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