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12 CHECK HEATED OXYGEN SENSOR 1 (FRONT)
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 63 [HO2S1 (B1) signal] or 62 [HO2S1 (B2) signal] and engine ground.
3. Check the following with engine speed held at 2,000 rpm constant under no load.
SEF967XA
CAUTION:
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
OK or NG
OK © GO TO 14.
NG © GO TO 13.
13 REPLACE HEATED OXYGEN SENSOR 1 (FRONT)
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 1 (front) harness protector color.
SEC020C
© Replace malfunctioning heated oxygen sensor 1 (front).
14 CHECK HO2S1 (FRONT) SHIELD CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect joint connector-17 or joint connector-18.
3. Check the following.
I Continuity between joint connector terminal 1 or 2 and ground
I Joint connector
(Refer to EL-525, “HARNESS LAYOUT”.)
Continuity should exist.
4. Also check harness for short to power.
5. Then reconnect joint connector-17 or joint connector-18.
OK or NG
OK © GO TO 15.
NG © Repair open circuit or short to power in harness or connectors.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0133 (BANK 1), P0153 (BANK 2) HO2S1 (FRONT) (RESPONSE
MONITORING)
Diagnostic Procedure (Cont’d)
EC-229
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