HARRIER BOOK 2

Q501 4 Cylinder MT Application

DTC Troubleshooting Data

Version: 0.1

Date: 21-Sep-2018

Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta

Checked By: Yogesh Jadhav

Approved By: Satish Kumar P

Page: 796 of 1052

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.

P0335-31: Crank Shaft Position Sensor “A” Circuit – Engine speed sensor general electrical failure

Overview:

DTC Description (User Friendly)

Engine speed sensor general electrical failure

ECU Pin Number

A020, A021

Customer Symptom

Engine possibly will not start, MIL ON

Fault Effects (On Vehicle)

Engine possibly will not start.

Lamp Status (If Any)

MIL ON

Fault Detection Condition (Root cause)

The engine is rotating but there is no crankshaft signal

detectable. On the other hand the camshaft signal has been

checked and it is plausible. The counter of camshaft rotation

without crankshaft signal is checked every 100ms and

reaches threshold (Value - 2)

Normal Operating Condition

No Fault

Probable Trouble Area

Crank Shaft sensor wiring connections with EMS ECU.

Connector of Crank shaft sensor.

Crank Shaft Sensor

EMS ECU faulty

Healing Condition

Rectify the error

Clear through diagnostic tool

Ignition OFF & ON

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:

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

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

2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with

respect to earlier issue closure.

3. Loose/ Damaged Connections between Crank shaft Sensor and EMS ECU.

4. Check for damage / back out of pins at ECU connector.

5. Check for damage / back out of pins at crank shaft sensor’s connector.

Trouble Shooting:

Step Checks

IF YES

IF NO

Is there wiring harness electrical continuity between ECU

pin A020 & Crank Shaft sensor pin 1, ECU pin A021 and

Go to next step

Rectify the wiring

harness