Suzuki Liana RH418 Supplementary Service Manual page 82

1A-69 Engine General Information and Diagnosis:
Step
12 Check vehicle speed signal circuit
1) Turn ignition switch OFF position.
2) Disconnect connector from TCM.
3) Turn ignition switch to ON position, without running
engine.
4) Measure voltage from terminal "PPL" wire of TCM
connector to ground.
Is voltage more than 4 V?
13 Check vehicle speed signal circuit for short
1) Turn ignition switch OFF position.
2) Disconnect connector from ECM and combination meter.
3) Turn ignition switch ON position without engine running.
4) Measure voltage from terminal "PPL" wire of TCM
connector to ground.
Is voltage 0 V?
14 Check VSS and its circuit
1) Check VSS and its circuit referring to "Vehicle Speed
Sensor (VSS) and Its Circuit Inspection in Section 1C in
related manual".
Is it result satisfactory?
15 Check vehicle speed signal circuit for short
1) Turn ignition switch OFF position.
2) Disconnect connector from combination meter.
3) Turn ignition switch ON position without engine running.
4) Measure voltage from terminal "PPL" wire of TCM
connector to ground.
Is voltage 4 – 5 V?
Action Yes
Go to Step 13.
Go to Step 14.
Go to Step 15.
Faulty speedometer.
No
Go to Step 15.
"PPL" wire shorted to
power supply.
Repair or replace for
VSS and its circuit.
"PPL" wire open or
shorted to ground.
Substitute a known-
good ECM and recheck.