P2536

DTC P2536

Diagnostic Instructions

* Perform theDiagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptor
DTC P2536
- Ignition Accessory Switch Circuit




Circuit/System Description

The transmission control module (TCM) will wakeup from sleep mode when a voltage greater than 5 V is detected on the switched ignition input or accessory/wakeup input. The Body Control Module (BCM) provides voltage to the TCM accessory/wakeup input. After wakeup, the TCM will not go into sleep mode until the accessory/wakeup input and ignition input are less than 5 V.


Conditions for Running the DTC

* Battery voltage is greater than 9 V and less than 18 V.
* Ignition voltage is greater than 5 V.
* Engine speed is greater than 200 RPM for 5 seconds.



Conditions for Setting the DTC

This DTC sets when the accessory/wakeup is not active for 60 seconds.


Action Taken When the DTC Sets

* The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL).
* DTC P2536 is stored in TCM history.



Conditions for Clearing the DTC

DTC P2536 is a Type C DTC.


Diagnostic Aids

You may have to drive the vehicle in order to experience a condition.


Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System Description)
* Electronic Component Description (Electronic Component Description)

Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

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

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


Circuit/System Verification

1. Ignition ACCESSORY, verify that a scan tool can communicate with the TCM.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.



Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the TCM.
2. Ignition ACCESSORY, test for greater than 5 V on the signal circuit between the TCM harness connector terminal 43 and ground.

• If less than the specified value, test signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the BCM.

3. If the signal circuit tests normal, replace the TCM.



Repair Instructions

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

* Wiring Harness Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for TCM replacement, setup, and programming



Repair Verification

If another DTC is present, refer toDiagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions) and perform the appropriate diagnostic procedure.