General Troubleshooting - Honda CBR650F Service Manual

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COMBINATION METER INDICATION WHEN THE SERIAL COMMUNICATION LINE IS ABNORMAL
If there is any problem in the serial communication line, the combination
meter shows following:
– MIL [1] stays on
– Tachometer [2] does not operate (though the engine is running)
– Odometer, tripmeter or fuel mileage meter [3] indicates "–" (while the
engine is running)
– High coolant temperature indicator [4] and HISS indicator [5] do not
come on
Serial communication line troubleshooting (page 21-8).
If there is any problem in the serial communication, the ECM stores the
DTC 86-1 (page 4-6).
PGM-FI TROUBLESHOOTING INFORMATION

GENERAL TROUBLESHOOTING

Intermittent Failure
The term "intermittent failure" means a system may have had a failure, but it checks OK now. If the MIL does not come on, check
for poor contact or loose pins at all connectors related to the circuit that of the troubleshooting. If the MIL was on, but then went out,
the original problem may be intermittent.
Opens and Shorts
"Opens" and "Shorts" are common electrical terms. An open is a break in a wire or at a connection. A short is an accidental
connection of a wire to ground or to another wire. In simple electronics, this usually means something will not work at all. With ECM
this can mean something may work, but not the way it's supposed to.
If the MIL has come on
Refer to DTC READOUT (page 4-6).
If the MIL did not stay on
If the MIL did not stay on, but there is a driveability problem, do the SYMPTOM TROUBLESHOOTING (page 4-8).
SYSTEM DESCRIPTION
SELF-DIAGNOSIS SYSTEM
The PGM-FI system is equipped with the self-diagnostic system. When any abnormality occurs in the system, the ECM turns on the
MIL and stores a DTC in its erasable memory.
FAIL-SAFE FUNCTION
The PGM-FI system is provided with a fail-safe function to secure a minimum running capability even when there is trouble in the
system. When any abnormality is detected by the self-diagnosis function, running capability is maintained by pre-programed value
in the simulated program map. When any abnormality is detected in the injector, the fail-safe function stops the engine to protect it
from damage.
DTC
• The DTC is composed of a main code and a sub code and it is displayed as a hyphenated number when retrieved from the ECM
with the MCS.
The digits in front of the hyphen are the main code, they indicate the component of function failure.
The digits behind the hyphen are the sub code, they detail the specific symptom of the component or function failure.
For example, in the case of the TP sensor:
– DTC 08-1 = (TP sensor voltage) – (lower than the specified value)
– DTC 08-2 = (TP sensor voltage) – (higher than the specified value)
• The MAP, ECT, TP and IAT sensor diagnosis will be made according to the voltage output of the affected sensor.
If a failure occurs, the ECM determines the Function Failure, compares the sensor voltage output to the standard value, and
then outputs the corresponding DTC to the MCS.
For example:
– If the output voltage line on the MAP sensor is opened, the ECM detects the output voltage is about 5 V, then the DTC 1-2
(MAP sensor circuit high voltage) will be displayed.
– If the input voltage line on the TP sensor is opened, the ECM detects the output voltage is 0 V, then the DTC 8-1 (TP sensor
circuit low voltage) will be displayed.
PGM-FI SYSTEM
[2]
(All indicators and segments displayed)
[3]
[1]
[4] [5]
4-5