For 1990-2009 cars
Automatic Transmission Components
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

### Circuit Description

The ECM outputs a PWM signal to the ABS controller and the TCM which is proportional to the engine torque. This signal provides a base line torque value in order to determine the degree of torque reduction required as well as feedback to the ABS controller and the TCM during a torque reduction event. This circuit is pulled up to B+ within the ECM. The ECM induces a signal on the circuit by Pulse Width Modulating the circuit to ground.

### Conditions For Running The DTC

Tests continuously

### Conditions for Setting the DTC

The TCM detects an open, short to ground, or short to B+ on the circuit.

### Action Taken When the DTC Sets

• | The MIL/STL will not illuminate.

• | The TCM memory stores the DTC at the time of the first failure.

### Conditions for Clearing the MIL/DTC

• | A History DTC clears after forty consecutive warm-up cycles if no failures are present by this or any other non-emission related diagnostic.

• | The scan tool clears the MIL/DTC.

### Diagnostic Aids

Use the Connector Test Adapter Kit J 35616-A for any test that requires probing the TCM harness connector or a component harness connector. Using this kit will prevent damage to the harness connector terminals.

Check for the following conditions:

• | Poor connections at the TCM or at the component. Inspect the harness connectors for any backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Refer to Engine Electrical, Troubleshooting Procedures, Checking Terminal Contact for proper procedure.

• | Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the scan tool while moving any related connectors and any wiring harnesses. A change in the display may help to locate the fault.

### Test Description

The number(s) below refer to the step number(s) on the Diagnostic Table.

1. If the circuit voltage restores when the ABS controller disconnects, there is a problem with the ABS system. Refer to Antilock Brake System (ABS).

#### DTC P1895 - Engine Torque Delivered Circuit

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check
2 |

1. Turn off the ignition.
2. Disconnect the TCM.
3. Turn on the ignition with the engine off.
4. Use the DVM J 39200 in order to measure the voltage on the Engine Torque Delivered Circuit at the TCM harness connector.

Does the DVM indicate the specified voltage?

9.0-11.0V

Go to Step 6

Go to Step 3

3 |

1. Turn off the ignition.
2. Disconnect the ABS controller.
3. Turn on the ignition with the engine off.
4. Use the DVM J 39200 in order to measure the voltage on the Engine Torque Delivered Circuit at the TCM harness connector.

Does the DVM indicate the specified voltage?

9.0-11.0V

Go to Antilock Brake System (ABS)

Go to Step 4

4 |

1. Turn off the ignition.
2. Disconnect the ECM.
3. Use the DVM J 39200 in order to check the harness for continuity on the Engine Torque Delivered Circuit from the ABS controller to the TCM and from the ABS controller to the ECM.

Is the continuity indicated?

--

Go to Step 5

Go to Step 7

5 | Use the DVM J 39200 in order to check the continuity between the Engine Torque Delivered Circuit and ground. Is the continuity indicated? | -- | Go to Step 8 | Go to Step 10
6 | Use the test light J 34142-B connected to ground in order to probe the Engine Torque Delivered Circuit at the TCM harness connector. Does the test light illuminate? | -- | Go to Step 9 | Go to Step 12
7 | Repair open or the high resistance in the circuit. Is the action complete? | -- | Go to Step 15 | --
8 | Repair the circuit that is shorted to ground. Is the action complete? | -- | Go to Step 15 | --
9 | Repair the circuit that is shorted to B+ Is the action complete? | -- | Go to Step 15 | --
10 | Check the ECM harness connector for a poor connection or poor terminal tension. Refer to Engine Electrical, Troubleshooting Procedures, Checking Terminal Contact for the proper procedure. Was a problem found and corrected? | -- | Go to Step 15 | Go to Step 11
11 | Important: This vehicle has a Theft Deterrent System which interfaces with the Engine Control Module (ECM). Program the new ECM with the frequency code of the theft deterrent module currently on the vehicle. Replace the ECM. Refer to Engine Controls, On Vehicle Service, ECM .

Is the action complete?

--

Go to Step 15

--

12 | Check the TCM harness connector for a poor connection or poor terminal tension. Refer to Engine Electrical, Troubleshooting Procedures, Checking Terminal Contact for proper procedure. Was a problem found and corrected? | -- | Go to Step 15 | Go to Step 13
13 |

1. Clear the DTCs with the scan tool.
2. Turn off the ignition for 15 seconds.
3. Start the engine.
4. Operate the vehicle within the conditions required for this diagnostic to run. Refer to Conditions for Running the DTC.
5. Check for any DTCs.

Is DTC P1895 set?

--

Go to Step 14

Go to Diagnostic Aids

14 | Replace the TCM. Is the action complete? | -- | Go to Step 15 | --
15 |

1. Clear the DTCs with the scan tool.
2. Turn off the ignition for 15 seconds.
3. Start the engine.
4. Operate the vehicle within the conditions required for this diagnostic to run. Refer to Conditions for Running the DTC.
5. Check for any DTCs.

Is DTC P1895 set?

--

Go to Step 2

Go to Step 16

16 | Were there any additional DTCs noted during the Powertrain or Transmission OBD System Check that have not been diagnosed? | -- | Go to the applicable DTC table | Go to Step 17
17 | Does the Transmission now function properly? | -- | System OK | Go to Functional Test