Infiniti G20 (P11). Manual — part 185
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8
CHECK ECM POWER SUPPLY CIRCUIT-III
1. Stop engine.
2. Check voltage between ECM terminal 67 and ground with CONSULT-II or tester.
SEF293X
OK or NG
OK
©
GO TO 10.
NG
©
GO TO 9.
9
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M62, F24
I
Fuse block (J/B) connector M4, M5
I
7.5A fuse
I
Harness for open or short between ECM and 7.5A fuse
©
Repair harness or connectors.
10
CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Turn ignition switch “ON” and then “OFF”.
2. Check voltage between ECM terminals 110, 112 and ground with CONSULT-II or tester.
SEF294X
OK or NG
OK
©
GO TO 16.
NG (Battery voltage
does not exist.)
©
GO TO 11.
NG (Battery voltage
exists for more than a
few seconds.)
©
GO TO 13.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit (Cont’d)
EC-151
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11
CHECK ECM POWER SUPPLY CIRCUIT-V
1. Disconnect ECM relay.
SEF185XA
2. Check voltage between ECM relay terminal 5 and ground with CONSULT-II or tester.
SEF916Z
OK or NG
OK
©
GO TO 13.
NG
©
GO TO 12.
12
DETECT MALFUNCTIONING PART
Check harness for open or short between ECM relay and 7.5A fuse.
©
Repair open circuit or short to ground or short to power in harness or connectors.
13
CHECK HARNESS CONTINUITY BETWEEN ECM RELAY AND ECM FOR OPEN AND SHORT
1. Check harness continuity between ECM terminals 110, 112 and ECM relay terminal 3.
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 15.
NG
©
GO TO 14.
14
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M62, F24
I
Harness for open or short between ECM and ECM relay
©
Repair open circuit or short to ground or short to power in harness or connectors.
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit (Cont’d)
EC-152
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15
CHECK ECM RELAY
1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between ECM relay terminals 3 and 5, 6 and 7.
SEC202BC
12V (1 - 2) applied: Continuity exists.
No voltage applied: No continuity
OK or NG
OK
©
GO TO 16.
NG
©
Replace ECM relay.
16
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 ground and short to power.
OK or NG
OK
©
GO TO 17.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
17
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-146.
©
INSPECTION END
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit (Cont’d)
EC-153
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SEF987W
Component Description
NCEC0050
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
NCEC0051
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
1.3 - 1.7V
2,500 rpm
1.8 - 2.4V
CAL/LD VALUE
I
Engine: After warming up
I
Air conditioner switch: “OFF”
I
Shift lever: “N”
I
No-load
Idle
20.0 - 35.5%
2,500 rpm
17.0 - 30.0%
MASS AIRFLOW
I
Engine: After warming up
I
Air conditioner switch: “OFF”
I
Shift lever: “N”
I
No-load
Idle
2.5 - 5.0 g·m/s
2,500 rpm
7.1 - 12.5 g·m/s
ECM Terminals and Reference Value
NCEC0052
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
61
L
Mass air flow sensor
[Engine is running]
I
Warm-up condition
I
Idle speed
1.3 - 1.7V
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,500 rpm
1.8 - 2.4V
73
G
Mass air flow sensor
ground
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0V
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
Component Description
EC-154
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