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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: 950 of 1052
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.
P1579-53: Cruise control reversible disabling (event information)
Overview:
DTC Description (User Friendly)
Cruise control reversible disabling (event information)
ECU Pin Number
K035, K010
Customer Symptom
MIL OFF, CEL OFF. Cruise control will get inactive
Fault Effects (On Vehicle)
Cruise Control will get inactive
Lamp Status (If Any)
-
Fault Detection Condition (Root cause)
This fault gets detected if Brake Switch fault (0/1 plausibility – P0571-
94) is detected when Cruise active.
Normal Operating Condition
No Fault
Probable Trouble Area
Wiring harness connections between Brake switch and EMS ECU.
Brake switches.
EMS ECU faulty.
Healing Condition
Rectify the error
Clear through diagnostic tool
Ignition OFF & ON
Component / Function Details:
EMS ECU controls the Vehicle Speed to the User Set cruise speed provided other pre-conditions be satisfied. User has
got the Cruise switch interface on Steering wheel to Enable the function, Set / Resume cruise target speed and cancel
cruise.
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. Check for wiring harness dis-continuity between the Brake Switch and EMS ECU.
4. Check whether P0571-94 fault is logged, rectify this fault by following its rectification procedure.
5. Check for damage of pins at ECU connector.
Trouble Shooting:
Step Checks
IF YES
IF NO
1
Check whether P0571-94 / P0703-94 fault is also logged?
Rectify the fault by
following its
rectification
procedure
Go to next step
2
Check whether the Brake pedal switch is dis-connected
and Vehicle is operated with cruise active and user tried to
de-activate cruise by brake press.
Refit the Brake
switch connector.
Go to next step
3
Check for any wiring harness dis-continuity between the
Brake switch connector and EMS ECU. Dis-continuity
found ?
Rectify the wiring
harness connections
as per the circuit
schematic
Go to next step
4
Fault Persists.
Call Hotline
Repeat the above
steps for re-