Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 6 (ENGINE CONTROL SYSTEM - 4.2L - DTC P0420 TO P1682)DTC P0446CIRCUIT/SYSTEM TESTING
2006 Isuzu Ascender S, 5.3 M, 4WD
Circuit/System Testing
2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
Refer to the J 41413-200
operation manual for detailed instructions. See Special Tools
.
- Inspect the EVAP vent system for a restriction.
- Test the low reference circuit of the FTP sensor for an open or for high resistance.
- With the GE-41415-50 , connect the J 41413-200 to the fuel filler neck. See Special Tools .
- Start the engine.
- Allow the engine to idle.
- Use the Purge/Seal function to seal the system with a scan tool.
- Command the EVAP canister purge solenoid valve to 20 percent.
- Observe the vacuum/pressure gage on the J 41413-200 and the FTP parameter on the scan tool. See Special Tools .
- Allow the vacuum to increase on the gage of the J 41413-200
until it reaches approximately 16 inches H2O, or until the vacuum reached the abort limit on the scan tool. See Special Tools
.
- If the difference between the FTP parameter on a scan tool and the vacuum/pressure gage on the J 41413-200 was more than 1 inch, replace the FTP sensor. See Special Tools .
- If the maximum Fuel Tank Pressure Sensor parameter on a scan tool display was less than 3.2 volts, replace the FTP sensor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.