Test Description
WARNING: This page is about a different car, the 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 3: This step determines if there is voltage present to the ECM fuse.
- 5: This step determines if voltage is present at the PCM.
- 6: This step determines if the PCM ignition 1 voltage circuit is shorted to ground.
DTC P1682
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Powertrain 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 Testing for Intermittent Conditions and Poor Connections |
| 3 | With a test lamp connected to ground, probe both sides of the 15-amp ECM/ETC fuse. Does the test lamp illuminate on both sides of the fuse? |
- | Go to Step 5 | Go to Step 4 |
| 4 | Does the test lamp illuminate on one side of the fuse? | - | Go to Step 6 | Go to Powertrain Relay Diagnosis |
| 5 |
|
- | Go to Step 9 | Go to Step 7 |
| 6 |
|
- | Go to Step 9 | Go to Step 7 |
| 7 | Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 9 | Go to Step 8 |
| 8 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 9 | - |
| 9 |
|
- | Go to Step 2 | Go to Step 10 |
| 10 | 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 |