ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-445
Check using oscilloscope
1. Disconnect the throttle position sensor connector and
connect the test harness special tool (MB991348) in
between.(All terminals should be connected.)
2. Connect the oscilloscope probe to the throttle position
sensor side connector terminal 3.
3. Turn the ignition switch "ON" position.
4. Slowly move the throttle lever from the idle position to the
full-throttle position and check then if the waveform is free
from any noise.
5. If any noise is recognized, replace the throttle position
sensor.
NOTE: After replacement, the throttle position sensor should
be adjusted. (Refer to
P.13A-437
.)
HEATED OXYGEN SENSOR CHECK
M1131005000099
Required Special Tools:
MB991658: Test Harness Set
MD998464: Test Harness
<Heated oxygen sensor (rear)>
1. Using scan tool MB991502, observe HO
2
S reading. If
values are unsatisfactory, or if Scan tool is not available, use
the following procedure:
(1) Disconnect the heated oxygen sensor connector and
connect special tool MB991658 to the connector on the
heated oxygen sensor side.
(2) Make sure that there is continuity [11-18
Ω
at 20
°
C
(68°
F)] between terminal 3 and terminal 4 on the heated
oxygen sensor connector
(3) If there is no continuity, replace the heated oxygen
sensor.
(4) Warm up the engine until engine coolant is 80
°
C (176
°
F
)
or higher
.
CAUTION
Be very careful when connecting the jumper wires;
incorrect connection can damage the heated oxygen
sensor.
(5) Use the jumper wires to connect terminal 3 of the heated
oxygen sensor connector to the positive battery terminal
and terminal 4 to the negative battery terminal.
(6) Connect a digital voltage meter between terminal 1 and
terminal 2.
2. While repeatedly revving the engine, measure the heated
oxygen sensor output voltage.
AKX01461AB
THROTTLE POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
1 2 3 4
AKX01462AB
NORMAL WAVEFORM
THROTTLE LEVER
FULL-THROTTLE
POSITION
THROTTLE
LEVER
IDLE
POSITION
AK000121AB
HEATED OXYGEN SENSOR
EQUIPMENT SIDE CONNECTOR
MB991658
AK000122
JUMPER
WIRES
MB991658
AB