Toyota 4A-FE Repair Manual page 160

Fl-146 EFI SYSTEM - Electronic Control System
CONTINUED FROM PAGE Fl-145
CD
®
(Repair the relevant diagnostic code. )
®
I
Disconnect the PCV hose.
Malfunction
code(s)
(Ex. code 21)
Read
and record
diagnostic codes.
(See pages Fl-28 to 31)
Normal code
and
code
21
i
Disconnect terminals TE1 and E1 of the check
connector. And maintain engine at 2,500 rpm.
Measure
voltage
between
terminals VF1 and E1 .
ov
5V
Measure voltage between terminals
VF1
and E1.
More
than 0 V
(~_R_e_p_ai_r_{_O_v_e_r_ri_c_h_)~~~~~~~~~_,)
Replace the oxygen sensor.
Disconnect the water temp. sensor connector and
connect resistor
with
a
resistance of
4 - 8 kfl
or
another coded water temp. sensor.
Connect
terminals
TE1 and El of the check connector.
I
r
i
Warm up the oxygen sensor with the engine at 2,500
rpm for approx. 90
seconds.
And maintain engine
speed at 2,500 rpm.
I
t
Measure voltage between terminals VF 1 and E 1 .
ov
5
v
Repair (Over lean)