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 P1895: Engine Torque Delivered Signal Message Counter Incorrect - CAN Signal
DTC P1896: Engine Control Module (ECM) Driver Torque Request Signal Invalid Data - CAN Signal

### Circuit/System Description

The transmission control module (TCM) receives the engine torque signal and the driver requested engine torque 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

#### P1895, P1896

• | 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

#### P1895

TCM receives engine actual steady state torque validity is "Invalid" for 4 s continuously.

#### P1896

TCM receives engine non-transmission regulated steady state torque validity is "Invalid" for 4 s continuously.

### Action Taken When the DTC Sets

#### P1895

• | DTCs P1895 is Type B DTC.

• | Driver requested engine torque = max torque N.m (ft-lb).

• | The TCM turns OFF all solenoids.

• | The TCM allows the vehicle to operate only in the second gear "R" range after a stop.

#### P1896

• | DTCs P1896 is Type C DTC.

• | Driver requested engine torque = max torque N.m (ft-lb).

• | The TCM turns OFF all solenoids.

• | The TCM allows the vehicle to operate only in the second gear "R" range after a stop.

### Conditions for Clearing the DTC

#### P1895

• | DTC P1895 is Type B DTC.

• | TCM receives engine actual steady state torque validity is "Valid" for 5 min continuously.

#### P1896

• | DTC P1895 is Type C DTC.

• | TCM receives engine non-transmission regulated steady state torque validity is "Valid" 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.

⇒ | If DTC U0100 is not set, replace 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.