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Home >> Cadillac >> 2004 >> CTS Base, 3.6 7 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls - 2.6L & 3.2L - Troubleshooting & Diagnosis) >> Troubleshooting >> Fuel Injector Coil Test >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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.
  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.
Fuel Injector Coil Test

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 Observe the engine coolant temperature (ECT) with a scan tool.
Is the ECT parameter above the specified value?		 20°C (68°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 in Wiring Systems.
Do any of the fuel injectors display a resistance outside the specified range?		 13-15.5 Ω Go to Step 6  Go to Diagnostic Aids
4 
  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 in Wiring Systems.
  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 Fuel Injector Balance Test with Special Tool  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 individual fuel injector resistance value from the average resistance value.
  4. Subtract the average resistance value from the highest individual fuel injector resistance value.
  5. Replace the fuel injector that displays the greatest resistance difference above or below the average. Refer to Fuel Injectors and Fuel Rail 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 Injectors and Fuel Rail Replacement .
Did you complete the replacement?		 13-15.5 Ω 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 
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