Conditions for Clearing the MIL/DTC
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
- The DTC becomes history when the conditions for setting the DTC are no longer present.
- The history DTC clears after 40 malfunction free warm-up cycles.
- The PCM receives a clear code command from the scan tool.
DTC P1637
| Step | Action | Value | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Starting and Charging Schematics Connector End View Reference: Engine Electrical 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 Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 |
|
10 V | Go to Step 5 | Go to Step 4 |
| 4 | Test the generator turn on signal circuit for a short or open. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 8 | Go to Step 6 |
| 5 | Inspect for poor connections at the harness connector of the generator. Refer to Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 8 | Go to Charging System Test |
| 6 | Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 8 | Go to Step 7 |
| 7 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Is the action complete? |
- | Go to Step 8 | - |
| 8 |
|
- | Go to Step 2 | System OK |