Suzuki Grand Vitara XL-7 Service Manual page 161

6-1-22 ENGINE DIAGNOSIS (RHZ ENGINE WITH TRIPLE-CONNECTOR ECM)
TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check Fuel Shortage
1) Is there enough fuel in fuel tank?
3 Check Wire Harness
1) With ignition switch OFF, disconnect ECM
connector.
2) Check for proper connection to ECM at E228-2
and E228-14 terminals.
3) If OK, check resistance between E228-2 and
E228-14 terminals.
Is resistance 2 – 3 Ω?
4 Check Fuel Pressure Sensor Output Voltage
1) Remove ECM cover referring to "Voltage Check"
in the Section.
2) Connect fuel pressure sensor connector.
3) Start engine and check voltage between E228-6
and E227-32 terminal at idle speed.
Is voltage about 1.3 V?
5 Check Fuel Leakage
1) Perform step 1), 2) and 3) of "DTC
CONFIRMATION PROCEDURE".
2) Check fuel leakage on Fuel System.
Is it in good condition?
NOTE:
If DTC is checked using generic scan tool only and DTC P1138 (P0230) Diag. Flow Table is not performed
yet, go to the table before ECM replacement.
ACTION YES
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
D Fuel line clogged.
D Faulty fuel pressure
regulator.
If OK, substitute a
known-good ECM and
recheck. (See NOTE.)
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Supply fuel into fuel
tank.
Faulty "WHT/GRN"
wire, "YEL" wire or
"LT GRN/WHT" wire.
If wire is OK, substitute
a known-good double
relay or injection pump
and recheck.
"ORN /WHT" wire
open, "ORN/WHT"
wire shorted to ground
circuit/power circuit.
Poor fuel pressure
sensor connector
terminal connection.
If wire and connection
are OK, substitute a
known-good fuel
pressure sensor and
recheck.
Repair or replace.