Yamaha PZ50W Service Manual page 270

Fault
Symptom
code No.
Power supply to the fuel
46 injection system is not nor-
mal.
Faulty ECU memory. (When
this malfunction is detected in
50 the ECU, the fault code num-
ber might not appear on the
meter.)
Knock sensor: open or short
circuit detected.
65
Grip warmer: open or short
81 circuit detected.
Thumb warmer: short circuit
83 detected.
Conditions requiring T.O.R.S.
operation are detected.
84
Oil pressure switch: open cir-
85 cuit detected.
Drive position switch: short
circuit detected.
88
Reverse position switch:
short circuit detected.
No signals are received from
the ECU.
Er-1
No signals are received from
Er-2 the ECU within the specified
duration.
Data from the ECU cannot be
Er-3 received correctly.
Non-registered data has been
Er-4 received from the meter.
FUEL INJECTION SYSTEM
Probable cause of malfunction
• Malfunction in the charging system. (Refer to "CHARGING SYS-
TEM" in CHAPTER 8.)
• Malfunction in ECU. (The program and data are not properly
written on or read from the internal memory.)
• Open or short circuit in wire harness.
• Defective knock sensor.
• Malfunction in ECU.
• Improperly installed knock sensor.
• Open or short circuit in wire harness.
• Defective grip warmer.
• Malfunction in ECU.
• Short circuit in wire harness.
• Defective thumb warmer.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective throttle position sensor.
• Defective throttle switch.
• Defective speed sensor.
• Malfunction in ECU.
• Improperly installed throttle position sensor.
• Open circuit in wire harness.
• Defective oil pressure switch.
• Malfunction in ECU.
• Short circuit in gear motor sub-wire harness.
• Short circuit in wire harness.
• Defective drive position switch.
• Malfunction in ECU.
• Improperly installed drive position switch.
• Short circuit in gear motor sub-wire harness.
• Short circuit in wire harness.
• Defective reverse position switch.
• Malfunction in ECU.
• Improperly installed reverse position switch.
• Open or short circuit in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
• Defective wire connection of the ECU coupler.
• Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
• Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
• Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
7-10
FI
Diagnostic code No.
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26
27
01
07
24
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