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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: 962 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.
P2031-64: Exhaust Gas Temperature Sensor Circuit Bank1 sensor 2 – Oxidation catalyst upstream temperature
signal plausibility
Overview:
DTC Description (User Friendly)
Oxidation catalyst upstream temperature signal plausibility
ECU Pin Number
A056, A055
Customer Symptom
MIL ON, CEL OFF. Torque Loss
Fault Effects (On Vehicle)
Torque Loss, DPF Regen Off.
Lamp Status (If Any)
MIL ON, CEL OFF
Fault Detection Condition (Root cause)
The temperature of sensor at Exhaust gas temperature sensor
(Inlet catalyst – T4 Sensor) position is compared with all other
temperature values (T3, T5, T6 temperature sensor values) and if
the value is showing non plausibility with all other sensor. Then
the corresponding DTC is Set.
Normal Operating Condition
No fault
Probable Trouble Area
Wiring Harness connections between the T4 sensor and EMS
ECU
Exhaust gas temperature sensor (Inlet catalyst – T4 Sensor)
EMS ECU
Healing Condition
Rectify the error
Clear through diagnostic tool
Ignition OFF & ON
Component Details:
The Inlet Cat. sensor is based on a PTC sensitive element, placed inside the sensor body; the resistance
decreases/increase as the air temperature increases, according to its specific characteristics. The PTC resistance value,
in combination with ECU interface, gives an output voltage proportional to temperature changes.
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 damage of pins / back out of pins at ECU connector / Exhaust gas temperature sensor (Inlet catalyst –
T4 Sensor) connector. If found, rectify.
4. Check the wiring harness connections between the Exhaust gas temperature sensor (Inlet catalyst – T4 Sensor)
and EMS ECU.
Trouble Shooting:
Step Checks
IF YES
IF NO
1
Check the Electrical Continuity between the Exhaust gas
temperature sensor (Inlet catalyst – T4 Sensor) and EMS
ECU. For pin details, refer schematic section below.
Go to next step
Rectify the wiring
harness
connections as per
the circuit