P1740 Diagnostic Trouble Code

P1740 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 P1740 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Dirty air cleaner element Damaged DPF

Repair Processes :

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. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code P1740 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 P1740.

Fortunately, P1740 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1740 Trouble Code For Specific Cars

P1740 Peugeot Tepee Engine Oil Pressure Sensor/Switch Low Voltage
P1740 Fiat Panda Lamp Turn Signal Rear Output Circuit Short To Ground
P1740 Holden Hb Power Door Memory Lock Relay Circuit Failure
P1740 Nissan Primastar Crankshaft Position Camshaft Position Correlation (Bank 1 Sensor A)
P1740 Abarth A112 A Camshaft Position Actuator Circuit (Bank1)
P1740 Audi Q7 ASM Control Circuit High
P1740 Simca Ariane Intercooler Pump Driver Fault