For 1990-2009 cars

### 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 P1835: Kickdown Switch Signal Performance - CAN Signal

### Circuit/System Description

The transmission control module (TCM) receives the kickdown switch signal via CAN bus The TCM needs this signal to select the appropriate gear and to choose the correct shift pattern.

### Conditions for Running the DTC

#### P1835

• | The ignition voltage is between 10.2 V and 15.5 V.

• | The engine speed is greater than 400 RPM for 2 s.

• | The transmission is not in emergency mode.

• | Accessory ON for more than 3 s.

• | TCM communication is normal.

• | DTC U0100 is not set.

### Conditions for Setting the DTC

#### P1835

• | TCM receives accelerator kick down detected is "Active".

• | Accelerator effective position is less than 65% for 2 s continuously.

### Action Taken When the DTC Sets

#### P1835

• | DTCs P1835 is Type D DTC.

• | None.

### Conditions for Clearing the DTC

#### P1835

• | DTC P1835 is Type D DTC.

• | No fault decision for 5 min continuously.

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Description and Operation

Transmission Component and System Description

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Verify DTC U0100 is not set.

⇒ | If DTC U0100 is set, diagnose this first.

### Circuit/System Testing

#### Dynamic Test

Ignition ON, observe the scan tool APP Angle parameter while depressing the accelerator pedal. The value should grow with the more depressed accelerator pedal until 100% with fully depressed pedal.

⇒ | If the value is not within the specified range, replace the K20 Engine Control Module (ECM).

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | TCM, refer to Control Module References for replacement, setup and programming.

⇒ | Perform the Transmission Adaptive Functions.

• | ECM replacement, refer to Engine Control Module Replacement for LDK, Engine Control Module Replacement for LBS, LBX, LBY, Engine Control Module Replacement for LBW..

• | ECM, refer to Engine Control Module Programming and Setup for setup and programming.