Conditions for Clearing the MIL/DTC

WARNING: This page is about a different car, the 2004 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
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 emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

DTC P1374

Step	Action	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module (PCM) Connector End Views
1	Did you perform the Diagnostic System Check-Engine Controls?	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Attempt to start the engine. Does the engine start and run?	Go to Step 3	Go to Step 4
3	Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition. Start the engine. Operate the vehicle within the conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition?	Go to Step 4	Go to Intermittent Conditions
4	Turn OFF the ignition. Disconnect the ignition control module (ICM). Turn ON the ignition, with the engine OFF. Connect a test lamp to battery voltage. Observe the engine speed parameter on the scan tool. Repeatedly touch the test lamp quickly to the low resolution engine speed signal circuit at the ICM harness connector. Is an engine speed displayed?	Go to Step 8	Go to Step 5
5	Inspect for the following conditions: The low resolution engine speed signal circuit open The low resolution engine speed signal circuit shorted to ground The low resolution engine speed signal circuit shorted to voltage If a condition is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 6
6	Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Continuity , Testing for Intermittent Conditions and Poor Connections , Repairing Connector Terminals , and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 7
7	Inspect for the following conditions: An incorrect harness routing near secondary ignition components An ignition coil arcing to the wiring harness or to the ignition control module IMPORTANT: If carbon tracking is detected on any component, replace that component and its mate. Ignition coils for cracks, carbon tracking, or other signs of damage-Refer to Ignition Coil(s) Replacement . Secondary ignition wires arcing to the wiring harness-Refer to Spark Plug Wire Replacement . Did you find and correct the condition?	Go to Step 11	Go to Step 10
8	Test for an intermittent and for a poor connection at the ICM. Refer to Repairing Connector Terminals in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 9
9	Replace the ICM. Refer to Ignition Control Module Replacement . Did you complete the replacement?	Go to Step 11	-
10	Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement . Did you complete the replacement?	Go to Step 11	-
11	Clear the DTCs with a scan tool. Turn OFF the ignition. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition?	Go to Step 2	Go to Step 12
12	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	Go to Diagnostic Trouble Code (DTC) List	System OK