68 Electrical System and Sensor Troubleshooting TP-6903 5/16a
Action Yes No
Turn the ECM power OFF.
Disconnect the Fuel Control Valve (FCV) connector.
Using a DVOM, check the resistance between the two pins of the
FCV solenoid
Does the DVOM show a resistance value greater than 42 Ohms?
Does the DVOM show a resistance value of less than 30 Ohms?
Replace the FCV. Go to the next step.
With the ECM power OFF, disconnect the ECM wire harness
connector.
Using a DVOM, check continuity between FCV connector pin 2 and
ECM connector P26 pin 22.
Does the DVOM show continuity?
Go to the next step.
Repair the open FCV
control circuit as
required.
Using a DVOM, check for continuity between FCV connector pin 2 and
engine ground.
Does the DVOM show continuity?
Repair the shorted to
ground FCV control
circuit as required.
Go to the next step.
Inspect the ECM wire harness and connector and FCV connector for
damage, corrosion, or contamination.
Did a problem exist?
Correct the problem
as required.
Go to the next step.
Replace the fuel control valve. Refer to Section 5.5.
Go to the next step.
Remove all test equipment except Spectrum.
Connect any disconnected components.
Using Spectrum software, clear DTC information from the ECM.
Turn the ECM power OFF and wait 30 seconds.
Start the engine and operate to full operating temperature.
Observe the engine performance.
After operating the engine, check for any stored codes.
Does the engine operate normally with no stored codes?
System OK. Go to the next step.
Replace the ECM. Refer to Section 5.4.
Is the replacement complete?
Go to the next step.
Remove all test equipment except Spectrum.
Connect any disconnected components.
Using Spectrum software, clear DTC information from the ECM.
Turn the ECM power OFF and wait 30 seconds.
Start the engine and operate to full operating temperature.
Observe the engine performance.
After operating the engine, check for any stored codes.
Does the engine operate normally with no stored codes?
System OK.
Restart the fuel control
valve troubleshooting
procedure. Look for
other DTC codes
stored in the ECM.
Figure 4-13 Fuel Control Valve Troubleshooting
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