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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: 103 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.
U1009-13: CAN Passive Failure
Overview:
DTC Description (User Friendly)
CAN Passive Failure
ECU Pin Number
K013 – CAN_H
K014 – CAN_L
A075 – Ignition
K001, K003, K005 – Supply voltage battery
K002, K004, K006 - Ground voltage battery
Customer Symptom
MIL OFF, CEL ON.Check engine lamp will be ON.
Fault Effects (On Vehicle)
Vehicle will not start.
Lamp Status (If Any)
CEL ON. CEL Turns Off as and when fault condition is not
present / healed.
Fault Detection Condition (Root cause)
1. Open circuit of CAN_H/ CAN_L/ both lines of
ECM ECU.
2. Short circuit between CAN_H - Vbatt, CAN_L –
GND of ECM ECU.
3.When CAN Passive Failure is detected.
Normal Operating Condition
ECM ECU communicates properly with other partner
ECUs in the CAN network.
Probable Trouble Area
CAN_H and CAN_L wires.
Healing Condition
1. Removal of the above mentioned shorts in the wiring
harness or at ECU pin.
2. Reconnecting CAN_H/ CAN_L/ both lines.
Component Details:
ECM ECU communicates properly with other partner ECUs in the CAN network.
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 in EMS ECU connector / Other ECU Connector.
4. Check for any back out of pins at EMS ECU connector / Other ECU Connector.
5. Check for any damage of pins at EMS ECU connector / Other ECU Connector.
Trouble Shooting: