P1318 Diagnostic Trouble Code

P1318 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P1318 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P1318 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P1318.

Fortunately, P1318 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1318 Trouble Code For Specific Cars

P1318 Mg Metro Air Suspension Secondary Front Inflator Solenoid Output Circuit Failure
P1318 Allard P1 Air Bag Driver Circuit Short to Ground - Loop #2
P1318 Rambler 770 Fuel Temperature Sensor B Circuit Intermittent
P1318 Mazda Rx-3 A Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)
P1318 Suzuki X90 Mirror Driver Vertical Feedback Potentiometer Circuit Short to Ground
P1318 Lada Largus Shift Solenoid B Control Circuit Range/Performance
P1318 Ford Transit 3 Mirror Switch Reference Voltage Positive Common Supply Low Voltage