P1590

DTC P1590: TCM to ECM Communication Error in Torque Reduction Request

TECHNICAL DESCRIPTIONS OF MONITOR METHODS
The ECM checks whether the errors in data communications sent by the TCM exist or not.

MONITOR EXECUTION
Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
- Not applicable

Sensor (The sensor below is determined to be normal)
- Not applicable

DTC SET CONDITIONS

Logic Flow Chart

Logic Flow Chart:

Check Condition
- Ignition switch is "ON" position.

Judgment Criterion
- ECM detects an error in communication between ECM and TCM.

FAIL-SAFE AND BACKUP FUNCTION
- Engine output is restricted.

OBD-II DRIVE CYCLE PATTERN
- None.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- CAN line harness damage or connector damage.
- ECM failed.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

STEP 1. Using scan tool MB991958, diagnose CAN bus line.







CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Diagnose CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line normal?

YES : Go to Step 2.

NO : Repair the CAN bus line. Refer to Can Bus Diagnostics Table. Can Bus Diagnostics Table

STEP 2. Using scan tool MB991958, read the diagnostic trouble code (DTC).

1. Turn the ignition switch to the "ON" position.
2. Read the DTC.
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC P1590 set?

YES : Replace the ECM. When the ECM is replaced, register the ID code.

NO : It can be assumed that this malfunction is intermittent.