digit alpha numeric value printed on the

injector) of injector 1 in the ECU.

Key off and wait for 30 sec and key on, check for reappearance of the DTC.