P1113 Possible Causes
- Faulty switching valve
- Switching valve harness is open or shorted
- Poor electrical connection in switching valve circuit
- Faulty Engine Control Module (ECM)
How is Code P1113 Repaired?
Begin by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Engine Light On (or Service Engine Soon Warning Light)
P1113 Meaning
The Multi-Ram system uses variable intake air tuning to achieve maximum performance and efficiency across the entire engine operating range. The system consists of 2 main components. The intake manifold contains an intake plenum switching valve. This vacuum-operated valve is essentially a movable divider that changes the airflow characteristics of the intake manifold. The vacuum to the valve is controlled by a solenoid valve operated by the Engine Control Module (ECM).
The intake resonance switching valve is located in the air intake duct in front of the engine. This vacuum-operated valve is also a movable divider that changes the tuning of the air intake system. The vacuum to the valve is controlled by an ECM-controlled solenoid valve. By opening and closing these valves independently in different combinations, 4 different airflow configurations can be created, each optimized for a particular set of engine operating conditions.
Both solenoid valves are powered via the main relay (switched battery power circuit). Both solenoid valves have a control circuit to the ECM. The ECM controls a valve by grounding the control circuit through an internal driver. The main function of the driver is to provide ground for controlled components. Each driver has a fault line that is monitored by the ECM. When the ECM commands a component to turn on, the control circuit voltage should be low (near zero volts). When the ECM commands the control circuit to a component off, the circuit voltage should be high (near battery voltage). If the fault detection circuit detects a voltage other than expected, this Diagnostic Trouble Code (DTC) will be set.
The ECM will monitor the circuit for a short to ground, short to voltage, open circuit resistance, or an internal short or excessively low resistance in the circuit. When the ECM detects any of these malfunctions, this DTC is set and the affected driver is disabled. The ECM will continue to test the circuit and if the fault disappears, the driver will be reactivated.