Suzuki 2000 Grand Vitara SQ625 Service Manual page 94

6-90 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
TROUBLESHOOTING (DTC P0500/DTC No.24)
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Does speedometer indicate vehicle speed?
3 VSS Power Supply Voltage Check:
1) With ignition switch OFF, remove VSS coupler.
2) With ignition switch ON leaving engine OFF, check
voltage between C20-3 and C20-2 terminal of VSS
coupler.
Is voltage 10 – 14 V?
4 VSS Signal Harness Check:
1) With ignition switch ON leaving engine OFF, check
voltage between C20-1 and C20-2 terminal of VSS
coupler.
Is voltage 4 V or more?
5 VSS Visual Inspection:
1) Remove VSS referring to "TRANSFER" section.
2) Check VSS drive and driven gears for damage and
excessive wear.
Are they in good condition?
6 Speedometer Circuit Check:
1) With ignition switch OFF, disconnect G11 coupler
from combination meter.
2) With ignition switch ON leaving engine OFF, check
voltage between C20-1 and C20-2 terminal of VSS
coupler.
Is voltage 4 V or more?
ACTION YES
Go to Step 2.
Faulty "Bl/Y" wire or
poor C51-2-25
connection.
If wire and connec-
tion are OK, intermit-
tent trouble or faulty
ECM (PCM).
Check for intermittent
referring to "Intermit-
tent and Poor Con-
nection" in Section
0A.
Go to Step 4.
Go to Step 5.
Poor VSS connection
or VSS malfunction.
If connection is OK,
substitute a known-
good VSS and
recheck.
Substitute a known-
good combination
meter and recheck.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to Step 3.
"B/Bl" or "B/Y" wire
open/short.
Go to Step 6.
Replace VSS.
"Bl/Y" wire open/
short or faulty ECM
(PCM).
If wire and connec-
tion are OK, substi-
tute a known-good
ECM (PCM) and
recheck.