Mash Seventy - Page 116

Chapter 4 EI system diagnosis Section 4 EI system troubleshooting
4—21
“ P0107” or “P0108
MAP & IAT SENSOR CIRCUIT MALFUNCTION
DETECTED CONDITION POSSIBLE CAUSE
☞
To read the flash code,with the EFI diagnostic
instrument
NOTE :
Note that atmospheric pressure varies depending on
weather conditions as well as altitude.
Take that into consideration when inspecting voltage
● Clogged vacuum passage between throttle body
And MAP & IAT Sensor.
● Air being drawn from vacuum passage between
throttle body and MAP & IAT Sensor.
● MAP & IAT Sensor circuit open or shorted to ground.
● MAP & IAT sensor malfunction.
● ECU malfunction.
 INSPECTION
 Step 1
1) Turn the ignition switch to the “OFF” position.
2) Check the MAP & IAT Sensor coupler for ①
loose or poor contacts.
If OK, then measure the MAP & IAT Sensor
input voltage.
3) Disconnect the
MAP & IAT Sensor
coupler .①
4) Turn the ignition switch to the “ON” position.
5) Measure the input voltage at the O/B wire and
ground.
If OK, then measure the input voltage at the O/B
wire and G/Bl wire.
MAP & IAT Sensor
input voltage
Tester knob indication:Voltage(—)
.
4.9 ~ 5.1 V
(
⊕
O/B-
⊖
Ground)
(
⊕
O/B-
⊖
G/Bl)