P0700

DTC P0700

CIRCUIT DESCRIPTION
The transmission control module (TCM) requests to illuminate the malfunction indicator lamp (MIL) through the request circuit to the engine control module (ECM) when the TCM sets a MIL request DTC(s). If the ECM detects the MIL illumination request signal, this DTC will set.

Condition for Running the DTC
- The ignition switch is ON.

Condition for Setting the DTC
- The ECM detects that the MIL illumination is requested by the TCM for longer than 6 seconds.

Action Taken When the DTC Sets
- The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Freeze Frame/Failure Records.

Condition for Clearing the MIL/DTC
- The ECM turns OFF the MIL after 3 consecutive driving cycles when 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 after the ECM turns OFF the MIL.
- Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

NOTE: Under normal conditions if the TCM sets a DTC that requests the MIL to be illuminated, P0700 will set.

If an intermittent condition is suspected, the following may cause an intermittent:
- Misrouted harness
- Rubbed through wire insulation
- Broken wire inside the insulation

Check for the following conditions:
- Damaged harness: Inspect the wiring harness for damage. If the harness appears to be OK, observe the "DTC P0700 Last Test" display on the scan tool with engine running while moving connectors and wiring harness. A change in the display will indicate the location of the fault.

Test Description
The number below refers to the step number on the diagnostic table.
2. If the TCM has diagnostic trouble codes (DTCs) set that are requesting MIL illumination, diagnose that DTC FIRST.
9. If the TCM has DTCs set, clear the DTCs in the TCM FIRST.

DTC P0700
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views

Step 3 - 8:

Step 9 - 10: