C1702 Diagnostic Trouble Code

C1702 is a kind of OBD-II Diagnostic C-Chassis 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 C1702 diagnostic trouble code may include:

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
Faulty or damaged wiring
Hesitation upon acceleration
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.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. 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 engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code C1702 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 C1702.

Fortunately, C1702 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1702 Trouble Code For Specific Cars

C1702 Moretti 1200 Battery Saver Relay Coil Circuit Short To Battery
C1702 Marcos Lm Transmission 4WD Mode Select Return Input Circuit Failure
C1702 Talbot Sunbeam-lotus Mirror Passenger Right Circuit Open
C1702 Suzuki Verona Mirror Driver Up Circuit Open
C1702 Bristol 403 Cooling Fan Power/Ground Circuit Malfunction
C1702 Hyundai Equus SCP (J1850) Invalid or Missing Data for Antenna
C1702 Fiat Freemont Lamp Tail Output Circuit Failure