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Home >> Chevrolet >> 2001 >> Cavalier LS, 2.2 4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 240 (Engine Controls (Troubleshooting & Diagnosis) - 2.2L (L61)) >> Troubleshooting >> Fuel Injector Circuit Diagnosis >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Fuel Injector Circuit Diagnosis

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connect End View Reference:  Powertrain Control Module (PCM) 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 P0201, P0202, P0203, or P0204 set? - Go to DTC P0201-P0204 Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Remove the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement .
  3. Disconnect the harness connector of a fuel injector.
  4. Turn ON the ignition, with the engine OFF.
  5. 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 in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 4  Go to Step 10 
4
  1. Remove the F/P-INJ fuse.
  2. Measure the resistance from the F/P-INJ fuse to the ignition 1 voltage circuit terminal of a fuel injector with a DMM. Refer to Circuit Testing in Wiring Systems.
Is the resistance more than the specified value?		 5 ohm Go to Step 11  Go to Step 5 
5
  1. Connect the J 34730-405  Injector Test Lamp into each injector connector one at a time.
  2. Crank the engine.
Does the test lamp flash for each injector?		 - Go to Fuel Injector Coil Test  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 toCircuit Testing and Wiring Repairs in Wiring Systems.
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 in Wiring Systems.
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 PCM. 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 13  Go to Step 12 
10 Repair the open in the ignition 1 voltage circuit of the fuel injectors. Refer to Wiring Repairs in Wiring Systems.
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 in Wiring Systems.
Did you complete the repair?		 - Go to Step 13  -
12 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
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 
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