Suzuki Liana RH418, Supplementary Service Manual

Page: 81 / 371

Engine General Information and Diagnosis: 1A-68
7 Check VSS signal circuit
1) Measure voltage from terminal “a” of VSS connector to
ground.
Is voltage more than 4 V?
Go to Step 8. “PPL” wire open or
short. Poor connection
of ECM connector
terminal.
If OK, substitute a
known-good ECM and
recheck.
8 Check VSS
1) Turn OFF ignition switch.
2) Remove VSS.
3) Remove metal particles on end face of VSS, if any.
4) Connect connector to VSS.
5) Turn ON ignition switch.
6) Check for voltage at terminal “G04-24” of connector
connected to VSS by passing magnetic substance (iron)
(1) while keeping approximately 1 mm (0.03 in.) gap with
respect to end face of VSS.
Does voltage vary from low (0 – 1 V) to high (4 – 5 V) or from
high to low?
Go to Step 9. Poor connection of VSS
connector terminal. If
OK, substitute a known-
good VSS and recheck.
9 Check VSS signal rotor
1) Turn OFF ignition switch.
2) Visually inspect VSS signal rotor for damage.
Was any damage found?
Faulty VSS signal rotor. Substitute a known-
good ECM and recheck.
10 Does speedometer indicate vehicle speed? Go to Step 11. Go to Step 12.
11 Check vehicle speed signal
1) Turn ignition switch to OFF position.
2) Disconnect combination meter connectors.
3) Turn ignition switch to ON position, without running
engine.
4) Measure voltage from terminal “PPL” wire of TCM
connector to ground.
Is voltage within 4 – 5 V?
Intermittent trouble or
faulty ECM check for
intermittent referring to
“Intermittent and Poor
Connection Inspection
in Section 00 in related
manual”. “PPL” wire open. Poor
connection of ECM
connector terminal.
If OK, substitute a
known-good ECM and
recheck.
Step Action Yes No
I2RH01110120-01
1
I3RH0A110025-01