Honda 1986 GoldWing GL1200A Manual page 75

Backfire
Check the spark plugs before using this chart.
goo ry
u
y
LED's: Check LED's on ECU with engine
LED's ON
FAULTV PART: Inspect system or parts
running
indicated.
LED's OFF
J
Normal
•
Faulty ECU. Try with
a
known good ECU.
INJECTORS: Inspect each injector (see
Abnormal
page 10·20)
•
Faulty injector or wires.
Normal
FUEL PRESSURE: Check fuel pressure
Abnormal
•
Go to FUEL PRESSURE
lsee page 10·20).
TROUBLESHOOTING
Normal
(see page 10,9).
TIMING: Check ignition timing (see
Incorrect
SENSORS: Check ignition timing related
page 7-5).
sensors (PBR/PBL, Ns, ¢th, GRIGL , and TW
sensors).
Correct
~
Normal
•
Faulty ECU. Try with a known goodlECU.
HOSES: Check PB sensor hoses for
Abnormal
blockage with a vacuum pump (see
•
Follow procedures on page 1 0·1 8.
page 10·18).
Normal
AIR LEAKS: Check for leaky parts in
Leaking
intake system between throttle valve and
•
Too lean a mixture due to secondary
cylinder head. air leak.
Not Leaking
Not
Synchronized
THROTTLE VALVES: Inspect After
synchronization 01 throttle valves. Adjust
Adjustment
throttle valve synchronization it vacuums
•
Secondary air leak.
are different between # 1 , 3 cylinders and
•
Faulty throttle valve body.
#2, 4 cylinders (see page 3-5).
Synchronized
I
After
Adjustment
Synchronized
•
Incorrect throttle valve adjustment.
Loose or
Broken
Connector
WIRING: Check each sensor tor poor
or Wire
•
Poor contact at connector.
contact at connector or a broken wire.
•
Open or short circuit in harness.
I
Not Loose or Broken
•
Fa
It ECU. T with a known dIECU.
.-
(cont'd)
10-15