Ignition -MIL ON/A/T Stuck in 3rd Gear/DTC's Set
TSB SB04-05-S012Malfunction Indicator Lamp (MIL) ON,
Transmission Stuck in Third Gear,
Instrument Cluster Inoperative
Light Duty ASCENDER 2003 Bulletin Transmission 10/01/04
Light Duty ASCENDER 2004 Bulletin Transmission 10/01/04
Malfunction Indicator Lamp (MIL) ON, Transmission Stuck in Third Gear, Instrument Cluster Inoperative
ISSUE DATE: OCTOBER 2004
Affected Vehicles
2003-2004 Isuzu Ascender (US/UT) models equipped with 4L60-E Automatic Transmission.
Service Information
Condition: Some customers may experience one or more of the following conditions:
^ Malfunction Indicator Lamp (MIL) is ON.
^ Transmission is stuck in third gear.
^ Instrument cluster is inoperative.
Upon investigation, one or all of the diagnostic trouble codes (DTCs) P0740, P0753, P0758, P0785, and P1860 may be set.
Possible Cause:
The most likely cause of this condition may be a loss of power to the transmission on circuit 1020. This loss of power may be caused by an open in the ignition switch. This condition may also be the result of an incorrect installation of an aftermarket electronic device such as a remote starter or alarm system.
Correction:
Refer to the service procedure.
Service Procedure
With the ignition switch in the RUN position, test for battery voltage at the appropriate fuse listed below.
If battery voltage is present at the fuse, inspect circuit 1020 (Pink Wire) between the fuse and the transmission for possible opens. If battery voltage is not present at the fuse, replace the ignition switch using the Ignition Switch Replacement procedure in the Steering Wheel and Column sub-section of the applicable Service Manual.
If the vehicle is equipped with an aftermarket electronic device and the DTCs are being set when the device is being used, verify that the appropriate fuse listed above is being supplied battery voltage during operation. If voltage is not present at this fuse, these DTCs will be set due to lack of power at the solenoids. This condition is most likely to occur with an incorrectly installed remote starting system. If this is the case, refer the customer to the installer of the system for corrections.
Parts Information
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 website.
3. Always refer to the Isuzu Service Policy Procedure Manual for specific details on warranty coverage and policies.
Disclaimer