B0120 Toyota Cynos Diagnostic Trouble Code

B0120 Toyota Cynos code definition:
B0120 is a kind of OBD-II Diagnostic B-Body Diagnostic Trouble Code for Toyota Cynos.

B0120 Toyota Cynos is defined as Ignition Coil B Primary/Secondary Circuit Malfunction.This code is a generic trouble code, meaning it applies to all vehicles equipped with OBD-II tool, or vehicles made since 1996 up to present. If the car doesn't start, they will proceed by testing the voltage at the fuel pump connector and see if the fuel pump relay, fuse, and PCM circuitry should be inspected.

Symptoms

Symptoms of a B0120 Toyota Cynos diagnostic trouble code may include:
Place of B0120 in engine

Possible Causes :

  • A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
  • Faulty IMRC actuator/sensor
  • Faulty IMRC actuator relay (if equipped)

Common Misdiagnoses

  1. TP Sensor Learn Not Complete Problem
  2. Low Coolant Circuit Problem
  3. Cruise Control System - Vehicle Accel Too High Problem
  4. TFP Valve Position Switch-Drive Without Drive Ratio Problem
  5. Problem

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code B0120 Toyota Cynos 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 B0120 Toyota Cynos.

Fortunately, B0120 Toyota Cynos is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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