TOD Check Light issue

[TrooperNate]

(2001 Troop, 4WD,Auto, 75K miles)
Ok, my transmission check light came on and flashed when I pushed the 4WD Auto button a few months ago. It would go off when I'd turn off the 4WD Auto button. I don't need 4wd during the summer, but as it nears snow time, I started to get annoyed.

After reading about 1000 posts on the Internet I figured it was going to be speed sensors or some other costly fix.

I got my oil changed and tires checked and it still would come on and the 4wd would not function. I decided I was going to get the code read, but everyone wanted like 100 bucks for diagnostic time.

However, just today I decided to try again, and everything is working fine. Anyone know why it would have just "fixed itself"? Could it have been a result of my oil getting changed and it just took a few days to "kick in"? based on this info, anyone know what it could have been?

[atfdmike]

Hi , lots of gremlins are attributed to this Isuzu bulletin:

2001 Isuzu Truck Trooper LS 4WD V6-3.5L

Vehicle Level Technical Service Bulletins All Technical Service Bulletins Electrical - Inspect Connectors for Various Malfunctions Electrical - Inspect Connectors for Various MalfunctionsInformation IB05-04-S005
Inspection Of All Related Wiring Harness Connections
When Diagnosing Miscellaneous DTC's, Intermittent
Driveability Concerns, Hard Start, No Start, Incorrect
Gauges, Inoperative Air Conditioning Systems, Service
Engine Soon Lamps Illuminated, 4WD Lamp Illuminated,
Instrument Panel Gauges Inoperative, Cruise Inoperative
ISSUE DATE: SEPTEMBER 22, 2005
Affected Vehicles
All Isuzu Vehicles
Service Information
When servicing a vehicle for any type of customer concern, the following steps are imperative. Inspect and ensure the integrity of all related wiring harness connectors. If the wiring harness connectors are not properly put together or engaged before they are locked together, numerous types of intermittent conditions may occur, which may include any of the symptoms listed above and possibly others.
The first step in any type of electrical diagnosis is a visual and physical inspection of the wiring harness connectors for integrity. Many times, the vehicle may be repaired just by disconnecting and reconnecting the connectors. As with all repairs to wiring harness connectors and terminals, a pull test of the terminals within the connector should be performed. A pull test is performed by inserting the proper size terminal test tool (not a paper clip) into the terminal to determine whether or not the terminal is making good contact, or whether the terminal has been damaged from the prior improper connection or lack of connection.
NOTE : Most terminals used in current module connectors (ECM, BCM, and the like) are small O~64 mm sq terminals and can be damaged by probing with the wrong tool
For example, if the Connector C2 of the engine wiring harness to the Powertrain Control Module (PCM) is not properly seated into the PCM:
^The cam lock lever may close improperly.
^The cam lock lever may even snap out of position.
^The vehicle may have an intermittent condition with any one of the components which are controlled or monitored by the PCM.
THE CAM LOCK LEVER IS DESIGNED TO PULL (OR ASSIST) THE CONNECTOR INTO ITS FINAL POSITION ONCE IT HAS BEEN PRESSED STRAIGHT INTO THE PCM HEADER PAST THE INITIAL DETENT, ALLOWING THE LEVER TO BE MOVED INTO THE LOCKED POSITION. It is not only a retainer but an assist during the connection process. When the wiring harness connector is properly connected to the PCM, a snap will be heard when the connector is in position to be fully seated. The cam lock lever may then be closed. The cam lock lever will then do its designated job as both an assist and ensuring the connector does not come apart due to vibration or other types of conditions found in vehicles as they travel down the highway.
Remember, if a terminal (metal) or the connector (plastic) is damaged, they should be replaced. DO NOT replace the complete wfring harness assembly. Some harnesses are now on order restriction since most harness damage can be repaired.
Replacement Terminals can be found in the J 38125 Terminal Repair Kit, which is available through Kent Moore at 1-800-654-6333.