DTC U0164 A/C CAN timeout
caution
If DTC U0164 is stored, be sure to diagnose the CAN bus line.
When replacing the ECU, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
When the signal from the heater control unit or A/C-ECU cannot be received, OSS-ECU stores DTC U0164.
DTC SET CONDITION
Check Conditions
When all the following conditions are met.
Power supply mode: ON
ETACS-ECU system voltage is at 10 to 16 V.
Judgment Criterion
After the following condition is met, 2,500 ms or more have elapsed.
CAN signal from the heater control unit or A/C-ECU cannot be received.
TROUBLESHOOTING HINTS
Malfunction of the CAN bus line
Malfunction of heater control unit or A/C-ECU
Malfunction of heater control unit or A/C-ECU power supply circuit
Malfunction of OSS-ECU
DIAGNOSIS
1.
Using scan tool (M.U.T.-III), diagnose the CAN bus line.
2.
ETACS-ECU diagnostic trouble code check
3.
OSS-ECU diagnostic trouble code recheck