Yamaha MBK MW125 2014, Service Manual

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SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
9-5
EAS20116
SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
EAS31118
SELF-DIAGNOSTIC FUNCTION TABLE
EAS31259
COMMUNICATION ERROR WITH THE YAMAHA DIAGNOSTIC TOOL
EAS31120
DIAGNOSTIC CODE: SENSOR OPERATION TABLE
Fault code No. Item
12
Crankshaft position sensor: no normal signals are received from the crankshaft position
sensor.
13 Intake air pressure sensor: open or short circuit detected.
14 Intake air pressure sensor: system malfunction (clogged or detached).
15 Throttle position sensor: open or short circuit detected.
16 Throttle position sensor: stuck throttle position sensor is detected.
19
Sidestand switch: a break or disconnection of the blue/yellow lead of the ECU is detect-
ed.
21 Coolant temperature sensor: open or short circuit detected.
22 Intake air temperature sensor: open or short circuit detected.
24
O
2
sensor: no normal signals are received from the O
2
sensor.
30 Latch up detected.
37 Engine speed is high when the engine is idling.
39 Injector: open or short circuit detected.
41 Lean angle sensor: open or short circuit detected.
42 Speed sensor: no normal signals are received from the speed sensor.
44 EEPROM fault code number: an error is detected while reading or writing on EEPROM.
46 Charging voltage is abnormal.
50
Faulty ECU memory. (When this malfunction is detected in the ECU, the fault code num-
ber might not appear on the tool display.)
61 ISC (idle speed control) unit: open or short circuit detected.
79
Engine speed is high when the Engine is idling.
Deceleration is poor when the vehicle is ridden.
Bad condition of engine or sensor.
Fault code No. Item
Waiting for con-
nection ECU (engine control unit) internal malfunction (output signal error): signals cannot be
transmitted between the ECU and the Yamaha diagnostic tool.
Er-4
ECU (engine control unit) internal malfunction (input signal error): non-registered data
has been received from the Yamaha diagnostic tool.
Diagnostic
code No.
Item Meter display Procedure
01 Throttle position sensor sig-
nal
• Fully closed position 14–20 Check with throttle valve fully
closed.
• Fully open position 97–107 Check with throttle valve fully
open.