Honda Civic Service Manual page 431

Heated Oxygen Sensor (HO2SI Heater (Dl6Y5 engine with M/Tl
The scan tool indicates Diagnostic Trouble Code (DTC) P1166: An electrical problem in the Primary Heated
Oxygen Sensor (Primary H02S) Heater system.
PRIMABY HO2S ISENSOR 1I 8P CONNECTOR
Terminal side of
male terminals
I
(cont'd)
1 1 - 1 6 1
-
The MIL has been lePorted
-
DTC Pl166 b stored.
Problem verilication:
1. Do the ECM Reset Procedure.
2. Start the engine.
Intermitlent failura, sYstem b OK
at this time (te3t drive maY be
ngcessary). Check for poor con-
nections or loose wires between
C145 (Primary HO2S, Sen3or 1l
end ECM.
ls DTC P'l166 indicated?
Check the Primary HO2S (Sensot
1l resistence:
1. Turn the ignition switch OFF
2. Disconnect the Primary HO2S
(Sensor 1) 8P connector.
3 . A t t h e P r i m a r y H O 2 S ( S e n
s o r 1 ) , m e a s u r e r e s i s t a n c e
between No. 1 and No. 2 ter_
Replace lhe Primery HO2S (Sen-
sor 11.
ls there 2 13 O?
C h e c k f o r a s h o r t e d P r i m a r Y
HO2S lsensor 1):
C h e c k f o r c o n t i n u i t y b e t w e e n
body ground and each terminal.
C h e c k f o r a s h o r t e d P r i m a r Y
HO2S {S€nsor 1l:
Check for continuity between ter'
m i n a l N o . 1 a n d t e r m i n a l s N o . 3 ,
4, 6, 7 and 8 individually.
l s t h e r e c o n l r n u i l y ?
( T o p a g e 1 1 ' 1 6 2 )