SMU - Revised DTC P0128
| Subject: | Revised DTC P0128 |
| Models: | 2006 Cadillac DTS |
This bulletin is being issued to revise the Circuit/System Testing section of DTC P0128 in the Engine Controls sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.
The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.
Circuit/System Testing
Important: All electrical components and accessories must be turned OFF and allowed to power down.
- Ignition OFF, disconnect the ECT harness connector at the ECT sensor.
- Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal B and ground.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
Ignition ON, verify the scan tool ECT Sensor parameter is less than -39°C (-38°F).
| ⇒ | If greater than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM. |
Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B . Verify the scan tool ECT Sensor parameter is greater than 149°C (300°F).
| ⇒ | If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
If all circuits test normal, test or replace the ECT sensor.
