Infiniti Q45 (FY33). Manual — part 147
Description
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 DTC (1st trip) 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
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 data does not appear during the DTC CONFIRMATION PROCEDURE.
VI
The TROUBLE DIAGNOSIS for PXXXX does not indicate the problem area.
Diagnostic Procedure
Erase (1st trip) DTCs. Refer to “HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION” (EC-63).
Check ground terminals. Refer to “Circuit Inspection”, “GROUND INSPECTION” (GI section).
Perform “Incident Simulation Tests” (GI section).
Check connector terminals. Refer to “How to Check Enlarged Contact Spring of Terminal” (GI section).
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT
H
H
H
EC-117
Main Power Supply and Ground Circuit
TEC040M
TROUBLE DIAGNOSIS FOR POWER SUPPLY
EC-118
TEC014M
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit
(Cont’d)
EC-119
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
56
W/L
Power supply (Back-up)
Ignition switch “OFF”
BATTERY VOLTAGE
(11 - 14V)
121
B
ECM ground
Engine is running.
Idle speed
Engine ground
122
B
ECM ground
Engine is running.
Idle speed
Engine ground
123
W
Current return
Engine is running.
Idle speed
BATTERY VOLTAGE
(11 - 14V)
124
W/B
ECM relay (Self-shutoff)
Engine is running.
Ignition switch “OFF”
For a few seconds after turning ignition switch
“OFF”
0 - 1V
Ignition switch “OFF”
A few seconds passed after turning ignition
switch “OFF”
BATTERY VOLTAGE
(11 - 14V)
125
B
ECM ground
Engine is running.
Idle speed
Engine ground
127
B
ECM ground
Engine is running.
Idle speed
Engine ground
128
B
ECM ground
Engine is running.
Idle speed
Engine ground
130
131
R/G
Power supply for ECM
Ignition switch “ON”
BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit
(Cont’d)
EC-120
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