Infiniti QX4 (R50). Manual — part 168
SEF615Z
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — SPECIFICATION VALUE
Diagnostic Procedure (Cont’d)
EC-139
Description
NBEC0045
Intermittent incidents (I/I) may occur. In many cases, the problem resolves itself (the part or circuit function
returns to normal without intervention). It is important to realize that the symptoms described in the custom-
er’s complaint often do not recur on (1st trip) DTC visits. Realize also that the most frequent cause of I/I
occurrences is poor electrical connections. Because of this, the conditions under which the incident occurred
may not be clear. Therefore, circuit checks made as part of the standard diagnostic procedure may not indi-
cate the specific problem area.
COMMON I/I REPORT SITUATIONS
NBEC0045S01
STEP in Work Flow
Situation
II
The CONSULT-II is used. The SELF-DIAG RESULTS screen shows time data other than “0” or “[1t]”.
III
The symptom described by the customer does not recur.
IV
(1st trip) DTC does not appear during the DTC Confirmation Procedure.
VI
The Diagnostic Procedure for PXXXX does not indicate the problem area.
Diagnostic Procedure
NBEC0046
1
INSPECTION START
Erase (1st trip) DTCs. Refer to “HOW TO ERASE EMISSION — RELATED INFORMATION”, EC-72.
©
GO TO 2.
2
CHECK GROUND TERMINALS
Check ground terminals for corroding or loose connection.
Refer to GI-30, “GROUND INSPECTION”.
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace.
3
SEARCH FOR ELECTRICAL INCIDENT
Perform GI-36, “Incident Simulation Tests”.
OK or NG
OK
©
GO TO 4.
NG
©
Repair or replace.
4
CHECK CONNECTOR TERMINALS
Refer to GI-27, “How to Check Enlarged Contact Spring of Terminal”.
OK or NG
OK
©
INSPECTION END
NG
©
Repair or replace connector.
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT
Description
EC-140
ECM Terminals and Reference Value
NBEC0648
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)
26
L/B
ECM relay
(Self shutt-off)
[Engine is running]
[Ignition switch “OFF”]
I
For a few seconds after turning ignition switch
“OFF”
0 - 1.5V
[Ignition switch “OFF”]
I
A few seconds passed after turning ignition
switch “OFF”
BATTERY VOLTAGE
(11 - 14V)
43
R
Ignition switch
[Ignition switch “OFF”]
0V
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
48
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
[Probe this terminal with (–)
tester probe when measuring]
57
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
12
67
W/R
Power supply for ECM
(Buck-up)
[Ignition switch “OFF”]
BATTERY VOLTAGE
(11 - 14V)
108
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
110
112
B/W
B/W
Power supply for ECM
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS FOR POWER SUPPLY
ECM Terminals and Reference Value
EC-141
Main Power Supply and Ground Circuit
WIRING DIAGRAM
NBEC0047
MEC940C
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit
EC-142
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