Honda Acura NSX 1991 Service Manual page 222

PG M - FI Control System
Self-diagnosis Check Engine light indicates code 4: A problem in the circuit of the CRANK A
I
I
I I
Self-diagnosis Check Engine light indicates code 9: A problem
,
,
The CRANK sensor determines timing for fuel injection and ignition of each cylinder and also detects engine RPM. The CYL sensor
detects the position of No. 1 cylinder for sequential fuel injection to each cylinder.
reported on.
jumped (page 11-18). CODE
4. 54, 8 andlor 68 are in-
dicated.
Do the ECU Reset Procedures
(page 11-19).
Disconnect the 8P
from the CRANK/CYL sensor.
(To page 1 l-47)
Flowchart -
iagnosis Check Engine light indicates code 59: A problem in the circuit of the CYL B Sensor.
CRANK PICK-UP
COIL 6
CYL PICK-UP
COIL A
Intermittent
system Is OK at this
tlme (test drive may be
necessary).
Check for poor con-
nections or loose wires
at CRANKICYL sensor
connector
ECU.
connector
in the circuit of the CYL A Sensor.
CRANK PICK-UP
\
COIL A
failure,
Cl48 and
Sensor.