C1693 Diagnostic Trouble Code

C1693 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 C1693 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

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

Repair Processes :

Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the 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. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code C1693 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 C1693.

Fortunately, C1693 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1693 Trouble Code For Specific Cars

C1693 Humber Hawk Right Rear Center Sensor Circuit Short to Vbat
C1693 Fiat 125 Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)
C1693 Hyundai Clix SCAIR Solenoid Circuit Malfunction
C1693 Suzuki Xl-6 Mirror Driver Vertical Switch Circuit Open
C1693 Sunbeam 2-litres Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
C1693 Lincoln Neiman Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem
C1693 Bristol Britannia Crankshaft Position Sensor B Circuit High Input