P1593 is set when ECM is recognized as 1)4WD but CAN communication signal is not transmitted from 4WD ECU 2)2WD but CAN communication signal is transmitted from 4WD ECU. After checking if 4WD auto recognition terminal is correct for each vehicle option, if no problem is detected, check poor connection in CAN communication circuit or CAN communication problem of 4WD ECU.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Signal monitoring | 1. 4WD recognition terminal circuit 2. CAN communication line 3. 4WD component failure 4. ECM component failure | ||
Enable Conditions |
•
IG key ON | |||
Threshold value |
•
TCM signal is not detected at A/T vehicle
•
TCM signal is detected at M/T vehicle | |||
Diagnosis Time |
•
1sec. | |||
Fail Safe | Fuel cut | NO |
•
- | |
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | OFF | |||
