Suzuki DF 90 - TROUBLESHOOTING

ENGINE CONTROL SYSTEM 3-45
TROUBLESHOOTING
#
Before starting troubleshooting, read and follow the “PRECAUTION ON SYSTEM INSPECTION”
section on page 3-35.
In this section, troubleshooting procedures are based on the assumption that “low pressure fuel system” and
“mechanical components (power unit, lower unit, etc.)” are normal.
NOTE:
For troubleshooting of “Starter motor will not run”, see page 4-9.
CHART1 : SELF-DIAGNOSTIC CODE “3-4”
START
< Ignition switch “ON” >
Check “35” terminal voltage.
Is result OK? (See page 3-37)
< Ignition switch “ON” >
Check “29” terminal voltage.
Is result OK? (See page 3-37)
Possible cause :
• ECM failure
• Wire continuity / connection failure
YES
YES
ECM failure
NO
MAP sensor failure
NO
CHART2 : SELF-DIAGNOSTIC CODE “4-2”
START
< Ignition switch “OFF” >
Check CKP sensor resistance.
Is result OK? (See page 3-38)
Possible cause :
• ECM failure
• Wire continuity / connection failure
YES
CKP sensor failure
NO
NOTE:
If there is an open circuit of any of the connector wires, sen-
sor damage or any other malfunction, ignition timing will re-
main fixed at BTDC 5°.