Acura 3.5 RL Manual page 423

Troubleshooting Flowchart
Inspection of Fuel Pressure Regu-
lator Control Solenoid Valve.
Check for vacuum at idle:
1. Start the engine. Hold the
engine at 3,000 rpm with no
load (in Park or neutral) until
the radiator fan comes on.
2. Disconnect the No. 1 vacuum
hose from the fuel pressure
regulator and connect a vac-
uum gauge to the hose.
Is there manifold vacuum?
YES
Check the Fuel Pressure Regula-
tor Control Solenoid Valve:
1. Turn the ignition switch OFF.
2. Disconnect the 4P connector
from the control box.
3. Connect battery positive to
terminal No. 4 and battery
negative to terminal No. 3 on
the 4P connector.
4. Start the engine and allow it
to idle.
Is there manifold vacuum?
NO
(To page 11-138)
NO
Disconnect the 4P connector
from the control box.
Is there vacuum?
YES
Inspect for a short to ground in
wire between PCM (A10) and the
4P connector. If the wire is OK,
substitute a known-good PCM
and recheck (see page
immobilizer information). If symp-
tom goes away, replace the orig-
inal PCM.
YES
Replace the fuel pressure regula-
tor control solenoid valve.
No. 1 VACUUM HOSE
FUEL
PRESSURE
REGULATOR
NO
11-42 for
VACUUM
PUMP/GAUGE, 0 - 30 in.Hg
A973X - 041 - XXXXX
Check the No. 1 and No. 3 vacu-
um hose. If hoses are OK, replace
the fuel pressure regulator con-
trol solenoid valve.
CONTROL BOX
4P CONNECTOR
Terminal side of male
terminals