Suzuki Liana RH418 Supplementary Service Manual page 72

1A-59 Engine General Information and Diagnosis:
DTC Troubleshooting
Step
1 Was "Engine and Emission Control System Check"
performed?
2 Check knock sensor signal
1) With engine running, check voltage from "C41-25"
terminal of ECM connector to body ground.
Is voltage about 1.23 – 3.91 V?
3 Check knock sensor output
1) Stop engine.
2) With ignition switch at OFF position, disconnect knock
sensor connector.
3) With ignition switch at ON position, check voltage from
"RED" terminal of knock sensor connector to body
ground.
Is it 4 – 5 V?
Action
I2RH0B110045-01
I2RH01110089-01
Yes
Go to Step 2.
Intermittent trouble or
faulty ECM. Recheck,
referring to "Intermittent
and Poor Connection
Inspection in Section 00
in related manual".
Faulty knock sensor.
Substitute a known-
good knock sensor and
recheck.
No
Go to "Engine and
Emission Control
System Check".
Go to Step 3.
"RED" wire open,
shorted to ground circuit
or poor "C41-25"
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.