Test Description

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 numbers below refer to the step numbers on the diagnostic table.

4: This step tests for voltage at the fuel injector harness connector. The INJR fuse supplies power to the coil side of the fuel injector harness connector. If the fuse is open, a short to ground on the ignition 1 voltage supply circuit of the fuel injector is indicated.
5: This step verifies that the PCM is able to control the fuel injector. If the test lamp flashes, the PCM and wiring are OK.
6: This step tests if a ground is constantly being applied to the fuel injector.

DTC P0201-P0206

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	Clear the DTCs with a scan tool. Idle the engine at the normal operating temperature. Monitor the misfire current counters with a scan tool. Are any of the counters incrementing?	Go to Step 4	Go to Step 3
3	Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition?	Go to Step 4	Go to Diagnostic Aids
4	Turn OFF the ignition. Disconnect the appropriate harness connector of the fuel injector. Turn ON the ignition, with the engine OFF. Probe the ignition 1 voltage supply circuit of the fuel injector with a test lamp that is connected to a good ground. Does the test lamp illuminate?	Go to Step 5	Go to Step 11
5	Connect the J 34730-405 Injector Test Lamp or J 34730-2C Injector Test Lamp between the control circuit and the ignition 1 voltage supply circuit of the fuel injector harness connector. Start the engine. Does the test lamp flash?	Go to Step 9	Go to Step 6
6	Does the test lamp remain illuminated at all times?	Go to Step 8	Go to Step 7
7	Test the control circuit of the fuel injector for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 14	Go to Step 10
8	Test the control circuit of the fuel injector for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 14	Go to Step 13
9	Inspect for poor connections at the harness connector of the fuel injector. Refer toTesting for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems. Did you find and correct the condition?	Go to Step 14	Go to Step 12
10	Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems. Did you find and correct the condition?	Go to Step 14	Go to Step 13
11	Repair the ignition 1 voltage supply circuit of the fuel injector for an open or a short to ground. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 14	-
12	Replace the fuel injector. Refer to Fuel Injector Replacement . Did you complete the replacement?	Go to Step 14	-
13	Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement . Did you complete the replacement?	Go to Step 14	-
14	Use the scan tool in order to clear the DTCs. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC run and pass?	Go to Step 15	Go to Step 2
15	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