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 P0193

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	Are DTCs P0642 or P0643 set?	-	Go to DTC P0643 or DTC P0642	Go to Step 3
3	Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. 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 4	Go to Intermittent Conditions
4	Turn ON the ignition, with the engine OFF. Observe the Actual Fuel Rail Pressure parameter with a scan tool. Is the Actual Fuel Rail Pressure within the specified range?	1.0-1.8 MPa	Go to Step 6	Go to Step 5
5	Disconnect the fuel rail pressure (FRP) sensor connector. Probe the FRP 5-volt reference circuit with a DMM connected to a good ground. Refer to Troubleshooting with a Digital Multimeter in Wiring Systems. Does the voltage measure near the specified value?	5 V	Go to Step 7	Go to Step 6
6	Test the 5-volt reference circuit of the FRP sensor for high resistance or an open. Refer to Testing for Continuity , Testing for Short to Ground , Testing for a Short to Voltage in Wiring Systems. Repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 17	Go to Step 14
7	Verify that the ignition is ON, with the engine OFF. Verify the FRP sensor harness connector is still disconnected. Measure the voltage between the FRP sensor signal circuit and a good ground circuit at the FRP harness connector with a DMM. Is the current more than the specified value?	5 V	Go to Step 10	Go to Step 8
8	Turn OFF the ignition. Disconnect the negative battery cables. Measure the resistance from the low reference circuit of the FRP sensor to a good ground. Is the resistance less than the specified value?	5 ohm	Go to Step 9	Go to Step 12
9	Turn OFF the ignition. Connect a 3-amp fused jumper wire between the signal circuit of the FRP sensor and the low reference circuit of the FRP sensor. Refer to Using Fused Jumper Wires in Wiring Systems. Turn ON the ignition, with the engine OFF. Observe the Actual FRP parameter with a scan tool. Is the Actual FRP parameter at the specified value?	0.0 MPa	Go to Step 13	Go to Step 11
10	Test for a short to voltage in the FRP sensor signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 17	Go to Step 16
11	Test the signal circuit of the FRP sensor for a high resistance or an open. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you Find and correct the condition?	-	Go to Step 17	Go to Step 14
12	Disconnect the engine control module (ECM). Test the low reference circuit of the FRP sensor for a high resistance or an open. Refer to Testing for Continuity in Wiring Systems. Did you find and correct the condition?	-	Go to Step 17	Go to Step 14
13	Test for an intermittent and for a poor connection at the FRP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 17	Go to Step 15
14	Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 17	Go to Step 16
15	Replace the FRP sensor. Refer to Fuel Rail Pressure (FRP) Sensor Replacement . Did you complete the replacement?	-	Go to Step 17	-
16	Replace the ECM. Refer to Engine Control Module (ECM) Replacement . Did you complete the replacement?	-	Go to Step 17	-
17	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. 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 3	Go to Step 18
18	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