Diagnostic Aids

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Performing the Fuel Injector Coil Test may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis (w/J39021 or w/Tech 2) or Fuel Injector Diagnosis (w/CH47976) .
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .

Fuel Injector Circuit Diagnosis

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Is DTC P0201, P0202, P0203, or P0204 set?	-	Go to DTC P0201, P0202, P0203, or P0204	Go to Step 3
3	Turn OFF the ignition. Remove the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement . Disconnect the harness connector of a fuel injector. Turn ON the ignition, with the engine OFF. Probe the ignition 1 voltage circuit of a fuel injector, fuse side, with a test lamp that is connected to a good ground. Refer to Probing Electrical Connectors . Does the test lamp illuminate?	-	Go to Step 4	Go to Step 10
4	Remove the IGN/INJ fuse. Measure the resistance from the IGN/INJ fuse to the ignition 1 voltage circuit terminal of a fuel injector with a DMM. Refer to Circuit Testing . Is the resistance more than the specified value?	5 Ω	Go to Step 11	Go to Step 5
5	Connect the J 44603 Injector Test Lamp into each injector connector one at a time. See Special Tools . Crank the engine. Does the test lamp flash for each injector?	-	Go to Fuel Injector Diagnosis (w/J39021 or w/Tech 2) or Fuel Injector Diagnosis (w/CH47976)	Go to Step 6
6	Does the test lamp remain illuminated at all times for any injector circuit?	-	Go to Step 8	Go to Step 7
7	Test the control circuits of the fuel injectors for an open and for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 13	Go to Step 9
8	Test the control circuits of the fuel injectors for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 13	Go to Step 12
9	Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 13	Go to Step 12
10	Repair the open in the ignition 1 voltage circuit of the fuel injectors. Refer to Wiring Repairs . Did you complete the repair?	-	Go to Step 13	-
11	Repair the high resistance in the ignition 1 voltage circuit of the fuel injectors. Refer to Wiring Repairs . Did you complete the repair?	-	Go to Step 13	-
12	Replace the engine control module (ECM). Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 13	-
13	Operate the system in order to verify the repair. Did you correct the condition?	-	System OK	Go to Step 2