Code No. P1590: A/T-ECU to Engine-ECU Communication Error in Torque Reduction Request
FUNCTION
The engine-ECU watches and checks whether communication with the A/T-ECU normal or not.
TROUBLE JUDGEMENT
Check Condition
Ignition switch is "ON" position.
Judgement Criterion
Engine-ECU detects an error in communication between engine-ECU and A/T-ECU.
FAIL-SAFE AND BACKUP FUNCTION
Engine output is restricted.
PROBABLE CAUSE
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Reconfirmation of diagnosis code.
Q. Is diagnosis code set?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions
).