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Home >> Chevrolet >> 2006 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 6.0L - Troubleshooting & Diagnosis >> Powertrain Relay Diagnosis >> Circuit/System Description

Circuit/System Description

The powertrain ignition 1 relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). The ODM output control is configured to operate as a low side driver for the powertrain ignition 1 relay. The ODM for the powertrain ignition 1 relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain ignition 1 relay ON, ignition 1 voltage is supplied to the following fuses and relay in the underhood fuse block:

The ignition 1 voltage that is supplied to the ECM through the ETC fuse, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain ignition 1 relay contacts have closed.

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