Circuit Description
The engine control module (ECM) employs an internal module in order to continuously monitor the knock sensor (KS) control circuit. The KS module contains the circuitry that allows the ECM to utilize the KS signals and diagnose the KS sensors and circuitry. The KS module is not a replaceable component. If the ECM detects a fault in the ability of the KS module to sample these signals, this diagnostic trouble code (DTC) will set.
Conditions for Running the DTC
| • | Tested continuously |
| • | The engine coolant temperature (ECT) is more than 40°C (104°F). |
Conditions for Setting the DTC
The ECM detects a fault in the internal knock sensor module.
Action Taken When the DTC Sets
The ECM will not illuminate the malfunction indicator lamp (MIL).
Conditions for Clearing the MIL/DTC
| • | The DTC clears after forty consecutive warm-up cycles if no failures report by this diagnostic or any other non-emission related diagnostic. |
| • | The scan tool clears the MIL/DTC. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Step 2 | |
2 |
Important: This vehicle is equipped with a theft deterrent system that interfaces with the ECM. Program the new ECM with the frequency code of the theft deterrent module that is currently on the vehicle. Replace the ECM. Refer to Engine Control Module Replacement/Programming . Is the action complete? | -- | Go to Step 3 | -- |
3 |
Does the scan tool indicate that the diagnostic Passed? | -- | Go to Step 4 | Go to Step 2 |
4 | Does the scan tool display any additional undiagnosed DTCs? | -- | Go to the applicable DTC table | System OK |
