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Home >> Chevrolet >> 2009 >> TrailBlazer 4.2 S, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - DTC P0366 T0 DTC P2544 >> DTC P0685 or P0690 >> Typical Scan Tool Data

Typical Scan Tool Data

EC Ignition Relay Feedback Signal

Circuit Normal Range Short to Ground Open Short to Voltage
Operating Conditions:  Ignition ON, with the engine OFF
Battery Supply Voltage - Coil - 0 V 0 V -
Battery Supply Voltage - Armature - 0 V 0 V -
EC Ignition Relay Control - 0 V 0 V -
EC Ignition Relay Feedback 11.9-12.9 V 0 V 0 V More than 2 V1
1 DTC P0690 will set if the ECM detects voltage when the ignition is in the OFF position.