DTC P1783 [AW6A-EL, AW6AX-EL]

id0502j7807700

DTC P1783

ATF high oil temperature malfunction

DETECTION CONDITION

•  The TCM detects ATF temperature of 150 °C {302 °F} or more when the TFT sensor circuit malfunction not stored.

Diagnostic support note:

•  The MIL does not illuminate.

•  The AT warning light does not illuminate.

•  The PENDING CODE is not available.

•  FREEZE FRAME DATA is not available.

•  The DTC is stored in the TCM memory.

POSSIBLE CAUSE

•  High engine load drive (Driving a steep gradient at a low speed.)

•  Insufficient or excess level of ATF

•  Deteriorated ATF

•  TFT sensor circuit malfunction

•  TCM malfunction

DTC P1783	ATF high oil temperature malfunction
DETECTION CONDITION	• The TCM detects ATF temperature of 150 °C {302 °F} or more when the TFT sensor circuit malfunction not stored. Diagnostic support note: • The MIL does not illuminate. • The AT warning light does not illuminate. • The PENDING CODE is not available. • FREEZE FRAME DATA is not available. • The DTC is stored in the TCM memory.
POSSIBLE CAUSE	• High engine load drive (Driving a steep gradient at a low speed.) • Insufficient or excess level of ATF • Deteriorated ATF • TFT sensor circuit malfunction • TCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	VERIFY VEHICLE DRIVING CONDITIONS • Verify vehicle driving conditions when a DTC P1783 is output according to the customer reports. • Has the vehicle been driven at a high engine load?	Yes	• Go to Step 5. • Inform the customer that the ATX temperature is high due to high engine load driving.
2		No	Go to the next step.
3	INSPECT ATF CONDITION • Switch the ignition to off. • Inspect the ATF condition. ― Clear red: Normal ― Milky: Water mixed in fluid ― Reddish brown: Deteriorated ATF • Is it normal? (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [AW6A-EL, AW6AX-EL].)	Yes	Go to the next step.
3		No	If the ATF color is milky or reddish brown, replace ATF, then go to Step 5. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [AW6A-EL, AW6AX-EL].)
4	INSPECT ATF LEVEL • Start the engine. • Warm up the ATX. • Is the ATF level within the specification? (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [AW6A-EL, AW6AX-EL].)	Yes	Go to the next step.
4		No	Add ATF to the specified level, then go to the next step. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [AW6A-EL, AW6AX-EL].)
5	VERIFY TROUBLESHOOTING OF DTC P1783 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from the memory using the M-MDS. • Start the engine. • Warm up the ATX. • Is the same DTC present?	Yes	Replace the TCM, then go to the next step. (See TCM REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
5		No	Go to the next step.
6	VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure”. (See AFTER REPAIR PROCEDURE [AW6A-EL, AW6AX-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [AW6A-EL, AW6AX-EL].)
6		No	DTC troubleshooting completed.