Suzuki WagonR+ RB310 Service Manual page 702

Troubleshooting
Step
1 Was "Engine and Emission Control System
Check" performed?
2 Check vehicle speed signal.
Is vehicle speed displayed on scan tool in step
4) and 5) of DTC confirmation procedure?
3 Check power supply circuit.
1) With ignition switch turned OFF, disconnect
connector from VSS.
2) Check for proper connection for "BLK/RED",
"BRN" and "YEL" wire terminal.
3) If wires are OK, turn ON ignition switch,
measure voltage between engine ground
and "BLK/RED" wire terminal.
Is it voltage 10 – 14 V?
4 Check ground circuit.
1) Measure resistance between engine body
ground and "BRN" wire terminal with ignition
switch turn OFF.
Is resistance below 5
5 Check wire circuit.
1) Turn ON ignition switch, measure voltage
between engine ground and "YEL" wire ter-
minal at VSS connector. See Fig. 1.
Is it voltage 4 – 5 V?
6 Check ECM voltage.
1) Turn ON ignition switch, measure voltage
between vehicle body ground and "E22-19"
terminal at ECM connector.
Is it voltage 4 – 5 V?
7 Check short circuit.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Turn ON ignition switch, measure voltage
between engine ground and "E22-19" termi-
nal.
Is it voltage 0 V?
8 Check short circuit.
1) Measure resistance between engine ground
and "E22-19" terminal with ignition switch
turned OFF.
Is resistance infinity?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-131
Action
Ω ?
Yes
Go to Step 2.
Intermittent trouble or
faulty ECM.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection" in Section 0A.
Go to Step 4.
Go to Step 5.
Go to Step 9.
"YEL" wire open circuit.
Go to Step 8.
Go to Step 9.
No
Go to "Engine and Emis-
sion Control System
Check".
Go to Step 3.
"BLK/WHT" wire open cir-
cuit.
"BRN" wire open or high
resistance circuit.
Go to Step 6.
Go to Step 7.
"YEL" wire shorted to
power supply circuit.
"YEL" wire shorted to
ground circuit.
If wire are OK, substitute a
known-good ECM and
recheck.