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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 85 (Transfer Case - ISUZU T150) >> Diagnostic Information and Procedures >> Accessory Switch Transfer Case Mode Indicator Flashes in 2WD Mode >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

The Isuzu T150 transfer case contains a 2WD/4WD switch, which is supplied battery voltage by the transfer case shift control module. When the transfer case mode selection is in either 4WD low or 4WD high the 2WD/4WD switch provides a path to ground, pulling the 2WD/4WD signal circuit low. This assists the transfer case shift control module in determining the present mode. A fault in the 2WD/4WD signal circuit, or the neutral switch signal circuit will cause the 2WD mode indicator to flash. A fault in the front axle actuator or the corresponding front axle actuator circuits can also cause the 2WD mode indicator to flash. In the 2WD mode the switch is open and the voltage on the 2WD/4WD signal circuit is battery voltage.

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