Circuit Description
The TCM sends a Pulse Width Modulated (PWM) signal to the ABS controller. The signal pulse width corresponds to the actual gear in which the transmission is currently operating. If a circuit fault is detected by the TCM, this DTC will set.
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 output 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.
| • | Poor connections at the ECM or TCM. 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. |
| • | Misrouted harness. Inspect the harness to ensure that the harness is not routed too close to high voltage wires such as spark plug leads, or too close to high current devices such as the alternator, motors, solenoids etc. |
| • | Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the scan tool while any related connectors and any wiring harnesses. A change in the display may help to locate the fault. |
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? | B+ | ||
3 |
Is the continuity indicated? | -- | ||
4 | Use the DVM J 39200 in order to check the continuity between the Transmission Gear Ratio Output Circuit and ground. Is the continuity indicated? | -- | ||
5 | Use the test light J 34142-B connected to ground in order to probe the Transmission Gear Ratio Output Circuit at the TCM harness connector. Does the test light illuminate? | -- | ||
6 | Repair the open or high resistance in the circuit. Is the action complete? | -- | -- | |
7 | Repair the circuit shorted to ground. Is the action complete? | -- | -- | |
8 | Repair the circuit shorted to B+ Is the action complete? | -- | -- | |
9 | Check the ABS controller harness 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 Antilock Brake System (ABS) | |
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 Test Description | ||
11 |
Is DTC P1845 set? | -- | ||
12 | 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 | |
13 | Does the Transmission now function properly? | -- | System OK | Go to Functional Test |
