MPI <6A1> -
Troubleshooting
13A-101
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No. P0100 Air flow sensor system Probable cause
Range of Check
D
Engine speed: 500 r/min or more
Set Conditions
D
The sensor output frequency is 3.3 Hz or less for four seconds.
D
Malfunction of air flow sensor
D
Open or short circuit in air flow sensor circuit or
loose connector contact
D
Malfunction of engine-ECU
OK
To the next page
OK
Replace the air flow sensor.
OK
Check the harness between the air
flow sensor and the engine-ECU.
NG
Repair
NG
Check the following connector:
C-168
NG
Repair
OK
Measure at air flow sensor connector
B-12.
D
Use test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.
D
Ignition switch: ON
D
Voltage between terminal 7 and
earth
OK:
7-8V
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness between the air
flow sensor and the engine-ECU.
NG
Repair
(3) NG
Check the following connector:
C-167
NG
Repair
OK
Check the harness between the air
flow sensor and the engine control
relay, and repair if necessary.
(2) NG
Check the following connector:
C-31
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness between the air
flow sensor and the engine-ECU.
NG
Repair
NG
Check the following connector:
C-167
NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
NG
Repair
OK
Check the following connector:
C-167
(1) NG
Measure at engine-ECU connector
C-167.
D
Measure the voltage at the
engine-ECU terminal.
D
Ignition switch: ON
D
Voltage between terminal 61 and
earth
OK:
4.8 - 5.2 V
OK
Measure at air flow sensor connector
B-12.
D
Disconnect the connector and
measure at the harness side.
(1) Voltage between terminal 3 and
earth (Ignition switch: ON)
OK:
4.8 - 5.2 V
(2) Voltage between terminal 4 and
earth (Ignition switch: ON)
OK:
System voltage
(3) Resistance between terminal 5
and earth
OK:
2
W
or less
NG
Check the following connector:
B-12
NG
Repair
MUT-
II
Data list
12 Air flow sensor (Refer to
P.13A-176, DATA LIST
REFERENCE TABLE.)
OK
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
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