Acura 3.5 RL Manual page 424

Fuel Supply System
Fuel Pressure Regulator (cont'd)
(From page 11-137)
Check for an open in the wire
(IG1 line):
Measure voltage between the
control box 4P connector termi-
nal No. 4 and body ground.
Is there battery voltage?
YES
Check for an open in the wire
(FPRCS line):
1. Turn the ignition switch OFF.
2. Reconnect the 4P connector
to the control box.
3. Start the engine and allow it
to idle.
4. Connect PCM connector ter-
minal A10 and body ground
with a jumper wire.
Is there manifold vacuum?
NO
Fuel Pressure Regulator Control
Solenoid Valve is OK.
Repair open in wire between
NO
No. 20 ECU (PCM) (20 A) fuse in
the under-dash fuse/relay box
and the 4P connector.
YES
Repair open in wire between
PCM (A10) and the 4P connector.
CONTROL BOX
4P CONNECTOR (C257)
IG1
(BLK/YEL)
Wire side of female terminals
PCM CONNECTOR A (26P)
FPRCS
(RED/
GRN)
Wire side of female terminals
JUMPER
WIRE