CAN Communication Line Inspection: Notes

■ Inspection procedure for resistance measurement 

When measuring resistance, it is generally necessary to disconnect the circuit being tested from the power supply before hand. The vehicle's battery should therefore be disconnected and wait about four minutes to allow all capacitors in the system to discharge.

Inspection procedure for resistance test:

1. The CAN bus must be disconnected from the power supply.
2. The measurement is taken between the CAN High and CAN Low leads.
3. The measurement recorded may differ from the specified levels by a few ohms.

■ Resistance measurement with matching resistor 

1. Ignition "OFF" and disconnect the battery and wait about four minutes.
2. Make sure all modules are properly connected.
3. Measure resistance between Pin No. 3 (C-CAN High) and Pin No. 11 (C-CAN Low) terminal of Data Link Connector harness connector.

   Specification:  Approx. 60 Ω

4. Is the measured value within specification?

   YES 

   • Go to "CAN SIGNAL INSPECTION " procedure.

   NO 

   • If the value is out of specification then, go to "CAN Resistor Inspection" procedure below.

     If the measured value is approx. 0Ω, then check for short CAN communication line.

     If the measured value is approx. ∞Ω, then check for open CAN communication line.