Infiniti I30 (A33). Manual — part 211
7
CHECK MAFS INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between MAFS terminal 1 and ECM terminal 61.
Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 8.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
8
CHECK MASS AIR FLOW SENSOR
1. Reconnect harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 61 (Mass air flow sensor signal) and ground.
SEF298X
4. If the voltage is out of specification, disconnect MAFS harness connector and connect it again.
Then repeat above check.
OK or NG
OK
©
GO TO 9.
NG
©
Replace mass air flow sensor.
9
CHECK MAFS SHIELD CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect joint connector-18.
3. Check the following.
I
Continuity between joint connector terminal 1 and ground
Refer to Wiring Diagram.
I
Joint connector-18
(Refer to EL-525, “HARNESS LAYOUT”.)
Continuity should exist.
4. Also check harness for short to power.
5. Then reconnect joint connector-18.
OK or NG
OK
©
GO TO 10.
NG
©
Repair open circuit or short to power in harness or connectors.
10
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-144.
©
INSPECTION END
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DTC P0100 MASS AIR FLOW SENSOR (MAFS)
Diagnostic Procedure (Cont’d)
EC-159
SEF052V
SEF946S
Component Description
NHEC0058
The absolute pressure sensor detects ambient barometric pressure
and sends the voltage signal to the ECM. As the pressure
increases, the voltage rises.
On Board Diagnosis Logic
NHEC0059
Malfunction is detected when an excessively low or high voltage
from the sensor is sent to ECM.
Possible Cause
NHEC0427
I
Harness or connectors
(Absolute pressure sensor circuit is open or shorted.)
I
Absolute pressure sensor
DTC Confirmation Procedure
NHEC0060
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
DTC P0105 ABSOLUTE PRESSURE SENSOR
Component Description
EC-160
SEF058Y
WITH CONSULT-II
NHEC0060S01
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Wait at least 10 seconds.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-163.
WITH GST
NHEC0060S02
Follow the procedure “WITH CONSULT-II” above.
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DTC P0105 ABSOLUTE PRESSURE SENSOR
DTC Confirmation Procedure (Cont’d)
EC-161
Wiring Diagram
=NHEC0062
MEC135D
SEF651XB
DTC P0105 ABSOLUTE PRESSURE SENSOR
Wiring Diagram
EC-162
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