Vehicle Engine Management Systems Honda Civic 6

Engine Management Systems — General Information
In order to reduce the level of emissions into the atmosphere of toxic components that enter the engine exhaust gases as a result of incomplete combustion of fuel, as well as to maintain engine efficiency and reduce...

Engine Management System Component Layout Diagram
Engine compartment layout diagram of engine management/emission control components (Civic) 1 - ECM/PCM with control connector (under the dashboard); 2 - Electrical Load Detector (ELD) (under the fuse box); 3 - Throttle...

Engine Management System Specifications
Characteristic Meaning Resistance of the SKR circuit, Ohm Civic 350÷700 Integra 500÷1000 CYP circuit resistance, Ohm Civic 350÷700 Integra 500÷1000 TDC circuit resistance, Ohm Civic 350÷700 Integra 500÷1000 Resistance...

On-Board Diagnostics (OBD) System — Operating Principle and Error Codes
Information about diagnostic devices The proper functioning of injection system components and exhaust gas toxicity reduction systems is checked using a universal digital meter (multimeter). Using a digital meter is...

Removal and installation of PCM / ECM
Warning! Most models covered in this manual are equipped with the SRS system. Before performing any work near the air bag unit, steering column or instrument panel, turn off the SRS to avoid injury from accidental...

Checking and replacing the throttle position sensor (TPS)
Examination 1. Follow the wiring harness from the TPS to the rear of the intake manifold and remove it from the engine compartment bulkhead to provide additional work space to check the tightness of the connectors....

Checking and replacing the absolute pressure sensor in the pipeline (MAP)
Examination 1. Check the reliability of the connection to the sensor of the electrical connector. Assess the reliability of the terminals and the condition of the electrical wiring. If necessary, carry out the...

Checking and replacing the intake air temperature (IAT) sensor
Examination 1. With the ignition on, disconnect the wiring from the IAT sensor located on the intake manifold (see accompanying illustration). Using an ohmmeter, measure the resistance between the two terminals on the...

Checking and replacing the engine coolant temperature sensor (ECT)
Examination 1. The ECT sensor is a thermistor (a resistor whose resistance changes with temperature). Changing the resistance of the sensor has a direct effect on the amplitude of the signal sent by the sensor to the...

Checking and replacing the TDC/Crankshaft Position/Piston Position Sensor (TDC/CKP/CYP)
In the models under consideration, the crankshaft position sensor structurally consists of three parts, which monitor, respectively, the actual position of the shaft, the position of the engine TDC (tDC sensor) and the...

Checking and replacing the crankshaft fluctuation sensor (CKF)
The CKF sensor consists of a pulsation rotor located on the front crankshaft journal and an induction sensor assembly mounted on the engine near the rotor. The ECM/PCM uses the information from the CKF sensor to...

Checking and replacing the electrical load detector (ELD)
The ELD system detects signs of overload of the electrical circuits of the external lighting and signaling devices, fuel injection, charging, etc. The first symptom of such overloads is a disruption in the stability of...

Checking and replacing the pressure switch in the power steering system (PSP)
The PSP switch is used on models manufactured for the US market and is a normally closed switch. The switch is included in the hydraulic line and is located near the rack and pinion housing. When the steering wheel is...

Checking and replacing the oxygen sensor (λ-probe)
The λ-probe located in the engine exhaust manifold monitors the oxygen content in the exhaust gas flow. When O2 molecules come into contact with the sensitive element of the probe, the sensor generates an amplitude...

Checking the condition and replacing the knock sensor
Caution: Wait until the engine has cooled down completely before removing the oxygen sensor. The knock sensor responds to increased engine vibration intensity, usually caused by detonation of the air-fuel mixture. Based...

Checking and replacing the vehicle speed sensor (VSS)
The VSS is mounted on the transmission housing and is a sensor with variable magnetic resistance that begins to generate voltage pulses as soon as the vehicle speed exceeds 4.8 km/h (3 miles per hour). The pulses from...

Idle Speed Control System — IAC Valve Check and Replacement
General information When the engine is idling, the air-fuel mixture is controlled by the Idle Air Control (IAC) system. On Civic models, the system consists of a PCM and an IAC valve, on Integra models, it consists of a...

Checking and replacing the fast idle speed (FIT) temperature sensitive valve
The FIT valve is installed on some vehicle models and is used to increase idle speed by introducing additional air into the intake manifold during engine warm-up. Examination 1. When starting the test, the engine must...

Intake Air Bypass System — Checking and Replacing the IAB Valve Diaphragm
General information Some models are equipped with the IAB system, which allows the air sucked into the engine to be bypassed into the combustion chamber. The intake manifold on such models is equipped with two air...

Controlled Crankcase Ventilation (PCV) System
The PCV system serves to reduce emissions of hydrocarbon compounds into the atmosphere by removing crankcase gases. Blowing is carried out by circulating fresh air coming from the air cleaner through the crankcase,...

Exhaust Gas Recirculation (EGR) System — Component Checking and Replacement
General information In order to reduce the emission of nitrogen oxides into the atmosphere, part of the exhaust gases are returned to the intake manifold through the EGR valve. Such mixing of exhaust gases into the...

Evaporative Emissions (EVAP) System — Component Testing and Replacement
General information The system accumulates fuel vapors that accumulate while the vehicle is parked and ensures that they are discharged into the intake manifold for combustion during normal engine operation. Any EVAP...

Catalytic Converter — Checking Condition and Replacement
Note. To avoid violating the warranty obligations that apply to components of exhaust gas reduction systems, check and maintain the catalytic converter in the workshop of a car service station. General information A...

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