Aisin 81-40LE - Automatic Transmission

DTC P0602

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 Descriptor
DTC P0602
- Control Module Not Programmed

Circuit/System Description

This is an internal fault detection of the transmission control module (TCM). This fault is handled inside the TCM and no external circuits are involved.

Conditions for Running the DTC

* The ignition is ON.
* The TCM runs the diagnostic software once an ignition cycle.

Conditions for Setting the DTC

* The TCM detects that there is no software data written in the fixed address in the calibration area.
* The controller is identified as a service replacement TCM.

Action Taken When the DTC Sets

* The TCM will request the illumination of Blink/Hold Lamp and store the DTC when the TCM detects a failure on the first consecutive ignition cycle.
* DTC P0602 is a type C1 DTC.

Conditions for Clearing the DTC

* The TCM turns off the Blink/Hold Lamp when no further failures are detected on the next ignition cycle.
* The scan tool can clear the DTC from the TCM history.
* The TCM clears the DTC from the TCM history memory after 40 consecutive ignition cycles without fault.

Reference Information
Description and Operation

Electronic Component Description (Electronic Component Description)
DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, clear the DTC information with a scan tool. Observe the scan tool DTC information. Verify that DTCs P0602 does not fail this ignition cycle.

If DTC P0602 failed this ignition, reprogram the TCM. Refer to Control Module References (Programming and Relearning). If DTC P0602 resets, replace the TCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Refer to Control Module References (Programming and Relearning) for TCM replacement, setup, and programming.