Fuel System - MIL ON/DTC's P0300/P0171/P0174 Set
TSB SB06-04-S002Malfunction Indicator Lamp (MIL) On / Diagnostic
Trouble Code(s) (DTC) P0300, P0171 and P0174, Misfire
Due To Fuel Injector Connectors
ISSUE DATE: JANUARY 30, 2006
Crossed/Swapped/Incorrectly Installed
Affected Vehicles
2005-2006 Isuzu Ascender (US/UT) with 5.3L Engine
Service Information
Condition:
Some customers may comment that the MIL is on. Diagnosis with a scan tool may reveal a DTC P0300, P0171 and/or P0174. No other drivability or performance concerns may be reported.
Possible Cause:
The most likely cause of this issue may be that the fuel injector connectors are crossed or incorrectly installed.
For example, the number 6 fuel injector connector may be plugged into the number 8 fuel injector or visa versa.
Correction:
Inspect and correctly connect fuel injector connectors.
Service Procedure
1. Using a scan tool, check for DTC(s) and write them down.
2. Open the hood and install fender covers.
Important:
DO NOT assume that the fuel injector connectors are properly installed on the correct fuel injectors regardless of mileage.
3. Verify that the fuel injector connectors are correctly installed by matching the wire color of the injectors to the injector location. Refer to the ETM for wiring diagram.
^ If a fuel injector connector is found to be incorrectly installed, correctly install the fuel injector connectors using the appropriate ETM Fuel Injector wiring diagram and continue with the next step.
^ If fuel injectors are found to be correctly installed, refer to the appropriate ETM for diagnosis of the DTC from step 1.
4. Remove the fender covers and close the hood.
5. Using a scan tool, clear the DTC(s).
6. Road test the vehicle at steady highway speeds allowing the vehicle to go into active fuel management to verify the repair.
Warranty Claim Information
Use the labor operation shown.
NOTE:
1. Labor Time includes administrative time allowance.
2. Information released on paper and electronic format prior to bulletin release cannot be updated. For the most current and up to date information refer to the Isuzu website.
3. Always refer to the Isuzu Service Policy Procedure Manual for specific details on warranty coverage and policies.
Disclaimer