Yamaha YXR70FX Service Manual page 279

Diagnostic code table
Fault
Symptom
code No.
No normal signals are received from
12
the crankshaft position sensor.
Intake air pressure sensor: open or
13
short circuit detected.
Intake air pressure sensor: hose sys-
14 tem malfunction (clogged or detached
hose).
Throttle position sensor: open or short
15
circuit detected.
Stuck throttle position sensor
16
detected.
Coolant temperature sensor: open or
21
short circuit detected.
Intake air temperature sensor: open
22
or short circuit detected.
30 The vehicle has overturned.
Malfunction detected in the primary
33
lead of the ignition coil.
Engine speed is high when the
37
engine is idling.
39 Open circuit detected in a injector.
Lean angle sensor: open or short cir-
41
cuit detected.
No normal signals are received from
42
the speed sensor.
Power supply to the injector and fuel
43
pump is not normal.
Error is detected while reading or writ-
44 ing on EEPROM (CO adjustment
value).
Power supply to the fuel injection sys-
46
tem is not normal.
FUEL INJECTION SYSTEM
Probable cause of malfunction
• Open or short circuit in wire harness.
• Defective crankshaft position sensor.
• Malfunction in pickup rotor.
• Malfunction in ECU.
• Improperly installed sensor.
• Open or short circuit in wire harness.
• Defective intake air pressure sensor.
• Malfunction in ECU.
• Intake air pressure sensor hose is detached, clogged,
kinked, or pinched.
• Malfunction in ECU.
• Open or short circuit in wire sub lead.
• Open or short circuit in wire harness.
• Defective throttle position sensor.
• Malfunction in ECU.
• Improperly installed throttle position sensor.
• Stuck throttle position sensor.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective coolant temperature sensor.
• Malfunction in ECU.
• Improperly installed coolant temperature sensor.
• Open or short circuit in wire harness.
• Defective intake air temperature sensor.
• Malfunction in ECU.
• Improperly installed intake air temperature sensor.
• Overturned.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Malfunction in ignition coil.
• Malfunction in ECU.
• Malfunction in a component of ignition cut-off circuit sys-
tem.
• Open circuit in wire harness.
• Malfunction in throttle body.
• Malfunction in throttle cables.
• ISC valve is stuck fully open due to disconnected ISC
unit coupler. (High engine idle speed is detected with the
ISC valve stuck fully open even though signals for the
valve to close are continuously being transmitted by the
ECU.)
• Malfunction in ECU.
• Backup fuse is blown.
• Open or short circuit in wire harness.
• Improperly installed injector.
• Defective injector.
• Open or short circuit in wire harness.
• Defective lean angle sensor.
• Malfunction in ECU.
• Open circuit in wire harness.
• Defective speed sensor.
• Malfunction in vehicle speed sensor detected.
• Malfunction in the engine side of the neutral switch.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Malfunction in ECU.
• Malfunction in ECU. (The CO adjustment value is not
properly written on or read from the internal memory).
• Malfunction in the charging system. Refer to "CHARG-
ING SYSTEM" in chapter 9.
6 - 9
FI
Diagnostic code No.
—
d03
d03
d01
d01
d06
d05
d08
d30
d54
d36
d08
d07
d09
d60
—