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OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 220 of 654
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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.
P0340: Cam Sensor Signal Loss Fault
Overview:
DTC Description as per ISO
standard
Camshaft
Position Sensor “A” Circuit
ECU Pin Number
34
Customer Symptom
Engine does not start.
Fault Effects (On Vehicle)
Open circuit on Cam sensor connector.
If there is no cam flank / movement for crank rotation
Lamp Status (If Any)
CE lamp is on
Fault Detection Condition
This DTC gets logged If the ECU does not detect the cam signal pulse
events.
Normal Operating Condition
Diagnostic tool display the value of cam sensor status at idling
Probable Trouble Area
Cam shaft sensor, ECU, Grounding points, Wiring harness
Healing Condition
Clear the errors, Ignition OFF to ON
Component Details:
A typical Hall Effect Sensor has three wires or terminals: one for ground, one for supply or reference voltage and one for
the output signal. To produce an output signal, a Hall Effect Sensor must be supplied with a reference voltage. When a
metal/wheel passes through the air gap between the magnetic field (Magnet) and silicon chip (CAM sensor), it blocks the
magnetic field and causes the chip’s output voltage to suddenly drop to zero else the chip's output voltage is 4.7 Volts.
Preliminary Checks:
x
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.
x
Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to
earlier issue closure.
x
Loose/ Damaged Connections between Sensor and EMS ecu.
x
Check for back out of pins at both Sensor connector and ECU connector.
x
Check for damage of pins at both sensor connector and ECU connector.
x
Check the continuity from sensor connector pins to the ECU pins.
x
Physical damage to Cam target wheel.
x
Improper Air Gap between Sensor and Cam target wheel.