Diagnostic Aids
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- A module which loses power during the current ignition cycle, will have a Loss of Communication DTC set by the other modules that require information from the failed module.
- If the TCM, using a faulty manifold absolute pressure (MAP) signal, calculates an invalid torque value, the TCM will command ECM intervention and set a DTC P0701.
- If there is an active vehicle speed malfunction in the TCM, DTC P0701 will set.
- If the ECMs ignition 1 voltage circuit, that is used to wake up the module is open, the TCM may set a DTC U2105 and request a limp-home mode, which will result in DTC P0701 also being set.
DTC P0701
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Controls Schematics
and LINK Connector End View Reference: Engine Controls Connector End Views or Engine Control Module Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device |
| 3 | Select the DTC Information for the body control module (BCM), on the scan tool. Does the scan tool display any DTCs which begin with a U? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 4 |
| 4 | Select the DTC Information for the ECM. Does the scan tool display DTC P0107 or DTC P0108? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 5 |
| 5 | Select the DTC Information for the ECM. Does the scan tool display DTC P0502 or DTC P0503? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 6 |
| 6 |
|
Go to Step 2 | Go to Step 7 |
| 7 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle | System OK |