Circuit Description
The WOT switch signal circuit pulls up to B+ within the TCM. The switch connects to ground. When you depress the accelerator pedal beyond the equivalent of about a 89% throttle angle, the switch closes, pulling the signal voltage low. The TCM interprets this signal voltage as WOT Active.
Conditions for Running the DTC
| • | No Throttle position sensor default values are set. |
| • | The engine speed is greater than 500 RPM but less than 8160 RPM. |
| • | The throttle angle is less than 89%. |
| • | The WOT is Active. |
Conditions for Setting the DTC
A DTC P1835 stores.
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
| • | The Kickdown function enables with the throttle limit. |
| • | 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 WOT Switch indicate Off when the accelerator pedal is released, and On when the accelerator is at WOT? | -- | No trouble found Refer to Diagnostic Aids | |
Does the WOT Switch parameter always indicate Off? | -- | |||
4 |
Does the scan tool indicate On? | -- | ||
5 | Use a fused jumper in order to jumper the signal circuit to a known good ground. Does the scan tool indicate On? | -- | ||
6 |
Is the continuity indicated? | -- | ||
7 | Disconnect the WOT switch. Does the scan tool indicate Off? | -- | ||
8 |
Is the continuity indicated? | -- | ||
9 | Repair the ground circuit to the WOT switch. Is the action complete? | -- | -- | |
10 | Repair the open/high resistance WOT switch signal circuit. Is the action complete? | -- | -- | |
11 | Repair the WOT switch signal circuit shorted to ground. Is the action complete? | -- | -- | |
12 | Check the WOT 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 | Replace the WOT switch. 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 P1835 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 |
