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DTC P0746: Line Pressure Solenoid System (Drive current range out)


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

DIAGNOSTIC FUNCTION


TC-SST-ECU checks that the line pressure solenoid is normal.

DESCRIPTIONS OF MONITOR METHODS


The difference between the actual current of the line pressure solenoid and target current is large.

MONITOR EXECUTION



MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)


Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
Sensor (The sensor below is determined to be normal)

LOGIC FLOW CHARTS (Monitor Sequence) <Rationality - high>




DTC SET CONDITIONS


Check Conditions <Rationality-high>
JUDGMENT CRITERIA <Rationality-high>

OBD-II DRIVE CYCLE PATTERN <RATIONALITY-HIGH>


The value of the calculated current (actual current - target current) remains 500 mA or less for 1 second.

LOGIC FLOW CHARTS (Monitor Sequence) <Rationality - low>




DTC SET CONDITIONS


Check Conditions <Rationality-low>
JUDGMENT CRITERIA <Rationality-low>

OBD-II DRIVE CYCLE PATTERN <RATIONALITY-LOW>


The value of the calculated current (target current - actual current) remains 500 mA or less for 12 seconds.

PROBABLE CAUSES



DIAGNOSTIC PROCEDURE
Required Special Tools:
  • MB991958 Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle Communication Interface (V.C.I.)
    • MB991827 M.U.T.-III USB Cable
    • MB991910 M.U.T.-III Main Harness A

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .) After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Leave the engine idle for 15 seconds, and perform a test run of the vehicle. Then check that the DTC is reset.

Q. Is DTC No. P0746 set?
Replace the transaxle assembly. (Refer to .)
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)