Infiniti I35 (A33). Manual — part 277
Wiring Diagram
NHEC1266
MEC703D
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1065 ECM POWER SUPPLY (BACK UP)
Wiring Diagram
EC-449
Specification data are reference values and are measured between each terminal and body 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.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
67
W/L
Power supply for ECM
(Back-up)
[Ignition switch OFF]
BATTERY VOLTAGE
(11 - 14V)
Diagnostic Procedure
NHEC1267
1
CHECK ECM POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check voltage between ECM terminal 67 and ground with CONSULT-II or tester.
SEC912C
Voltage: Battery voltage
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E15, F18
I
Joint connector-13
I
15A fuse
I
Harness for open or short between ECM and fuse
©
Repair or replace harness or connectors.
3
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-152.
OK or NG
OK
©
GO TO 4.
NG
©
Repair or replace harness or connectors.
DTC P1065 ECM POWER SUPPLY (BACK UP)
Wiring Diagram (Cont’d)
EC-450
4
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-II
1. Turn ignition switch ON.
2. Select “SELF DIAG RESULTS” mode with CONSULT-II.
3. Touch “ERASE”.
4. Perform DTC Confirmation Procedure.
See EC-448.
5. Is the 1st trip DTC P1065 displayed again?
With GST
1. Turn ignition switch ON.
2. Select MODE 4 with GST.
3. Touch “ERASE”.
4. Perform DTC Confirmation Procedure.
See EC-448.
5. Is the 1st trip DTC P1065 displayed again?
Yes or No
Yes
©
GO TO 5.
No
©
INSPECTION END
5
REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to “IVIS (INFINITI
VEHICLE IMMOBILIZER SYSTEM — NATS)”, EC-90.
3. Perform “Accelerator Pedal Released Position Learning”, EC-70.
4. Perform “Throttle Valve Closed Position Learning”, EC-70.
5. Perform “Idle Air Volume Learning”, EC-70.
©
INSPECTION END
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1065 ECM POWER SUPPLY (BACK UP)
Diagnostic Procedure (Cont’d)
EC-451
SEC266C
Component Description
NHEC0803
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 film that is supplied with electric
current from the ECM. The temperature of the hot film is controlled
by the ECM a certain amount. The heat generated by the hot film
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 film as air flow increases. The ECM
detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0804
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
1.1 - 1.5V
2,500 rpm
1.7 - 2.4V
CAL/LD VALUE
ditto
Idle
10 - 35%
2,500 rpm
10 - 35%
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
NHEC1446
This self-diagnosis has the one trip detection logic.
NOTE:
If DTC P1102 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229. Refer to
EC-539.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P1102
1102
Mass air flow sensor
circuit range/
performance problem
A voltage from the sensor is constantly approx.
1.0V when engine is running.
I
Harness or connectors
(The sensor circuit is open or
shorted.)
I
Mass air flow sensor
FAIL-SAFE MODE
NHEC1446S01
When the malfunction 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 Confirmation Procedure
NHEC1447
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 P1102 MAF SENSOR
Component Description
EC-452
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