Primary Heated Oxygen Sensor (Ho2S) - Acura Integra 1998 Service Manual

Integra 1998

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Primary Heated Oxygen Sensor (HO2S) lsensor 1l

The Heated Oxygen Sensor {HO2S) detects the oxygen content in the exhaust gas and signals the ECM. In operation, the

ECM receives the signals from the sensor and varies the duration during which fuel is iniected. To stabilize the sensor,s

output, the sensor has an internal heater and the sensor element is coated with a catalyst. The HO2S is installed in TWC

housing (818C'1, 818C5 engines) or exhaust pipe B {81881 engine).

Thescantool indicates Diagnostic Trouble Code IDTCI PO13l: A low voltage problem in the primary

Heated Oxygen Sensor (HO2S) (Sensor 1) circuit.

Th6 MIL h.r baan.ago.t.d on.

DTC m131 it 3to..d.

Problcm vcrificrtion:

1. Do the ECM Reset Procedure.

2 . S t a r t t h e e n g i n o . H o l d t h e

engane at 3,000 rpm with no

load lin Park or neutral) until

th€ radiator Ian cofies on.

3. Test-drive with the A,/T in E

position, M/T in 4th gear.

4. Check the Primary flO2S {S€n-

sor 1) output voltage with the

scan tool during acceleration

using wide open throttle.

Intarmittcnt f.ilur., 3yatam b OK

.t thia tima. Ch.ck for poor con.

nrctiona or loosa wiraa at C113

(Prim.ry HO2S ls.n.or lll rnd

Chock the fuel pres6ure (see psge

1 1 - ' t 1 8 ) .

{To page 11-68)

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