Circuit Description
The TCM pulls this circuit up to 12 volts in gear positions R,D,3,2,1. The circuit voltage is pulled low in P/N. The ECM monitors the circuit voltage. One of the ECMs uses for this signal is to compensate for in-gear engine load. If the TCM detects a problem on this circuit, this DTC will set.
Conditions For Running The DTC
Tests continuously
Conditions for Setting the DTC
The commanded state of the circuit does not match the actual state.
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 Park/Neutral Switch indicate P-N when the shift lever is in Park or Neutral, and R-D-3-2-1 in all other positions? | -- | No trouble found Refer to Diagnostic Aids | |
Does the Park/Neutral Switch parameter always indicate P-N? | -- | |||
4 |
Does the scan tool indicate R-D-3-2-1? | -- | ||
5 | Did the test light illuminate? | -- | ||
6 | Use the DVM J 39200 in order to check the harness continuity on the Park/Neutral output circuit from the TCM to the ECM. Is the continuity present? | -- | ||
7 |
Does the scan tool indicate P-N? | -- | ||
8 |
Does the test light illuminate? | -- | ||
9 | Repair the Park/Neutral output circuit shorted to B+. Is the action complete? | -- | -- | |
10 | Repair the open/high resistance Park/Neutral output circuit. Is the action complete? | -- | -- | |
11 | Repair the Park/Neutral output circuit shorted to ground. Is the action complete? | -- | -- | |
12 | Check the ECM 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 |
Important: This vehicle is equipped with a Theft Deterrent System which interfaces with the Engine Control Module (ECM). You must program the new ECM with the frequency code of the theft deterrent module currently on the vehicle. Replace the ECM. Refer to Engine Control Module Replacement/Programming . Is the action complete? | -- | -- | |
14 | 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? | -- | ||
15 | Replace the TCM. Refer to Automatic Transmission, On Vehicle Service, TCM . Is the action complete? | -- | -- | |
16 |
Is DTC P1705 set? | -- | ||
17 | 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 | |
18 | Does the Transmission now function properly? | -- | System OK | Go to Functional Test |
