Honda Acura NSX 1991 Service Manual page 208

PGM-FI Control System
Troubleshooting Flowchart - Oxygen Sensor Heater
Self-diagnosis Check Engine light indicates code 42: A problem in the Rear Oxygen (02) Sensor
with service
reported on,
check connector
( p a g e ll-18), C O D E 4 1
Do the ECU Reset Procedures
(page 11-19).
Y E S
Stop the engine
Disconnect the 4P connector
from the 02 sensor.
Measure resistance between ter-
minals C and D on the Oz sensor.
(Page 1 l-33)
jumped
Intermittent
system is OK at this
time (test drive may be
necessary).
Check for poor con-
nections or loose wires
at 02 sensor C144,
Cl48 and ECU.
FRONT:
failure,
REAR:
DIGITAL MULTIMETER
KS-AHM-32-003
MULTIMETER
I O - 2 0 0