Circuit Description
This DTC indicates that an emissions related transmission fault has occurred. The transmission control module (TCM) has no direct control of the malfunction indicator lamp (MIL), but if a transmission fault occurs that is emissions related, the MIL must illuminate. The TCM transmits a MIL request signal over the controller area network (CAN) bus to the engine control module (ECM) and the ECM will turn ON the MIL. This allows the MIL to illuminate, even though the fault was detected by the TCM. If a TCM MIL request signal is received by the ECM, DTC P0700 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
P0700 Transmission Control Module (TCM) Requested MIL Illumination
Conditions for Running the DTC
| • | The ignition is ON. |
| • | DTC P0700 runs continuously when the above condition is met. |
Conditions for Setting the DTC
An emission related transmission DTC has been stored by the TCM.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the MIL after 6 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Observe the DTC Information with a scan tool and record any powertrain DTCs other than DTC P0700. Did you complete the action? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | -- |
