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SEC902C
SEC903C
Overall Function Check
NFEC0953
Use this procedure to check the overall function of the warm-up
three way catalyst. During this check, a 1st trip DTC might not be
confirmed.
CAUTION:
Always drive vehicle at a safe speed.
WITH GST
NFEC0953S01
1) Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.
2) Stop vehicle with engine running.
3) Set voltmeters probes between ECM terminals 91 [heated oxy-
gen sensor 1 bank 1 signal], 92 [heated oxygen sensor 1 bank
2 signal] and engine ground, and ECM terminals 88 [heated
oxygen sensor 2 bank 1 signal], 90 [heated oxygen sensor 2
bank 2 signal] and engine ground.
4) Keep engine speed at 2,000 rpm constant under no load.
5) Make sure that the voltage switching frequency (high & low)
between ECM terminals 88 and engine ground, or 90 and
engine ground is very less than that of ECM terminals 91 and
engine ground, or 91 and engine ground.
Switching frequency ratio = A/B
A: Heated oxygen sensor 2 voltage switching frequency
B: Heated oxygen sensor 1 voltage switching frequency
This ratio should be less than 0.75.
If the ratio is greater than above, it means warm-up three way
catalyst does not operate properly. Go to “Diagnostic
Procedure”, EC-347.
NOTE:
If the voltage at terminal 92 or 91 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-228.)
Diagnostic Procedure
NFEC0954
1 CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent.
OK or NG
OK © GO TO 2.
NG © Repair or replace.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
Overall Function Check
EC-347
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