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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: 228 of 654
Copyright ©
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.
P0371: Crank Sensor Signal - Too Early
Overview:
DTC Description as per ISO standard
Timing Reference High Resolution Signal “A” Too Many 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 too many pulses from the crank sensor. In
other words, if two consecutive crankshaft events (i.e. 2 missing teeth) are
too close to the previous one detected
- Noise signal in the crank sensor signal path
- Excessive engine acceleration.
Normal engine acceleration is taken in to account before raising this fault.
Numbers of early events (3) are monitored per gap cycle before raising 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
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
Check crank sensor to flywheel air gap to be between 0.7 to 1.3 mm, Ensure correct air gap.
x
Check sensor connections for rust dirt etc, if noticed ensure clean connector pins and proper fitment.
x
Check crank shaft teeth and cam shaft gear hole; Replace sensor/component (flywheel/cam gear/cam shaft) if
found faulty.