• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Tap Up/Tap Down Switch Signal Circuit | 0 V | 0 V | 5-12 V | -- |
The drivers shift request (DSR), also known as the TAP Shift, allows the driver to manually shift gears by pressing the plus (+) or minus (-) buttons and select the desired range of gears for current driving conditions by using the DSR shift switch located on the automatic transmission gear shift lever. Pushing the plus (+) switch will command an upshift and pushing the minus (-) switch will command a downshift. A 12 V reference voltage flows from the body control module (BCM) through the DSR switch resistor array to the BCM. The DSR shift system is activated when the gear selector is in the Manual (M) position. The DSR system is deactivated in all other range positions.
The engine speed is between 200-7500 RPM for at least 5 seconds.
• | No DTCs P0826 or P0708. |
• | The time since the last gear selector range change is greater than 6 seconds. |
The BCM detects an upshift request for 3 seconds in PARK, REVERSE, NEUTRAL, or D1 and for 600 seconds in PARK, REVERSE, NEUTRAL, D2, or D1.
The BCM detects a downshift request for 3 seconds in PARK, REVERSE, NEUTRAL, or D1 and for 600 seconds in PARK, REVERSE, NEUTRAL, D2, or D1.
The BCM detects an invalid voltage on the TAP up/down signal circuit for 5 seconds.
• | DTCs P0815, P0816, P0826, and P1876 are Type C DTCs. |
• | The BCM disables TAP shift operation. |
DTCs P0815, P0816, P0826, and P1876 are Type C DTCs.
Automatic Transmission Controls Schematics
• | Circuit Testing |
• | Wiring Repairs |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If not the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | If less than the specified value, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If not within the specified values, replace the automatic transmission lever. |
⇒ | If the specified values are normal, test the signal circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Shift Lever Replacement for RSM shift switch replacement. |
• | Control Module References for BCM replacement, setup, and programming. |
If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.