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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Controls And Fuel - 2.0L (LUZ) Diesel - DTC P2122 To DTC P2689 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2687-P2689: Fuel Heater Relay Control Circuit >> Circuit/System Description

Circuit/System Description

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Ignition voltage is supplied to the coil side of the fuel heater relay whenever the ignition is ON. The ECM provides a ground to control the fuel heater relay. When the ECM is commanding the fuel heater ON, the voltage of the control circuit should be low, near 0 V. When the ECM is commanding the fuel heater OFF, the voltage of the control circuit should be high, near battery voltage.

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