Infiniti QX4 (R50). Manual — part 258
Component Description
NBEC0286
IGNITION COIL & POWER TRANSISTOR
NBEC0286S01
The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
on and off the ignition coil primary circuit. This on-off operation induces the proper high voltage in the coil
secondary circuit.
SEF975Y
ECM Terminals and Reference Value
NBEC0675
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)
21
22
23
30
31
32
Y/R
G/R
L/R
GY
PU/W
GY/R
Ignition signal No. 1
Ignition signal No. 2
Ignition signal No. 3
Ignition signal No. 4
Ignition signal No. 5
Ignition signal No. 6
[Engine is running]
I
Warm-up condition
I
Idle speed
0 - 0.2V
★
SEF399T
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,500 rpm.
0.1 - 0.3V
★
SEF645T
★
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
On Board Diagnosis Logic
NBEC0288
Malfunction is detected when the ignition signal in the primary cir-
cuit is not sent to ECM during engine cranking or running.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1320 IGNITION SIGNAL
Component Description
EC-499
Possible Cause
NBEC0572
I
Harness or connectors (The ignition primary circuit is open or
shorted.)
I
Power transistor unit built into ignition coil
I
Condenser
I
Crankshaft position sensor (REF)
I
Crankshaft position sensor (REF) circuit
SEF058Y
DTC Confirmation Procedure
NBEC0289
NOTE:
I
If
“DTC
Confirmation
Procedure”
has
been
previously
conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.
I
If DTC P1320 is displayed with DTC P0335, P0340, P1335
or P1336, perform trouble diagnosis for DTC P0335,
P0340, P1335 or P1336 first. Refer to EC-334, EC-342,
EC-510 or EC-517.
WITH CONSULT-II
NBEC0289S01
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine. (If engine does not run, turn ignition switch to
“START” for at least 5 seconds.)
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-504.
WITH GST
NBEC0289S02
Follow the procedure “WITH CONSULT-II” above.
DTC P1320 IGNITION SIGNAL
Possible Cause
EC-500
Wiring Diagram
NBEC0290
MEC969C
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1320 IGNITION SIGNAL
Wiring Diagram
EC-501
MEC970C
DTC P1320 IGNITION SIGNAL
Wiring Diagram (Cont’d)
EC-502
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