锟斤拷If both MTS values were not at or near 200锟斤拷C (392锟斤拷F), test the MTS signal circuit for a low resistance to ground condition.
锟斤拷If the circuit tests normal, replace the motor temperature sensor.
3. Inspect the transmission cooling system for restrictions or damage.
锟斤拷If a concern is found, repair or replace the restricted or damaged components as necessary.
4. Perform the Transmission Fluid Cooler Flushing and Flow Test (J 45096) (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Testing and Inspection/Symptom Related Diagnostic Procedures/2ML70 - Automatic Transmission/Transmission
Fluid Cooler Flushing and Flow Test (J 45096)).
锟斤拷If a concern is found, repair or replace the damaged components as necessary.
5. Perform the automatic transmission Line Pressure Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and
Inspection/Component Tests and General Diagnostics/2ML70 - Automatic Transmission/Line Pressure Check).
锟斤拷If a concern is found repair or replace the damaged components as necessary.
Component Testing
* Perform the Fluid Leak Diagnosis (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component
Tests and General Diagnostics/2ML70 - Automatic Transmission/Fluid Leak Diagnosis).
* Perform the Transmission Fluid Level and Condition Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing
and Inspection/Symptom Related Diagnostic Procedures/2ML70 - Automatic Transmission/Transmission Fluid Level and Condition Check)
procedure.
* Perform the Line Pressure Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component
Tests and General Diagnostics/2ML70 - Automatic Transmission/Line Pressure Check) procedure.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Drive Motor with Generator Assembly Removal - 2nd Position (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/13. Drive Motor with Generator Assembly Removal
- 2nd Position).
* Transmission Control Wiring Harness Extension Harness Removal (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/5. Transmission Control Wiring Harness Extension
Harness Removal).
P0A40
DTC P0A40
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0A40
- Drive Motor 1 Position Sensor Performance
Diagnostic Fault Information
