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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: 104 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.
Step Checks
IF YES
IF NO
1.
Read IVN DTCs in ECM. Is open circuit DTC in ECM in
current state?
1. Remove ECM
from vehicle wiring
harness.
2.Measure the
resistance between
following lines in
ECM vehicle side
wiring harness
1. CANH &CANL,
2. CANH & Ground ,
3. CANL & Battery,
4. CANH &Battery
5. CANL &Ground
Go to step 2.
Clear DTC.
2.
Is Resistance R < 10 ohm.
There is short circuit
failure in between
respective two
lines. Do necessary
repair in the
harness. Clear DTC.
Check the
resistance between
CANH and CANL
of ECM
connector in
vehicle wiring
harness.(with IPC
connected on
the vehicle).Go to
step 3.
3.
Check the resistance between CANH and CANL of ECM
connector in vehicle wiring harness.(with IPC connected on
the vehicle). Is resistance ≠ 120 ohm ?
Check the continuity
between
1. ECM CAN_H &
IPC CAN_H
2. ECM CAN_L &
IPC CAN_L
In vehicle side
connectors.
Do necessary repair
in the
Harness.
Go to step 4.
Clear DTC.
4.
If fault still persists.
then replace sensor
and if fault still
persists then call
Hotline.
Follow the above
procedure again for
Reconfirmation.
DTC’s confirmation
(checks before handing over vehicle to customer)
:
1. Check the errors at Ignition ON, engine running @ Idle & Fly-up with different vehicle speeds also.
2. If error present, then rectify the errors.
3. Confirm that there is no error logged in EMS before handing over vehicle to customer.