C1789 Trouble Code

View C1789 obd/2 error code description and symptoms. C1789 engine photo

Variable Cam Timing Over-advanced (Bank 1) The comprehensive component monitor (CCM) monitors the VCT position for an over-advanced camshaft timing.
The test fails when the camshaft timing exceeds a maximum calibrated value or remains in an advanced position. Cam timing improperly set No oil flow to the VCT piston chamber Low oil pressure VCT solenoid valve stuck closed Camshaft advance mechanism binding (VCT unit) C1789 DTC is a check of the VCT unit.

As long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

C1789 Error Code Repair Process :

If your vehicle failed a C1789 test and the C1789 Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses injection pump fuel metering control a malfunction (cam/rotor/injector) a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look injection pump fuel metering control a malfunction (cam/rotor/injector): Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature.

C1789 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Common Causes of C1789

A common cause of code C1789 is the failure of Injection Pump Fuel Metering Control A Malfunction (Cam/Rotor/Injector), but there are several other possible causes as well, such as ;

Camshaft advance mechanism binding (VCT unit)
Damaged VCT phaser
Incorrect Positive Crankcase Ventilation (PCV) hose connection
Faulty Intake Valve Timing Control Solenoid Valve

C1789 code for all cars

You can view according C1789 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+C1789 Toyota Caserta

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