Mitsubishi Galant (2004+). Manual - part 890
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-377
STEP 2. Check the cylinder 2, 3 heated oxygen sensor
(rear).
(1) Disconnect the cylinder 2, 3 heated oxygen sensor (rear)
connector B-35 and connect test harness special tool
MD998464 to the connector on the cylinder 2, 3 heated
oxygen sensor (rear) side.
(2) Warm up the engine until engine coolant temperature
reaches 80
°C (176°F) or higher.
(3) Perform a racing for 5 minutes or more with the engine
speed of 4,500 r/min.
(4) Connect a digital voltage meter between terminal No. 2
(black clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the cylinder
2, 3 heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 volt
CAUTION
• Be very careful when connecting the jumper wire;
incorrect connection can damage the heated oxygen
sensor (rear).
• Be careful the heater is broken when voltage of beyond
12 volts is applied to the heated oxygen sensor (rear)
heater.
NOTE: If the sufficiently high temperature [of approximate
400
°
C (752
°
F) or more] is not reached although the heated
oxygen sensor (rear) is normal, the output voltage would be
possibly low although the rich air/fuel ratio. Therefore, if the
output voltage is low, use a jumper wire to connect the ter-
minal No. 1 (red clip) and the terminal No. 3 (blue clip) of
the heated oxygen sensor (rear) with the positive terminal
and the negative terminal of 12 volts power supply respec-
tively, then check again.
Q: Is the measured voltage between 0.6 and 1.0 volt?
YES : Go to Step 3.
NO : Replace the cylinder 2, 3 heated oxygen sensor
(rear). Then go to Step 5.
AK303835
1
2
3
4
AB
CONNECTOR: B-35
B-35 (B)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (REAR)
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01624
HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR
MD998464
WHITE
BLACK
AL