Troubleshooting Guide - Honda BF135A Manual

a. TROUBLESHOOTING GUIDE
MIL
No. of blinks MIL
OFF
MIL does
not come
ON
Stays ON ON
3 ON
4 ON
6 ON
7 ON
8 ON
10 ON
13 ON
14 ON
21 ON
23 ON
5-59
Detected unit
ECM
ECM
MAP (Sensor voltage)
CKP sensor (Pulse)
ECT sensor 1 (Sensor voltage)
TP sensor (Sensor voltage)
CMP sensor (Pulse)
IAT sensor (Sensor voltage)
BARO sensor (Sensor voltage)
IAC valve (Input/output current)
VTEC solenoid
(Output current)
(BF150A only)
Knock sensor (Sensor voltage)
Probable problem part
• Open circuit in MIL wire
• Blown MIL bulb
• Open circuit or poor grounding of ECM
ground wire
• Faulty ECM
• Open circuit in ECM power supply line
• Short circuit in data link connector wire
• Short circuit in MIL wire
• Short circuit in sensor power supply line
• Faulty ECM
• Open or short circuit in MAP sensor line
• Faulty MAP sensor
• Faulty ECM
• Open or short circuit in CKP sensor wire
• Faulty CKP sensor
• Faulty ECM
• Open or short circuit in ECT sensor 1 wire
• Faulty ECT sensor 1
• Faulty ECM
• Open or short circuit in TP sensor wire
• Faulty TP sensor
• Faulty ECM
• Open or short circuit in CMP sensor
• Faulty CMP sensor
• Faulty ECM
• Open or short circuit in IAT sensor wire
• Faulty IAT sensor
• Faulty ECM
• Short circuit in BARO sensor
• Faulty BARO sensor
• Faulty ECM
• Open or short circuit in IAC valve wire
• Faulty IAC valve
• Faulty ECM
• Open circuit or short circuit in VTEC solenoid wire
• Faulty VTEC solenoid
• Faulty ECM
• Open circuit or short circuit in knock
sensor wire
• Faulty knock sensor
• Faulty ECM
BF135A•BF150A
Ref. page
5-61
5-64
5-71
5-72
5-74
5-75
5-77
5-78
5-80
5-81
5-82
5-83