Aisin AY6 - Manual Transmission
DTC P0712 or P0713
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0712
-
Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage
DTC P0713
-
Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The transmission fluid temperature (TFT) sensor is a variable resistor that measures the temperature of the transmission fluid. The engine control module (ECM) supplies 5 V to the TFT signal circuit and supplies a ground to the low reference circuit.
The following table illustrates the difference between temperature, resistance, and voltage:
Conditions for Running the DTC
P0712
* The engine speed is above 1,000 RPM for 7 seconds.
* This DTC runs continuously when the above condition is met.
P0713
* The engine speed is above 1,000 RPM for 7 seconds.
* This DTC runs continuously when the above condition is met.
Conditions for Setting the DTC
P0712
The TFT is greater than 145°C (299°F) for more than 5 seconds.
P0713
The TFT is less than -35°C (-31°F) for more than 5 seconds.
Action Taken When the DTC Sets
DTC P0712 and P0713 are Type C DTCs.
Conditions for Clearing the MIL/DTC
DTC P0712 and P0713 are Type C DTCs.
Reference Information
Schematic Reference
Manual Transmission Schematics Aisin AY6 - Manual Transmission
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Transmission System Description and Operation Aisin AY6 - Manual Transmission
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Engine Control Module Scan Tool Information (LFX) Scan Tool Testing and ProceduresEngine Control Module Scan Tool Information (LS3/L99) Scan Tool Testing and ProceduresEngine Control Module Scan Tool Information (LSA) Scan Tool Testing and Procedures
Circuit/System Verification
1. Engine running, DTC P0712 or P0713 should not set.
2. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
Note:
You must perform the Circuit/System Verification first.
1. Ignition OFF, disconnect the harness connector at the B173 TFT sensor.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground.
• If greater than 5 ohms, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
3. Ignition ON, using a scan tool verify that the B173 TFT sensor parameter is at -40°C (-40°F).
• If greater than -40°C (-40°F), test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
Note:
If the signal circuit of the B173 TFT sensor is shorted to voltage the TFT sensor may be damaged.
4. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the B173 TFT sensor parameter is greater than 128°C (262°F).
• If less than 128°C (262°F), test the signal circuit of the B173 TFT sensor for a short to voltage or an open/high resistance. If the circuit test normal, replace the K20 ECM.
5. If all circuits test normal, replace the B173 TFT sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Transmission Fluid Temperature Sensor Replacement Aisin AY6 - Manual Transmission
* Engine Control Module Replacement Service and Repair
* Engine Control Module Programming and Setup (LFX) Testing and InspectionEngine Control Module Programming and Setup (LSA, LS3, L99) Testing and Inspection