Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P1761: Up and Down Shift Switch Signal CircuitCircuit/System Description
The controller area network (CAN) serial data bus is used by the body control module (BCM) and automatic transmission control module (TCM) to share information. This diagnostic applies to an invalid CAN signal.
Conditions for Running the DTC
The engine is running for at least 2 seconds.
Conditions for Setting the DTC
An error in the BCM Tap-up, Tap-down Signal Circuit count.
Action Taken When the DTC Sets
The TCM disables TAP shift operation.
Conditions for Clearing the DTC
DTC P1761 is a Type C DTC.
Diagnostic Aids
A BCM error is the only condition that will set this DTC.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Description and Operation
Body Control System Description and Operation
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
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 observe from the Freeze Frame/Failure Records data.
| ⇒ | If DTC resets replace BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming.
