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: 36 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.

P029C: Insufficient Updates are performed on 1st Cylinder Injector

Overview:

DTC Description as per ISO standard

Cylinder 1

–

Injector Restricted

ECU Pin Number

Customer Symptom

Engine may have abnormal noise and vibrations.

Power Loss

Fault Effects (On Vehicle)

Reduced torque mode is activated.

Improper Injections in Cylinder 1.

Lamp Status (If Any)

CE lamp is on

Fault Detection Condition (Root cause)

This DTC is logged when 1st cylinder injector MDP (Minimum Drive

Pulse) updates are done insufficiently due to the strategy fails too often or

due to the conditions which are not met for the strategy to Operate.

Normal Operating Condition

No MDP related failures / faults detected

Probable Trouble Area

Conditions are not meeting for performing SPC learning of Injectors by

ECU.

Healing Condition

Clear the errors, Ignition OFF to ON, engine idle & fly-up condition

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.

Check faults related to SPC / SPCI disable: P0115, P0112, P0113, P1171, P1172, P1173, P1174, P0237, P0238,

P1235, P1236, P0263, P0272, P0266, P0269, P0201, P0202, P0203, P0204, P1201, P1202, P1203, P1204,

P0192, P0193, P0191, P0194, P0500. If present, rectify them by following their rectification procedure.

Check Injector Connection; Switch ignition off and wait for ten seconds. Remove injector connector; clean and

reconnect properly.