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.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 |
Does the DVM indicate the specified voltage? | 9.0-11.0V | ||
Does the DVM indicate the specified voltage? | 9.0-11.0V | Go to Antilock Brake System (ABS) | ||
4 |
Is the continuity indicated? | -- | ||
5 | Use the DVM J 39200 in order to check the continuity between the Engine Torque Delivered Circuit and ground. Is the continuity indicated? | -- | ||
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? | -- | ||
7 | Repair open or the high resistance in the circuit. Is the action complete? | -- | -- | |
8 | Repair the circuit that is shorted to ground. Is the action complete? | -- | -- | |
9 | Repair the circuit that is shorted to B+ Is the action complete? | -- | -- | |
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? | -- | ||
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? | -- | -- | |
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? | -- | ||
13 |
Is DTC P1895 set? | -- | Go to Diagnostic Aids | |
14 | Replace the TCM. Is the action complete? | -- | -- | |
15 |
Is DTC P1895 set? | -- | ||
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 | |
17 | Does the Transmission now function properly? | -- | System OK | Go to Functional Test |
