Nissan Frontier D22. Instruction — part 652
IGNITION SIGNAL
EC-1711
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Wiring Diagram
UBS00E2J
BBWA0496E
EC-1712
[VG33ER]
IGNITION SIGNAL
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 the ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
UBS00E2K
1.
INSPECTION START
Turn ignition switch OFF, and restart engine.
Is engine running?
Yes or No
Yes (With CONSULT-II)>>GO TO 2.
Yes (Without CONSULT-II)>>GO TO 3.
No
>> GO TO 4.
2.
CHECK OVERALL FUNCTION
With CONSULT-II
1.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.
2.
Make sure that all circuits do not produce a momentary engine
speed drop.
OK or NG
OK
>> INSPECTION END.
NG
>> GO TO 4.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
1
PU/W
Ignition signal
[Engine is running]
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
Approximately 0.7V
[Engine is running]
●
Engine speed is 2,000 rpm
1.1 - 1.5V
SEF988U
SEF989U
SEF070Y
IGNITION SIGNAL
EC-1713
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
3.
CHECK OVERALL FUNCTION
Without CONSULT-II
1.
Let engine idle.
2.
Read the voltage signal between ECM terminal 1 and ground
with an oscilloscope.
3.
Verify that the oscilloscope screen shows the signal wave as
shown below.
OK or NG
OK
>> INSPECTION END.
NG
>> GO TO 4.
4.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ignition coil harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between terminal 7 and ground with CONSULT-II
or tester.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E43, M65
●
Harness connectors M59, F27
●
Harness for open or short between ignition coil and ignition switch
>> Repair harness or connectors.
PBIB1431E
SEF988U
LEC811
Voltage: Battery voltage
SEF721U
EC-1714
[VG33ER]
IGNITION SIGNAL
6.
CHECK POWER TRANSISTOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect power transistor harness connector.
3.
Check harness continuity between power transistor terminal 2 and engine ground. Refer to Wiring Dia-
gram.
4.
Also check harness for short to power.
OK or NG
OK
>> GO TO 7.
NG
>> Repair open circuit or short to power in harness or connectors.
7.
CHECK INPUT SIGNAL CIRCUIT
1.
Strip tape covering resistor.
2.
Disconnect resistor harness connector.
3.
Check harness continuity between ignition coil terminal 8 and resistor terminal 1, resistor terminal 2 and
ECM terminal 2. Refer to Wiring Diagram.
4.
Also check for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK RESISTOR
Check resistance between resistor terminals 1 and 2.
OK or NG
OK
>> GO TO 9.
NG
>> Replace resistor.
9.
CHECK POWER TRANSISTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 1 and power transistor terminal 1. Refer to Wiring Dia-
gram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 10.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
Continuity should exist.
Continuity should exist.
Resistance: Approximately 2.2
Ω [at 25°C (77°F]
SEF240V
Continuity should exist.
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