P1765
DTC P1765-P1767
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 P1765
-
Upshift Switch 2 Circuit
DTC P1766
-
Downshift Switch 2 Circuit
DTC P1767
-
Up and Down Shift Switch 2 Circuit
Diagnostic Fault Information
Circuit/System Description
The drivers shift control (DSC) also known as the Tap UP/Down feature allows the driver to shift or change gears similar to a manual transmission. Activating the DSC is accomplished by placing the shift lever in the manual (M) mode position. To place the shift lever in M position, move the shift lever to the right from the drive (D) position gate. When the shift lever is in the M position an upshift is accomplished pushing the shift lever forward. A downshift is accomplished by pulling back or pushing rearward on the shift lever. A redundant set of Tap UP/Down switches are available on the steering wheel horizontal crossbar facing the instrument panel. The plus (+) switch is located on the right side of the steering wheel and the minus (-) switch is located on the left side of the steering wheel. A 12 volt parallel circuit from the body control module (BCM) supplies voltage to the automatic transmission manual shift switch on the shift lever and to the automatic transmission manual shift switches on the steering wheel. A separate signal circuit from each switch to the BCM provides the information on each Tap Up/Down command. The BCM sends the requested command on the serial data line to the transmission control module (TCM) to perform the shift.
Conditions for Running the DTC
P1765, P1766, or P1767
* DTCs P1761, P1765, P1766, P1767, P182E, and P1915 are not set.
* Ignition voltage is greater than 8.6 volts.
* The engine speed is greater than 500 RPM for 5 seconds.
Conditions for Setting the DTC
P1765
The TCM detects a Stuck ON tap up switch for 1 second in PARK, NEUTRAL, and in manual position for 600 seconds, when the tap down switch is depressed.
P1766
The TCM detects a Stuck ON tap down switch for 1 second in PARK, NEUTRAL, and in manual position for 600 seconds when the tap up switch is depressed.
P1767
The TCM detects an invalid voltage on the TAP Up/Down Signal Circuit for 1 minute.
Action Taken When the DTC Sets
* DTCs P1765, P1766, and P1767 are Type C DTCs.
* The TCM disables TAP shift functions.
Conditions for Clearing the DTC
DTCs P1765, P1766, and P1767 are Type C DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views A/C Compressor Clutch
* Inline Harness Connector End Views X101
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
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Engine running, park brake applied, drive wheels chocked. Shift the transmission into the manual (M) position. Verify with a scan tool the following TCM parameters display the correct values:
* Drivers Shift Control - Inactive
* Drivers Shift Request - None
• If the TCM parameters are incorrect
Refer to Circuit/System Testing below.
• If the TCM parameters are correct
2. Verify with a scan tool the following TCM parameters display the correct values when pressing the automatic transmission manual shift switch-right:
* Drivers Shift Control - Active
* Drivers Shift Request - Upshift
• If the TCM parameters are incorrect
Refer to Circuit/System Testing below.
• If the TCM parameters are correct
3. Verify with a scan tool the following TCM parameters display the correct values when pressing the automatic transmission manual shift switch-left:
* Drivers Shift Control - Active
* Drivers Shift Request - Downshift
• If the TCM parameters are incorrect
Refer to Circuit/System Testing below.
• If the TCM parameters are correct
4. 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 that you observed 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
1. Ignition OFF, disconnect the automatic transmission manual shift switch left and right wire harness connector.
2. Ignition ON, test for 11-13 volts on terminal 2 on both the automatic transmission manual shift switch left and right harness connectors and ground.
• If not within the specified value
Test the voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
• If within the specified value
3. Ignition OFF, test for infinite resistance between terminal 1 and terminal 2 on the automatic transmission manual shift switch-right, with the switch open.
• If not within the specified value
Replace the automatic transmission manual shift switch-right
• If within the specified value
4. Ignition OFF, test for 1.20-1.50 k ohms between terminal 1 and terminal 2 on the automatic transmission manual shift switch-right, with the switch closed.
• If not within the specified value
Replace the automatic transmission manual shift switch-right.
• If within the specified value
5. Ignition OFF, test for infinite resistance between terminal 1 and terminal 2 on the automatic transmission manual shift switch-left, with the switch open.
• If not within the specified value
Replace the automatic transmission manual shift switch-right.
• If within the specified value
6. Ignition OFF, test for 1.50-1.80 k ohms between terminal 1 and terminal 2 on the automatic transmission manual shift switch-left, with the switch closed.
• If not within the specified value
Replace the automatic transmission manual shift switch-left.
• If within the specified value
7. Ignition OFF, connect a 3A fused jumper wire between terminal 1 and terminal 2 on the automatic transmission manual shift switch-left harness connector.
8. Ignition ON, test for 11-13 volts on the BCM connector X1 terminal 7 and ground.
• If not within the specified range
Test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Refer to Manual Shift Auxiliary Position Switch Replacement - Steering Wheel Manual Shift Auxiliary Position Switch Replacement - Steering Wheel.
* Refer to Control Module References Control Module References for body control module replacement, programming, and setup.