Honda HR-V: PGM-FI System Description - Injection Control

Fuel injection controls include fuel injection amount control, fuel cut control and fuel pump control. Adopting PGM-FI (programmed-fuel injection) technology enables accurate fuel controls, which contributes to increased engine power and decreased fuel consumption.

Fuel Injection Duration

The fuel injection duration is determined by adding correction values to a basic injection duration. The powertrain control module (PCM) controls the amount of fuel injection by the length of time the injector is energized.

Fuel Injection Timing

The fuel injection timing is determined by the PCM, which calculates the injection time for each cylinder based on the signals sent from the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor. The PCM then controls the time to energize the injector.

CKP Sensor

The CKP sensor is attached to the oil pan. Each of the 58 teeth on the crankshaft pulse plate passes over it, a pulse signal is delivered to the PCM.

CMP Sensor

The camshaft position (CMP) sensor is attached to the cylinder head. Every time one of the three protrusions of the camshaft pulley passes over it, a pulse signal is delivered.

Fuel Injector

The fuel injector for a gaseous fuel supply has multiple holes. The nozzle with multiple holes increases the fuel atomization and improves the mixing with the surrounding air. When the coil in the injector is energized, the plunger is pulled in. The needle valve, which is integral with the plunger, is pulled on full. Then, the injector sprays the pressurized fuel which is controlled by the fuel pressure regulator.

MAF Sensor/IAT Sensor

The mass air flow (MAF) sensor/intake air temperature (IAT) sensor contains a hot wire, a cold film, and a thermistor. The sensor is in the intake air passage. The resistance of the hot wire, the cold film, and the thermistor changes due to intake air temperature and air flow. The control circuit in the MAF sensor controls the current to keep the hot wire at a set temperature. The current is converted to voltage in the control circuit, then sent as an input to the PCM.

PGM-FI SYSTEM DESCRIPTION - OBD

Overview

The on-board diagnostic detects failures in the emission control system. If any of the failure items in the table is detected by it, the failure is notified to the driver via the MIL in the gauge control module. For details of the failure items, refer to the DTC troubleshooting index.

Two Drive Cycle Detection Method

When a malfunction occurs in the signal from a sensor or from another control unit in the first drive cycle, the powertrain control module (PCM) stores a Pending DTC. The MIL does not come on at this time. If the failure continues in the second drive cycle, the PCM stores a confirmed DTC and turns on the MIL.

HDS (Honda Diagnostic System)

The data link connector (DLC) is under the driver's side of the dashboard. The DLC is used to connect the HDS or other scan tool to the vehicle for system diagnosis and troubleshooting.

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