IG "OFF" and connect each channel scope to CAN-HIGH terminal and CAN-LOW terminal.
IG "ON" after disconnecting only PCM to CAN BUS.
IG "ON" after disconnecting only VDC ECU to CAN BUS.
IG "ON" after disconnecting only Instrument Cluster to CAN BUS.
Specification : At Ignition "ON", the waveform is same as the one of "Signal Waveform & Data".
Fig.1) Normal Waveform with ignition ON.
Monitoring CAN HIGH and LOW simultaneously is important in monitoring CAN communication waveform. When CAN HIGH signal rise to 3.5V and LOW signal drops to 1.5V - voltage difference between HIGH and LOW signal is 2V.
IG Key "OFF".
Measure resistance between Pin No. 77(CAN-High) and Pin No. 60(CAN-Low) terminals of data link connector (Measurement "A")
Disconnect PCM, Instrument Cluster, and BCM connector.
Measure resistance between Pin No. 77(CAN-High) and Pin No. 60(CAN-Low) terminals of data link connector (Measurement "B")
Specification :
PCM, Instrument Cluster and BCM connected : Approx. 60Ω (Measurement "A")
PCM disconnected : Approx. 120Ω (Measurement "B")
CAN waveform and resistance normal?
 | ▶ Go to "Verification of Vehicle Repair" procedure. |
 | ▶ Repair CAN BUS lines and go to "Verification of Vehicle Repair". |
