Suzuki GRAND VITARA Owner's Manual page 196

1A-141 Engine General Information and Diagnosis:
DTC Troubleshooting
WARNING
!
In order to reduce risk of fire and personal injury, this work must be performed in a well ventilated area
and away from any open flames such as gas water heater.
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions For DTC Troubleshooting: ".
Step
1 Was "Engine and Emission Control System Check"
performed?
2 EVAP canister purge power supply circuit check
1) Turn OFF ignition switch and disconnect connector from
EVAP canister purge valve.
2) Measure voltage between engine ground and "BLU/
BLK" wire terminal of EVAP canister purge valve
connector with ignition switch turned ON.
Is it voltage 10 – 14 V?
3 Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "C37-13" terminal of ECM
connector and vehicle body ground.
Is resistance infinity?
4 Wire circuit check
1) Measure voltage between "C37-13" terminal of ECM
connector and vehicle body ground with ignition switch
turned ON.
Is voltage 0 V?
5 Wire circuit check
1) Connect connector to purge control valve with ignition
switch turned OFF.
2) Turn ON ignition switch and measure voltage between
"C37-13" terminal of ECM connector and vehicle body
ground.
Is it voltage 10 – 14 V?
6 EVAP canister purge control valve check
1) Check EVAP canister purge control valve referring to
"EVAP Canister Purge Valve Inspection: in Section 1B".
Is it in good condition?
7 EVAP canister purge control circuit check
1) With ignition switch turn OFF, measure resistance
between "E23-1/16" terminal and "C37-13" terminal of
ECM connector.
Is resistance below 40
Action
Ω ° °
at 20 C, 68 F?
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Faulty ECM. Substitute
a known-good ECM and
recheck.
No
Go to "Engine and
Emission Control
System Check: ".
"BLU/BLK" wire is open
circuit.
"GRN/BLK" wire is
shorted to ground
circuit.
"GRN/BLK" wire is
shorted to other circuit.
"GRN/BLK" wire is open
circuit.
Faulty EVAP canister
purge control valve.
"GRN/BLK" and/or
"BLU/BLK" wire are high
resistance circuit.