31634-ZW1-003 Honda CLAMP, CABLE (Honda Code 4899191).

Electronic Control Circuit Diagram
Illustration 1 g03218336
Electronic control circuit diagram
Block Diagram
Illustration 2 is a block diagram of the control system on a C1.5T engine. Illustration 3 is a block diagram of the control system on a C2.2NA engine. Illustration 4 is a block diagram of the control system on a C2.2T engine.
Illustration 2 g03339577
Block diagram for the C1.5T engine
(1) Air cleaner
(2) Air inlet temperature sensor
(3) Aftertreatment Regeneration Device (ARD) air pump
(4) ARD glow plug relay
(5) Diesel Particulate Filter (DPF) differential pressure sensor
(6) ARD glow plug
(7) ARD combustion chamber temperature sensor
(8) Turbocharger
(9) ARD combustion chamber
(10) Diesel Oxidation Catalyst (DOC) and DPF
(11) DOC intake temperature sensor
(12) DPF intake temperature sensor
(13) DPF outlet temperature sensor
(14) Boost pressure sensor
(15) ARD body
(16) ARD injector No.1
(17) ARD injector No.2
(18) Injector leak-off return line
(19) Coolant temperature sensor
(20) Primary speed/timing sensor
(21) Electronic Control Module (ECM)
(22) Engine
(23) Oil pressure switch
(24) Engine glow plug relay
(25) HP fuel pump and fuel rack
(26) Fuel rack actuator
(27) Fuel rack position sensor
(28) Fuel lift pump
(29) Main fuel filter
(30) Fuel pre-filter (optional)
(31) Fuel strainer
(32) Fuel tank
(33) Fuel restrictor
Illustration 3 g03227857
Block diagram for the C2.2NA engine
(1) Air cleaner
(2) Air inlet temperature sensor
(3) Aftertreatment Regeneration Device (ARD) air pump
(4) ARD glow plug relay
(5) Diesel Particulate Filter (DPF) differential pressure sensor
(6) ARD glow plug
(7) ARD combustion chamber temperature sensor
(8) ARD combustion chamber
(9) Diesel Oxidation Catalyst (DOC) and DPF
(10) DOC intake temperature sensor
(11) DPF intake temperature sensor
(12) DPF outlet temperature sensor
(13) ARD body
(14) ARD injector No.1
(15) ARD injector No.2
(16) Injector leak-off return line
(17) Coolant temperature sensor
(18) Primary speed/timing sensor
(19) Electronic Control Module (ECM)
(20) Engine
(21) Oil pressure switch
(22) Engine glow plug relay
(23) HP fuel pump and fuel rack
(24) Fuel rack actuator
(25) Fuel rack position sensor
(26) Fuel lift pump
(27) Main fuel filter
(28) Fuel pre-filter (optional)
(29) Fuel strainer
(30) Fuel tank
(31) Fuel restrictor
Illustration 4 g03224676
Block diagram for the C2.2T engine
(1) Air cleaner
(2) Air inlet temperature sensor
(3) Aftertreatment Regeneration Device (ARD) air pump
(4) ARD glow plug relay
(5) Diesel Particulate Filter (DPF) differential pressure sensor
(6) ARD glow plug
(7) ARD combustion chamber temperature sensor
(8) Turbocharger
(9) ARD combustion chamber
(10) Diesel Oxidation Catalyst (DOC) and DPF
(11) DOC intake temperature sensor
(12) DPF intake temperature sensor
(13) DPF outlet temperature sensor
(14) Boost pressure sensor
(15) ARD body
(16) ARD injector No.1
(17) ARD injector No.2
(18) NOx Reduction System (NRS) valve
(19) NRS cooler
(20) Injector leak-off return line
(21) Coolant temperature sensor
(22) Primary speed/timing sensor
(23) Electronic Control Module (ECM)
(24) Engine
(25) Oil pressure switch
(26) Engine glow plug relay
(27) HP fuel pump and fuel rack
(28) Fuel rack actuator
(29) Fuel rack position sensor
(30) Fuel lift pump
(31) Main fuel filter
(32) Fuel pre-filter (optional)
(33) Fuel strainer
(34) Fuel tank
(35) Fuel restrictor System Operation
Engine Governor
The ECM governs the engine. The ECM determines the timing and the amount of fuel that is delivered to each cylinder. These factors are based on the actual conditions and on the desired conditions at any given time during starting and operation.The governor uses the throttle position sensor to determine the desired engine speed. The governor compares the desired engine speed to the actual engine speed. The actual engine speed is determined through interpretation of the signals that are received by the ECM from the engine speed/timing sensors. If the desired engine speed is greater than the actual engine speed, the governor injects more fuel in order to increase engine speed.
Illustration 5 g03227716
Typical example
The desired engine speed is typically determined by the position of the throttle.Customer Parameters and Engine Speed Governing
A unique feature with electronic engines is customer specified parameters. These parameters allow the owner of the machine to fine-tune the ECM for engine operation. Fine-tuning the ECM allows the machine owner to accommodate the typical usage of the machine and the power train of the machine.Many of the customer parameters provide additional restrictions on the actions that will be performed by the ECM in response to input from the operator.Some parameters are intended to notify the operator of potential engine damage (engine monitoring parameters). Some parameters enhance fuel economy (machine speed, engine speed limit, and idle shutdown). Other parameters are used to enhance the engine installation into the machine. Other parameters are used to provide engine operating information to the owner of the machine.ECM Lifetime Totals
The ECM maintains total data of the engine for the following parameters:
"Engine Hours"
"Engine Starts"
"Lifetime Total Engine Revolutions"The "Engine Hours" is the number of hours when electrical power has been applied to the engine. These hours will include the time when the ECM is powered but the engine is not running."Engine Starts" is the total number of times when the engine has been started."Lifetime Total Engine Revolutions" is the total number of revolutions that have been completed by the engine crankshaft.Programmable Parameters
Certain parameters that affect engine operation may be ch