210
TROUBLESHOOTING
16) Inspect Engine Throttle Valve / Fuel Gas Flow Control Valve
[Check output]
1. Select "Engine throttle valve open position (code No. 15)" in the check mode of the board maintenance func-
tions. Then check the operation of the engine throttle valve by setting the valve to 500-step position (fully
opened position).
2. Select "Fuel gas flow control valve open position (code No. 16)" in the check mode of the board maintenance
functions. Then check the operation of the fuel gas flow control valve by setting the valve to 500-step position
(fully opened position).
17) Inspect Air / Fuel Ratio
Measure the engine exhaust air from the exhaust port with an O
2
meter or an exhaust gas concentration meter.
[Engine throttle valve]
1. Turn OFF the electric leakage breaker.
2. Disconnect the engine throttle valve relay connector
and measure resistance between each pair of termi-
nals of the stepping motor.
Motor coil resistance
Connector terminal
arrangement
(at the valve side)
Terminal No.
Standard value
(77 ℉ (25 ℃ ))
1 - 2 (White-Brown)
120 Ω
2 - 3 (Brown-Orange)
4 - 5 (Yellow-Red)
5 - 6 (Red-Blue)
1 - 3 (White-Orange)
240 Ω
4 - 6 (Yellow-Blue)
Engine throttle valve
[Fuel gas flow control valve]
1. Turn OFF the electric leakage breaker.
2. Disconnect the fuel gas flow control valve relay connec-
tor and measure resistance between each pair of termi-
nals of the fuel gas flow control valve.
Motor coil resistance
Connector terminal
arrangement
(at the valve side)
Terminal No.
Standard value
(77 ℉ (25 ℃ ))
1 - 2 (White-Brown)
120 Ω
2 - 4 (Brown-Orange)
5 - 7 (Yellow-Red)
7 - 8 (Red-Blue)
1 - 4 (White-Orange)
240 Ω
5 - 8 (Yellow-Blue)
Fuel gas flow control valve
Air/fuel ratio standard value
O
2
meter 3 ~ 10 % / 2,400 rpm (min
-1
)
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