Dtc P1138 (P0230) Fuel Pressure Regulator Circuit Malfunction - Suzuki Grand Vitara XL-7 Service Manual

DTC P1138 (P0230) FUEL PRESSURE REGULATOR CIRCUIT MALFUNCTION

WIRING DIAGRAM
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool.
3) Run engine at idle speed for 10 sec. and stop it. Then, turn ignition switch ON.
4) Check DTC and pending DTC by using scan tool.
TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check Wire Harness
1) Disconnect connector at fuel pressure regulator.
2) Check voltage between "YEL" terminal of regula-
tor connector and ground with ignition switch ON.
D Ignition switch ON: 10 – 14 V
D Ignition switch OFF: about 0 V
Is check result as specified?
3 Check Fuel Pressure Regulator
Check resistance between "YEL" and
"LT GRN/WHT" terminal of valve.
Is it between 2 and 3 Ω?
NOTE:
If DTC is checked using generic scan tool only and DTC P0191 (P0230)/P1112 (P0230) Diag. Flow Table is
not performed yet, go to the table before ECM replacement.
ENGINE DIAGNOSIS (RHZ ENGINE WITH TRIPLE-CONNECTOR ECM) 6-1-39
ACTION
1. Double relay
2. ECM
3. Fuel pressure regulator
YES
Go to Step 2.
Go to Step 3.
D "LT GRN/WHT" wire
open or shorted to
power /ground,
D Poor E228-14
connection
If wire and connection
are OK, substitute a
known-good ECM and
recheck. (See NOTE.)
NO
Go to "ENGINE DIAG.
FLOW TABLE".
"YEL" wire open or
shot to ground.
Faulty fuel pressure
regulator.