Suzuki GRAND VITARA XL-7, Руководство по обслуживанию

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ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM) 6-43
TROUBLESHOOTING
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check Fuel Shortage
1) Is there enough fuel in fuel tank? Go to Step 3. Supply fuel into fuel
tank.
3 Check Wire Harness
1) With ignition switch OFF, disconnect ECM
connector.
2) Check for proper connection to ECM at C51-1
and C51-50 terminals.
3) If OK, check resistance between C51-1 and
C51-50 terminals.
Is resistance 2 – 3
Ω
?
Go to Step 4. 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.
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 C51-74
and C51-33 terminal at idle speed.
Is voltage about 1.3 V?
Go to Step 5. “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.
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?
D
Fuel line clogged.
D
Faulty fuel pressure
regulator.
If OK, substitute a
known-good ECM and
recheck. (See NOTE.)
Repair or replace.
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.