Conditions for Clearing the MIL/DTC
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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 P0543
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls 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 | Is DTC P0380 set? | - | Go to DTC P0380 (Federal RPO FE9, NG1) or DTC P0380 (California RPO YF5, NE1) | Go to Step 3 |
| 3 |
|
11-13 V, 0.0 V | Go to Step 4 | Go to DTC P0540 |
| 4 |
|
- | Go to Step 5 | Go to Step 6 |
| 5 | Repair the open in the IAH supply voltage circuit between the IAH Relay and the IAH. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 7 | - |
| 6 | Replace the intake air heater. Refer to Intake Air Heater (IAH) Replacement
. Did you complete the replacement? |
- | Go to Step 7 | - |
| 7 |
|
- | Go to Step 8 | Go to Step 2 |
| 8 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? |
- | Go to Diagnostic Trouble Code (DTC) List | System OK |