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OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 599 of 654
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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: Vehicle Communication Bus A- Error Passive
Overview:
ISO Code
U1009
Customer Symptom
Check engine lamp will be ON
Fault Effects (On Vehicle)
Vehicle may not start
Lamp Status (If Any)
Check engine lamp will be ON ,
Fault Detection Condition
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
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