DTC P1783 [FS5A-EL]

id050221807700

DTC P1783

ATF high oil temperature malfunction

DETECTION CONDITION

• When all conditions below are satisfied.
- P0712, P0713 not output
- ATF temperature 149.5 °C {301°F} or more
- ATF oil temperature signal of 0.06 V or more is input to TCM terminal 2H.
Diagnostic support note:
• This is a continuous monitor (CCM).
• The MIL does not illuminate if the TCM detects above malfunction conditions during the first drive cycle.
• The PENDING CODE is not available.
• FREEZE FRAME DATA is not available.
• The AT warning light illuminates.
• 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 FREEZE FRAME DATA HAS BEEN RECORDED

• Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• Verify related Service Bulletins and/or on-line repair 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.
No
Go to the next step.
3

VERIFY VEHICLE DRIVING CONDITIONS

• Verify each PID monitor of the HTM_CNT and HTM_DIS.
• Verify vehicle driving conditions when a DTC P1783 is output.
• Has the vehicle been driven at a high engine load?
Yes
• Go to Step 6.
• Inform the customer that the ATX temperature is high due to high engine load driving.
No
Go to the next step.
4

INSPECT ATF CONDITION

• Turn the ignition switch to the LOCK position.
• Inspect the ATF condition.
- Clear red: Normal
- Milky: Water mixed in fluid
- Reddish brown: Deteriorated ATF
• Is it normal?
Yes
Go to the next step.
No
If the ATF color is milky or reddish brown, replace ATF, then go to Step 6.
5

INSPECT ATF LEVEL

• Start the engine.
• Warm up the ATX.
• Is the ATF level within the specification?
Yes
Go to the next step.
No
Add ATF to the specified level, then go to the next step.
6

VERIFY TROUBLESHOOTING OF DTC P1783 COMPLETED

• Make sure to reconnect all the disconnected connectors.
• Clear the DTC from the memory using the WDS or equivalent.
• Start the engine.
• Warm up the ATX.
• Is the PENDING CODE present?
Yes
Replace the TCM, then go to the next step.
No
Go to the next step.
7

VERIFY AFTER REPAIR PROCEDURE

• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.