P31B7 Mercury Grand Marquis OBD Code

OBD/2 P31B7 error code description and symptoms.

Intake Manifold Runner Control Malfunction (Stuck Open) The IMRC system is monitored for failure during continuous, key ON engine OFF or key ON engine running self-test. The test fails when the signal on the monitor pin is less than an expected calibrated range at closed throttle. IMRC monitor signal circuit shorted to PWR GND or SIG RTN Damaged IMRC actuator Damaged PCM An IMRCM PID reading approximately near 1 volt at closed throttle may indicate a fault.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

P31B7 Mercury Grand Marquis Error Code Repair Process :

The rule of P31B7 code when it comes to emissions-related vehicle repair is that any modification that changes the vehicle from a certified configuration to a non-certified configuration is considered tampering: this applies to both vehicle owners and repair facilities and is, therefore, a Federal offense. Replacing a catalyst with a straight pipe is one traditional example of . Likewise, overriding the OBD P31B7 error in system through the use of high-tech defeat devices or non-certified computer chips, for example, would also be considered tampering. The OBD system may, however, be repaired back to its original certified configuration with certified performance chips or appropriate aftermarket parts.

Common Causes of Mercury Grand Marquis P31B7 OBD2 Code

A common cause of code P31B7 is the failure of , but there are several other possible causes as well, such as ;

1Camshaft Position Sensor circuit poor electrical connection
Engine Control Module (ECM)
Faulty Variable Camshaft Timing (VCT) position solenoid
Starting system circuit Dead (Weak) battery

P31B7 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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P31B7 Mercury Grand Marquis OBD Code

P31B7 Mercury Grand Marquis Error Code Repair Process :

Common Causes of Mercury Grand Marquis P31B7 OBD2 Code

P31B7 code for other Mercury cars