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B: Heated oxygen sensor 1 (front) voltage switching fre-
quency
This ratio should be less than 0.75.
If the ratio is greater than above, it means three way catalyst
(Manifold) does not operate properly. Go to “Diagnostic
Procedure”, EC-359.
NOTE:
If the voltage at terminal 62 or 63 does not switch periodically more
than 5 times within 10 seconds at step 5, perform trouble diagno-
sis for “DTC P0133, P0153” first. (See EC-218.)
Diagnostic Procedure
NHEC0217
1 CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent.
OK or NG
OK © GO TO 2.
NG © Repair or replace.
2 CHECK EXHAUST AIR LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust air leak before the three way catalyst (Manifold).
SEF099P
OK or NG
OK © GO TO 3.
NG © Repair or replace.
3 CHECK INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK © GO TO 4.
NG © Repair or replace.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0420 (BANK 1), P0430 (BANK 2) THREE WAY CATALYST FUNCTION
Overall Function Check (Cont’d)
EC-359
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