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ENGINE (J05E)/TROUBLESHOOTING
2–714
1.
Connect the signal check harness to engine ECU.
2.
Set the starter key to the "ON" position.
3.
Use the electrical tester to measure the voltage between the termi-
nals of the air flow sensor vehicle side connector.
NO
YES
1.
Set the starter key to the "LOCK" position.
2.
Connect the air flow sensor connector.
3.
Start the engine.
4.
Use an oscilloscope to measure the signal voltage between the
terminals of the engine ECU (signal check harness).
NO
YES
6
Inspect the air flow sensor power supply
B+
E2G
SHTS021270300651
Measurement
conditions
Tester
connections
Standard values
Starter key: ON
Air flow sensor
vehicle side con-
nector terminals
+B
–
E2G
11.5
–
13.5 V
Do the measurements meet the standard value?
Go to step 7.
Replace the engine ECU.
7
Inspect the air flow sensor signal unit
E74
E78
D
SHTS021270300652
Measurement
conditions
Tester
connections
Standard values
After warm up, the
engine idling con-
dition
Engine ECU
(the signal check
harness)
VG (E74)
–
EVG (E78)
5
–
6 kHz
Do the measurements meet the standard value?
Go to step 8.
Replace the air flow sensor.
Perform "After-inspection work" of INFOR-
MATION section.