Infiniti I30 (A33). Manual — part 209
16
CHECK ECM RELAY
1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 5, 6 and 7.
SEF296X
OK or NG
OK
©
GO TO 17.
NG
©
Replace ECM relay.
17
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 48, 57, 106, 108 and engine ground.
Refer to WIRING DIAGRAM.
Continuity should exist.
4. Also check harness for short to power.
OK or NG
OK
©
GO TO 18.
NG
©
Repair open circuit or short to power in harness or connectors.
18
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-144.
©
INSPECTION END
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TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit (Cont’d)
EC-151
SEF987W
Component Description
NHEC0050
The mass air flow sensor is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. It consists of a hot wire that is supplied with electric
current from the ECM. The temperature of the hot wire is controlled
by the ECM a certain amount. The heat generated by the hot wire
is reduced as the intake air flows around it. The more air, the
greater the heat loss.
Therefore, the ECM must supply more electric current to maintain
the temperature of the hot wire as air flow increases. The ECM
detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0051
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
MAS A/F SE-B1
I
Engine: After warming up
I
Air conditioner switch: “OFF”
I
Shift lever: “N”
I
No-load
Idle
1.2 - 1.8V
2,500 rpm
1.6 - 2.2V
CAL/LD VALUE
ditto
Idle
14.0 - 33.0%
2,500 rpm
12.0 - 25.0%
MASS AIRFLOW
ditto
Idle
2.0 - 6.0 g·m/s
2,500 rpm
7.0 - 20.0 g·m/s
On Board Diagnosis Logic
NHEC0053
Malfunction is detected when
(Malfunction A) an excessively high voltage from the sensor is
sent to ECM when engine is not running,
(Malfunction B) an excessively low voltage from the sensor is sent
to ECM when engine is running,
(Malfunction C) a high voltage from the sensor is sent to ECM
under light load driving condition,
(Malfunction D) a low voltage from the sensor is sent to ECM
under heavy load driving condition,
(Malfunction E) a voltage from the sensor is constantly approx.
1.0V when engine is running.
FAIL-SAFE MODE
NHEC0053S02
When the malfunction B is detected, the ECM enters fail-safe mode
and the MIL lights up.
Detected items
Engine operating condition in fail-safe mode
Mass air flow sensor circuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
Component Description
EC-152
Possible Cause
NHEC0426
MALFUNCTION A OR C
NHEC0426S01
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Mass air flow sensor
MALFUNCTION B, D OR E
NHEC0426S02
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Intake air leaks
I
Mass air flow sensor
DTC Confirmation Procedure
NHEC0054
Perform “PROCEDURE FOR MALFUNCTION A” first.
If the 1st trip DTC cannot be confirmed, perform “PROCE-
DURE FOR MALFUNCTION B AND E”.
If there is no problem on “PROCEDURE FOR MALFUNCTION
B AND E”, perform “PROCEDURE FOR MALFUNCTION C”.
If there is no problem on ”PROCEDURE FOR MALFUNCTION
C”, perform “PROCEDURE FOR MALFUNCTION D”.
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.
SEF058Y
PROCEDURE FOR MALFUNCTION A
NHEC0054S01
With CONSULT-II
NHEC0054S0101
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Wait at least 6 seconds.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-157.
With GST
NHEC0054S0102
Follow the procedure “With CONSULT-II” above.
SEF058Y
PROCEDURE FOR MALFUNCTION B AND E
NHEC0054S02
With CONSULT-II
NHEC0054S0201
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and wait 5 seconds at most.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-157.
With GST
NHEC0054S0202
Follow the procedure “With CONSULT-II” above.
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DTC P0100 MASS AIR FLOW SENSOR (MAFS)
Possible Cause
EC-153
NOTE:
If 1st trip DTC is confirmed after more than 5 seconds, there may
be malfunction C.
SEF174Y
PROCEDURE FOR MALFUNCTION C
NHEC0054S03
NOTE:
If engine will not start or stops soon, wait at least 10 seconds with
engine stopped (Ignition switch “ON”) instead of running engine at
idle speed.
With CONSULT-II
NHEC0054S0301
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and warm it up to normal operating temperature.
4)
Run engine for at least 10 seconds at idle speed.
5)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-157.
With GST
NHEC0054S0302
Follow the procedure “With CONSULT-II” above.
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
DTC Confirmation Procedure (Cont’d)
EC-154
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