LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1558 (Engine Controls And Fuel - 3.5L (L66) - Troubleshooting & Diagnosis) >> Fuel Injector Solenoid Coil Test >> Test Description

Test Description

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.

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

  1. 3:  This step tests each fuel injector resistance within a specific temperature range. If any of the fuel injectors display a resistance outside of the specified value, replace the fuel injector.
  2. 4:  This step determines if all of the fuel injectors are within 3 ohms of each other. If the highest resistance value is within 3 ohms of the lowest resistance value, then all of the fuel injector coil windings are OK.
  3. 5:  This step determines which fuel injector is faulty. After subtracting the highest and lowest resistance values from the average value, replace the fuel injector that has the greatest resistance difference from the average.
Fuel Injector Solenoid Coil Test

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module Connector End Views or 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 Observe the engine coolant temperature (ECT) with a scan tool.
Is the ECT value within the specified range?		 10-32°C (50-90°F) Go to Step 3  Go to Step 4 
3 
  1. Disconnect the fuel injector multi-way harness connector.
  2. Measure the resistance of each fuel injector between the ignition feed circuit and the fuel injector control circuit, at the multi-way connector, with the DMM. Refer to Testing for Continuity .
Do any of the fuel injectors display a resistance outside the specified range?		 10-13 Ω Go to Step 6  Go to Diagnostic Aids in this test
4 
  1. Disconnect the fuel injector multi-way connector.
  2. Measure the resistance of each fuel injector between the ignition feed circuit and the fuel injector control circuit, at the multi-way connector, with the DMM.
  3. Record each fuel injector value.
  4. Subtract the lowest resistance value from the highest resistance value.
Is the difference equal to or less than the specified value?		 3 Ω Go to Diagnostic Aids In This Test Go to Step 5 
5 
  1. Add all of the fuel injector resistance values to obtain a total resistance value.
  2. Divide the total resistance value by the number of fuel injectors to obtain an average resistance value.
  3. Subtract the lowest and the highest individual fuel injector resistance values from the average resistance value.
  4. Replace the fuel injector that displays the greatest resistance difference above or below the average. Refer to Fuel Injector Replacement .
Did you complete the replacement?		 - Go to Step 7  -
6 Replace the fuel injector or fuel injectors that are out of the specified range. Refer to Fuel Injector Replacement .
Did you complete the replacement?		 - Go to Step 7  -
7 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 2 
scientia non olet · About LEMON Manuals