Steps For Resistance Check in CAN Wiring
Disconnect the Battery before measuring the resistance values
All the ECUs to be connected while checking the resistance values
Recommend device: Multimeter
Measure Resistance across the OBD connector
OBD Connector details
1) Pin No.6 : CAN_H
2) Pin No.14: CAN_L
3) Pin No.4,5: GND
4) Pin No 16: +ve
S. No.
CAN_H and CAN_L CAN_H and GND CAN_L and GND CAN_H and +ve CAN_L and +ve
Status Value Status Value Status Value Status Value Status Value
1 EMS & IC Present 60Ώ
Both ECU's
Present
---
Both ECU's
Present
---
Both ECU's
Present
---
Both ECU's
Present
---
2
Either EMS or IC Not
Present
120Ώ IC/EMS --- IC/EMS --- IC/EMS --- IC/EMS ---
3
Both EMS & IC Not
Present
>1KΏ
Both ECU's Not
Present
---
Both ECU's Not
Present
---
Both ECU's Not
Present
---
Both ECU's Not
Present
---
4
CAN_H and CAN_L
Short
0Ώ
CAN_H and
CAN_L Short
---
CAN_H and
CAN_L Short
---
CAN_H and
CAN_L Short
---
CAN_H and
CAN_L Short
---
5
CAN_H and +ve
Short
60Ώ
*
CAN_H and +ve
Short
---
CAN_H and +ve
Short
---
CAN_H and +ve
Short
0Ώ
CAN_H and +ve
Short
60Ώ
*
6 CAN_L and +ve Short
60Ώ
*
CAN_L and +ve
Short
---
CAN_L and +ve
Short
---
CAN_L and +ve
Short
60Ώ
*
CAN_L and +ve
Short
0Ώ
7
CAN_H and GND
Short
60Ώ
*
CAN_H and GND
Short
0Ώ
CAN_H and GND
Short
60Ώ
*
CAN_H and GND
Short
---
CAN_H and GND
Short
---
8
CAN_L and GND
Short
60Ώ
*
CAN_L and GND
Short
60Ώ
*
CAN_L and GND
Short
0Ώ
CAN_L and GND
Short
---
CAN_L and GND
Short
---
* The value changes to 120Ώ if either EMS or IC is not present in the network
After resistance measurement, connect Diagnostic tool to read the DTCs present in the network
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