Honda SH125 Manual page 82

FUEL SYSTEM (Programmed Fuel Injection)
ITEM
Throttle body identifica- SH125
tion number SH150
Idle speed
Throttle grip free play
ECT sensor resistance (at 2OoC/68"F)
Fuel injector resistance (at 20°C /68"F)
Fuel pressure
Fuel p u m p flow (at 12 V)
SERVICE INFORMATION
GENERAL
SPECIFICATIONS
G Q M I A
GQM2A
1,500 f 100 min-' (rpm)
2
-
6 mm (0.08 - 0.24 in)
2.3
-
2.6 kC1
11.1
-
12.3 R
294 kPa (3.0 kgf/cm2, 43 psi)
22 cm3 (0.7 US 02.0.8 ImD
02)
minimum/lO seconds
Before disconnecting fuel feed hose, relieve pressure fr om the system (page 5-31).
Bending or twisting the control cable will impair smooth operation and could cause the cable t o stick or bend, resulting
in loss of vehicle control.
Work i n a well ventilated area. Smoking or allowing flames or sparks in the work area or where gasoline is stored can
cause a fire o r explosion.
Do not apply commercially available carburetor cleaner t o the inside of the throttle bore, which is coated wi t h molybde-
num.
Do not snap the throttle dru m fr om full open to full close after the throttle cable has been removed. It may cause incor-
rect idle operation.
Seal the intake manifold with tape or a clean cloth to keep dirt and debris f rom entering the intake port after the throttle
body has been removed.
Prevent dirt and debris from entering the throttle bore and fuel feed hose, clean them using compressed air.
The engine control module (ECM) is mounted o n the throttle body (the throttle body with the built-in ECM).
Do
not dis-
assemble the throttle body/ECM assembly. Replace the throttle body/ECM as an assembly when the it is faulty.
The throttle body/ECM assembly may be damaged if dropped. Also if a connector is disconnected when current is flow-
ing, the excessive voltage may damage the ECM. Always turn off the ignition switch before servicing.
The throttle body/ECM assembly is factory pre-set. Do not disassemble i n a way other than shown in this manual. Loos-
ening the white painted fasteners can cause throttle body/ECM malfunction.
The programmed fuel injection (PGM-FI) system is equipped with the Self-Diagnostic System described o n page 5-7. If
the malfunction indicator lamp (MIL) blinks, follow the Self-Diagnostic Procedures to remedy the problem.
When checking the PGM-FI, always follow the steps
in
the troubleshooting fl ow chart (page 5-1 1 or 5-22).
The PGM-FI system is provided with fail-safe function t o secure a min imum running capability even when there is any
trouble in the system. When any abnormality is detected by the self-diagnosis function, running capability is secured b y
making use of the numerical values of a situation preset i n advance i n the simulated program map. It must be remem-
bered, however, that when any abnormality is detected i n injector the fail safe function stops the engine f rom the stand-
point of protecting it.
A faulty PGM-FI system is often related to poorly connected or corroded connectors. Check those connections before
proceeding.
The vehicle speed sensor sends digital pulse signal t o the ECM (PGM-FI unit) and computation. Refer t o procedures for
vehicle speed sensor inspection (MIL trouble shooting:page 5-10 or DTC trouble shooting:page 5-19).
Use a digital tester for PGM-FI system inspection.
Refer t o page page 20-10 for fuel gauge/fuel level sensor inspection.
Refer t o page page 20-1 1 for coolant temperature gauge/ECT sensor inspection.
SPECIFICATIONS
TORQUE VALUES
Fuel pump retaining plate nut
Throttle body insulator band bolt
Engine coolant temperature (ECT) sensor
0 2 sensor
Bank angle sensor screw
12 N.m (1.2 kgf.m, 9 I b f W
See page 5-40
23 N.m (2.3 kgf.m, 17 Ibf.ft)
44 N.m (4.5 kgf.m, 32 Ibf.ft)
1.2 N.m (0.12 kgf.m, 0.9 Ibf.ft)
5-3