Mash Seventy - Page 117

Chapter 4 EI system diagnosis Section 4 EI system troubleshooting
4—22
Is the input voltage OK?
YES
Go to Step 2.
NO
● LooseorpoorcontactsontheECU
coupler.
● OpenorshortcircuitintheO/Bwire
or G/Bl wire.
 Step 2
1) Connect the MAP & IAT Sensor coupler .①
2) Inserttheneedlepointedprobestotheleadwire
coupler.
3) Turn the ignition switch to the “ON”position.
4) Measurethe MAP & IAT
Sensoroutputvoltageat thewire
sidecoupler(betweenBl/G
andG/Blwires).
Tester knob indication:Voltage(—)
Is the output voltage OK?
Approx. 1.5V at idle
speed
(
⊕
Bl/G-
⊖
G/Bl)
MP & IAT
Sensor out put
voltage
YES
● O/B, Bl/G or G/Bl wire openor
shorted to ground, or poor B16
（J2-16） ,
B11(J2-11) or
B10(J2-10)connection of ECU
coupler.
● If wire and connection are OK,
intermittent trouble or faulty
ECU.
● Recheck each terminal and wire
harness for open circuit and
poor connection.
NO
If check result is not satisfactory,
replace the MAP & IAT Sensor
with a new one.
B16 B11 B10
B16
B11
B10