6-60
ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM)
1. Double relay
2. ECM
3. Fuel pressure regulator
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 flame 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
ACTION
YES
NO
1
Was “ENGINE DIAG. FLOW TABLE” performed?
Go to Step 2.
Go to “ENGINE DIAG.
FLOW TABLE”.
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?
Go to Step 3.
“YEL” wire open or
shot to ground.
3
Check Fuel Pressure Regulator
Check resistance between “YEL” and
“LT GRN / WHT” terminal of valve.
Is it between 2 and 3
Ω
?
D
“LT GRN / WHT” wire
open or shorted to
power / ground,
D
Poor C51-50
connection
If wire and connection
are OK, substitute a
known-good ECM and
recheck. (See NOTE.)
Faulty fuel pressure
regulator.
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.
