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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: 606 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.
4. Check for electrical continuity between ECU & AMF connector with respect to circuit schematic and rectify
electrical dis-continuity if noticed.
5. Check inlet air circuit for clogging; wrong assembly/fitment / leakages etc; clean the inlet air circuit and remove
any clogging and remove leakage paths.
6. Check for any leakages in EGR system airflow path. Rectify if any leakages found.
Trouble Shooting:
Step Checks
IF YES
IF NO
1.
Check for any other faults presence related to ECU Internal
power supplies.
Follow rectification
process for the
faults, before
proceeding further
Go to Step 2
2.
Check for electrical continuity between ECU to AMF
connector as per circuit schematic
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the circuit
schematic
3.
Are there any pins damaged at EMS ECU Connector or
AMF Sensor connector?
Replace the
connector or wiring
harness
Go to step 4
4
Are there any pins backed out from the EMS ECU
Connector or AMF sensor connector?
Rectify/Replace
Connectors
Go to Step 5
5
Check inlet air circuit for clogging and leakages in air path;
wrong assembly/fitment etc; Any issues found?
Clean the inlet air
circuit and remove
any clogging.
Rectify the leakages
Go to Step 6
6
Check whether the EMS ECU pin number K086 and K076
are open circuited (MAF Sensor pin 3 and ECM pin K076
or MAF sensor pin 2 and K086)
Rectify the wiring
harness.
Go to Step 7
7
Check for High resistance / Open circuit in MAF sensor
supply circuit (MAF Sensor pin 1 and Supply)
Rectify the wiring
harness.
Go to Step 8
8
Check for High resistance / Open circuit in MAF sensor
ground circuit (MAF sensor pin 2 and ECM pin K087)
Rectify the wiring
harness.
Go to Step 9
9
Fault Persists.
Replace AMF / MAF
Sensor
*1
. If Fault
persists then Call
Hot line.
Follow the steps
again for
reconfirmation
Note
*1
: In case of AMF Sensor Replacement. Below Routine to be executed
“Reset Lambda sensor - 4.2.2 ‘Exchange of Injectors, Rail Pressure Sensor and MAF Sensor’ (LSU1 $
02 05 XX
)
– Sub-function
02“.
DTC’s confirmation:
After rectification, Test Drive the vehicle for 2 KM and ensure that no DTC’s are logged in ECM.