Honda Civic Service Manual page 433

The scan tool indicates Diagnostic Trouble Code (DTC) Pl167: A system malfunction in the Primary Heated
Orygen Sensor {Primary HO2S) (Sensor 1) Heater circuit
PRIMABY HO2S ISENSOR 1} 8P CONNECTOR
tc145l
ECM CONNECTOR C (31P)
-
The MIL has be€n reported on.
-
DTC Pl167 i3 3tored.
Problem Veritication:
1. Do the ECM Reset Procedure.
2 . S t a r t t h e e n g i n e . H o l d t h e
engine at 3,000 mm with no
load (transmission in neutral)
until the radiator fan comes
o n .
Intormittont failure, system i3 OK
at thia time. Chock for Poor con_
noction3 or looso wilgt ai Cl45
(Primary HO2S, Son3or 1l and
ECM.
ls DTC1167 indicated?
Check lor sn open in the wire
(VS+ linel:
1. Turn the ignition switch OFF
2. Disconnect the Primary HO2S
{Sensor 1) 8P connector.
3. Turn the ignition switch ON (ll).
4. Measure voltage betwe€n the
Primary HO2S (Sensor
'1) 8P
connector terminal No 6 and
body ground.
Ch.ck the ECM:
M e a s u r e v o l t a g e b e t w e e n t h e
ECM connector terminsl C25 and
body ground.
ls there more than 5 V?
Repair opon in the wite ECM (C25)
and P m.ry HO2S (S€n3or 11.
ls there more than 5 V?
Replaco the Primary HO2S (Son-
sor 11.
Substitute ! known-good ECM
and r6check. lf symptom/indica-
tion gos6 away, r.place tho origi'
nd ECM,
,l
2 3 4
5 8
9 1 0
1 1
12 1 3 t 4 1 5 1 6 1 7 1 8
a
21 25
a
30
VS+
{WHTI
Wire side of female
terminals
1 1 - 1 6 3