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Home >> Suzuki >> 2007 >> SX4 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Engine General Information And Diagnosis) >> Diagnostic Information and Procedures >> DTC P0201 Injector 1 Circuit Fault >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2005 Suzuki Reno and 2005 Suzuki Forenza. However, it is still accessible from the selected car via links, so may be relevant.

The Engine Control Module (ECM) has four individual injector driver circuits, each of which controls an injector. When a driver circuit is grounded by the ECM, the injector is activated. The ECM monitors the current in each driver circuit. The ECM measures a voltage drop through a fixed resistor and controls it. The voltage on each driver is monitored to detect a fault. If the voltage is not what the ECM expects to monitor on the circuit, a Diagnostic Trouble Code (DTC) is set. This DTC detects a short to ground and/or an open circuit and short to battery conditions for low-side drive injector outputs.

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