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 II 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 II link to the I/P cluster to turn on the MIL.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
DTC P0700 will set if the ECM received a MIL request message from the TCM over the CAN link.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the 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-Engine Controls? | -- | Go to Step 2 | |
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/Type in Automatic Transmission. Did you complete the action? | -- | Go to Step 4 | -- |
6 | Replace the ECM. Refer to Engine Control Module Replacement . 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? | -- | System OK | |
