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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 (Engine Control System & Fuel System - 3.7L - DTC P1111 To DTC P2444) >> DTC P1682 >> Circuit/System Description

Circuit/System 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.

There are 2 ignition 1 voltage circuits supplied to the powertrain control module (PCM). The first ignition 1 voltage circuit is provided by the powertrain relay through a fuse. This ignition 1 voltage circuit supplies power to all the internal PCM circuits associated with the throttle actuator control (TAC) operation. The ignition main relay provides the second ignition 1 voltage circuit to the PCM through a fuse. This ignition 1 voltage provides power to other internal PCM circuits, except those associated with TAC operation. The PCM continuously monitors the voltage level difference between the 2 circuits.

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