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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: 332 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.
P0704: Clutch Pedal Position Sensor fault
Overview:
DTC Description as per ISO standard
Clutch Switch Input Circuit
ECU Pin Number
17, 50
Customer Symptom
EGR will be disabled which will lead to more emissions (NoX)
Fault Effects (On Vehicle)
Disables EGR by setting desired rate to 0. This will affect
EGRH rate, EGRL rate, Throttle, Intake manifold pressure and boost
pressure.
Lamp Status (If Any)
CE lamp is on
Fault Detection Condition
This fault gets logged if the EMS ecu doesn't detects any clutch transitions
though the vehicle speed has crossed a maximum calibrated threshold (70
kmph)
Normal Operating Condition
Press the clutch pedal and observe the Vehicle parameter clutch state in
Diagnostic tool.
Probable Trouble Area
Clutch sensor, ECU, Grounding points, Wiring harness
Component Details:
Clutch position sensor is a hall effect based sensor which provides two digital inputs to EMS ecu. First input is top travel
input
–
which implies clutch pedal is pressed 40% another input is Clutch bottom travel input
–
which implies clutch pedal
is pressed 90%.
Clutch 40% input will be used for Vehicle drivability refinements and Clutch 90% input will be used for Vehicle start, CGD
and GSI functions.
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 whether the clutch pedal connector is connected or not. Refit the connector tightly.
x
Check the clutch sensor gap between the Sensor Magnet and pedal as per the Sensor mounting specification and
if deviations found then perform the necessary repairs.
x
Check whether the Clutch sensor is getting power supply at its Pin 1.
x
Read the Clutch State parameter in Diagnostic tool:
d) When pedal is not pressed
–
Clutch Engaged
e) When Pedal is partially pressed
–
Clutch Disengaged
f) When the pedal is fully pressed
–
Clutch Fully disengaged