Circuit Description
This DTC indicates that the engine control module (ECM) received a message from the transmission control module (TCM) to turn ON the malfunction indicator lamp (MIL) telltale due to a transmission related OBD 2 failure. The ECM will send a message via the controller area network (CAN) link to the body control module (BCM) who will send a message over the class 2 link to the instrument panel cluster (IPC) to turn ON the MIL.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0700 Transmission Control Module (TCM) Requested MIL Illumination
Conditions for Running the DTC
| • | The engine is running. |
| • | DTC P0700 runs continuously once the above conditions are met. |
Conditions for Setting the DTC
DTC P0700 will set if the ECM received a MIL request message from the TCM over the CAN link for more than 5 seconds.
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 malfunction indicator lamp (MIL) after 3 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. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic References: Automatic Transmission Controls Schematics in Automatic Transmission Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the DTC fail this ignition? | -- | Go to Step 3 | Go to Intermittent Conditions |
Connect a scan tool. Are there any transmission DTCs set? | -- | Go to Step 5 | Go to Step 4 | |
4 | Was an engine control module (ECM) communication condition repaired? | -- | Go to Step 7 | Go to Step 6 |
5 | Diagnose and repair any transmission DTCs. Refer to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information. Did you complete the action? | -- | Go to Step 4 | -- |
6 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 7 | -- |
7 |
Does the DTC run and pass? | -- | Go to Step 8 | Go to Step 3 |
8 | Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |
