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5.5 initial diagnostic check: efi - harley-davidson-sweden.se

5.5 initial diagnostic check: efi - harley-davidson-sweden.se

HOME NOTES 5-2 2004

HOME NOTES 5-2 2004 Touring: Engine Management (EFI)

HOME EFI SYSTEM 5.2 GENERAL The engine management system consists of the following components: ● ● ● ● ● ● ● ● ● ● Electronic control module (ECM). Crank position sensor (CKP). Manifold absolute pressure sensor (MAP). Intake air temperature sensor (IAT). Engine temperature sensor (ET). Idle air control (IAC). Throttle position sensor (TP). Vehicle speed sensor (VSS). Turn signal module (TSM) or optional, factory-installed turn signal security module (TSSM). This includes an integrated bank angle sensor (BAS). Ignition coil. The ECM is mounted under the electrical caddie cover (left side of vehicle). It computes the spark advance for proper ignition timing based on sensor inputs (from CKP, MAP and TP sensor) and regulates the low-voltage circuits between battery and ignition coil. The bank angle sensor is within the TSM/TSSM. If the vehicle lean angle exceeds 45 degrees for one second, the fuel pump is shut off. Once the sensor is tripped, the motorcycle must be uprighted, turned off and then on again before the engine can be restarted. This is communicated across the data bus. Front and rear coils fire each spark plug independently (one cylinder at a time - no wasted spark). The coil also has an extra terminal to monitor current on the coil secondary circuit. This is used for knock detection and combustion diagnostics. The ignition system gives a spark near top dead center for starting. At RPM and loads above this, the system gives a spark advance that varies between 0° and 50°. The IAT, ET and TP sensors are used to provide information to the ECM to fine tune spark and fuel delivery. The VSS is used as an input for idle speed control. TROUBLESHOOTING See the diagnostic charts that follow for troubleshooting information. The ECM contains all of the solid state components used in the ignition system. The dwell time for the ignition coil is also calculated in the microprocessor and is dependent upon battery voltage. The programmed dwell is an added feature to give adequate spark at all speeds. (The ECM has added protection against transient voltages, continuous reverse voltage protection, and damage due to jump starts.) The ECM is fully enclosed to protect it from vibration, dust, water or oil. This unit is a non-repairable item. If it fails, it must be replaced. The crank position sensor (CKP) is located in the front left side of the crankcase. The CKP generates an AC signal which is sent to the ECM where it is used to reference engine position (TDC) and speed. It functions by taking readings off the 30 teeth on the left side flywheel (two teeth are missing to establish a reference point). The MAP sensor is located on top of the intake manifold. The MAP sensor monitors the intake manifold pressure (vacuum) and sends the information to the ECM where the module adjusts the spark and fuel timing advance curve for optimum performance. 2004 Touring: Engine Management (EFI) 5-3

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