Troubleshooting With Self-Diagnostic Code - Suzuki DF70A Service Manual

Troubleshooting
Step
1 Is operation of the main relay heard when the ignition switch
is turned "ON"?
2 Are the main fuses (40 amp. and 30 amp.), (for Ignition and
ECM), and the sub battery cable fuse (15 amp.) in good
condition?
3 1) Disconnect the ECM connector at the ECM with the
ignition switch "OFF".
2) Measure the voltage between the No. 35 terminal of the
ECM connector and body ground.
Is the voltage 12 V (Battery Voltage)?
4 1) Turn the ignition switch "OFF".
2) Connect the 36 pin test cord set between the ECM and
the main wire harness.
3) Turn the ignition switch "ON".
4) Measure the voltage between the No. 36 terminal and
body ground, and the No. 15 terminal and body ground.
Is the voltage 12 V (Battery Voltage)?
5 1) Turn the ignition switch "OFF".
2) Connect the 36 pin test cord set between the ECM and
the main wire harness.
3) Turn the ignition switch "ON".
4) Measure the voltage between the No. 35 terminal and
body ground.
Is the voltage approx. 0.5 V?
6 1) Turn the ignition switch "ON".
2) Measure the voltage between the No. 12 terminal and
body ground.
Is the voltage 12 V (Battery Voltage)?

Troubleshooting with Self-Diagnostic Code

WARNING
!
Before troubleshooting, read and follow the "Precautions on Engine Diagnosis" (Page 1A-1).
In this section, troubleshooting procedures are based on the assumption that the "low pressure fuel system" and
"mechanical components (power unit, lower unit, etc.)" are normal.
Action
Engine General Information and Diagnosis:
Yes
Go to step 4.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
ECM power and ground
circuit are in good
condition.
1A-21
No
Go to step 2.
Replace.
• Check the ECM main
relay.
Refer to "ECM Main
Relay Inspection"
(Page 1A-42).
• Poor ECM main relay
connection.
• R/B wire open,
shorted or poor
connection.
• Check the ignition
switch. Refer to
"Ignition Switch
Inspection" in Section
1I (Page 1I-13).
• Gr, B/Bl, B/G wire
open circuit or poor
connection.
• R/B wire open,
shorted or poor
connection.
• If the wiring and
connection is OK,
intermittent trouble or
a faulty ECM may be
the cause.
• Gr wire open, shorted
or poor connection.
• Faulty ECM main
relay.
Z9J0111104002