Suzuki Liana RH418 Supplementary Service Manual page 80

1A-67 Engine General Information and Diagnosis:
DTC Troubleshooting
Step
1 Was "Engine and Emission Control System Check"
performed?
2 Is vehicle equipped A/T?
3 Does speedometer indicate vehicle speed?
4 Check vehicle speed signal
Is vehicle speed displayed on scan tool in Step 2) and 3) of
"DTC Confirmation Procedure"?
5 Check VSS signal circuit
1) With turn OFF ignition switch, disconnect connector from
VSS.
2) Disconnect combination meter connectors.
3) Turn ON ignition switch, without running engine.
4) Measure voltage from terminal "a" of VSS connector to
ground.
Is voltage within 4 – 5 V?
6 Check VSS power supply
1) With turn OFF ignition switch, disconnect connector from
VSS.
2) Turn ON ignition switch, without running engine.
3) Measure voltage from "b" to "c" of VSS connector.
Is voltage within 10 – 14 V?
Action
I2RH01110120-01
I2RH0B110065-01
Yes
Go to Step 2.
Go to Step 10.
Go to Step 4.
Intermittent trouble or
faulty ECM.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section 00
in related manual".
Faulty speedometer.
Go to Step 7.
No
Go to "Engine and
Emission Control
System Check".
Go to Step 3.
Go to Step 6.
Go to Step 5.
"PPL" wire open or
short.
Poor connection of ECM
connector terminal.
If OK, substitute a
known-good ECM and
recheck.
"BLK/RED" or "BLK/
ORN" wire open or
short.