Honda 954 Service Manual page 110

FUEL SYSTEM (Proarammed Fuel Iniection)
Do
not apply commercially available carburetor cleaners t o the inside of the throttle bore, which is coated with molybde-
num.
Do not snap the throttle valve from full open t o full closed after the throttle cable has been removed. It may cause incorrect
idle operation.
Seal the cylinder head intake ports with tape or a clean cloth t o keep dirt and debris from entering the intake ports after the
throttle body has been removed.
Do not apply excessive force t o the fuel pipe on the throttle body while removing or installing the throttle body.
Do not damage the throttle body. It may cause incorrect throttle and idle valve synchronization.
Prevent dirt and debris from entering the throttle bore, fuel hose and return hose, clean them using compressed air.
The throttle body is factory pre-set. Do not disassemble the throttle body in a way other than shown in this manual.
Do
not loosen or tighten the white painted bolts and screws of the throttle body. Loosening or tightening them can cause
throttle and idle valve synchronization failure.
Do not push the fuel pump base under the fuel tank when the fuel tank is stored.
Always replace the packing when the fuel pump is removed.
The programmed fuel injection system is equipped with the Self-Diagnostic System described o n page 5-6. If the malfunc-
tion indicator lamp (MIL) blinks, follow the Self-Diagnostic Procedures t o remedy the problem.
When checking the PGM-FI, always follow the steps in the troubleshooting flow chart (page 5-12 through 5-53).
The PGM-FI system is provided with a fail-safe function t o secure a minimum running capability even when there is no trou-
ble in the system. When any abnormality is detected by the self-diagnosis function, running capability is secured by mak-
ing use of the numerical values o f a situation preset i n advance i n the simulated program map. It must be remembered,
however, that when any abnormality is detected in the four injectors and/or the ignition and cam pulse generator, the fail
safe function stops the engine t o protect it from damage.
For PGM-FI system location, see page 5-4.
A faulty PGM-FI system is often related t o poorly connected or corroded connectors. Check those connections before pro-
ceeding.
For fuel reserve sensor inspection, see section 19.
The vehicle speed sensor sends digital pulse signals t o the ECM (PGM-FI unit) for computation. For vehicle speed sensor
inspection, see section 19.
When disassembling the programmed fuel injection parts, note the location of the O-rings. Replace them with new ones
upon reassembly.
Before disconnecting the fuel hose, release the fuel pressure by loosening the fuel hose banjo bolt at the fuel tank.
Always replace the sealing washers when the fuel hose banjo bolt is removed or loosened.
Use a digital tester for PGM-FI system inspection.
EGCV is the abbreviation of Exhaust Gas Control Valve.
SPECIFICATIONS
I
Throttle body identification
number
Starter valve vacuum difference
Base throttle valve for synchronization
Throttle grip free play
Intake air temperature sensor resistance (at 2OoC/68"F)
Engine coolant temperature sensor resistance (at 20"C/68"F)
Fuel injector resistance (at 20"C/68"F)
PAIR solenoid valve resistance (at 20°C/68"F)
Cam pulse generator peak voltage (at 20"C/68"F)
Ignition pulse generator peak voltage (at 20"C/68"F)
Manifold absolute pressure at idle
Fuel pressure at idle
5-2
ITEM
Except California type
Ca I ifo rn ia type
I
SPECIFICATIONS
1,200
-
2 6 mm (1/16
0.7 V m i n i m u m
0.7
I
150 - 250 mm Hn
343 kPa (3.5 kgf/cm2, 50 psi)
20
-
1/4 in)
2.3 - 2.6 k S Z
10.5 14.5
-
20 24 C2
-
V m i n i m u m