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: 232 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.

P0372: Crank Sensor Signal – Loss of Teeth

Overview:

DTC Description as per ISO standard

Timing Refer

ence High Resolution Signal “A” Too Few Pulses

ECU Pin Number

14, 15.

Customer Symptom

Engine vibrates at certain speeds.

After fault detection, Engine does not start

Fault Effects (On Vehicle)

Engine vibrates at certain speeds.

Once the fault is detected, Engine start will be disabled.

Lamp Status (If Any)

CE lamp is on

Fault Detection Condition

This DTC gets logged due to loss of missing tooth in the flywheel at the

expected place.

In other words, if two consecutive crank events (2 missing teeth) occur too

far from the previous one detected;

1. Noise signal in the crank sensor signal path

2. Under excessive engine declaration can cause the fault.

Normal Operating Condition

Diagnostic tool display the value of crank shaft sensor status at idling

Probable Trouble Area

Crankshaft sensor, ECU, Grounding points, Wiring harness

Healing Condition

Clear the errors, Ignition OFF to ON, engine idle condition

Component Details:

This is fitted on the crankcase and faces the phonic wheel on the flywheel. It is inductive type, i.e. its operation is

determined by magnetic field changes generated by the teeth passing in front of the phonic wheel. The changeover from

full to empty determined by the presence or absence of a gap brings about a magnetic flux change sufficient to generate

an induced alternating voltage proportional to the number of teeth on the ring (or phonic wheel). The frequency and

amplitude of the voltage send to the electronic control unit provides the latter with an indication of the engine angular

speed. The sensor output signal approximates a sine wave whose frequency is proportional to engine speed and

amplitude is approximately proportional to engine speed. Active edge is generated from zero crossing point positive to

negative transition.

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.

Visually check the sensor for damage etc.,

Check for metallic particles/burr in sensor tip and flywheel teeth; if noticed Clean the sensor tip and flywheel to

remove any foreign particle.

Ensure sensor is connected with the connector (wiring harness)

Visually check if the missing teeth on fly wheel is alright

Check gap between Crank sensor tip to Flywheel teeth; gap should be close to 1mm.