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 control module stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. |
| • | The driver information center, if equipped, may display a message. |
Conditions for Clearing the DTC
| • | A current DTC Last Test Failed clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | Clear the DTC with a scan tool. |
Step | Action | Yes | No | ||||
|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check-Engine Controls? | Go to Step 2 | |||||
2 |
Important:
Replace the ECM. Refer to Engine Control Module Replacement . Did you complete the action? | Go to Step 3 | -- | ||||
3 |
Does the DTC run and pass? | Go to Step 4 | Go to Step 2 | ||||
4 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | System OK |
