Nissan Frontier D22. Manual — part 549
POWER SUPPLY CIRCUIT FOR ECM
EC-1299
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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.
Diagnostic Procedure
UBS00DSN
1.
INSPECTION START
Start engine.
Is engine running?
Yes or No
Yes
>> GO TO 6.
No
>> GO TO 2.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
4
OR/B
ECM relay
(Self-shutoff)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition switch OFF
0 - 1.5V
[Ignition switch: OFF]
●
A few seconds passed after turning ignition switch
OFF
BATTERY VOLTAGE
(11 - 14V)
10
B/R
ECM ground
[Engine is running]
●
Idle speed
Engine ground
19
B/R
ECM ground
[Engine is running]
●
Idle speed
Engine ground
24
W/L
Ignition switch
[Ignition switch: OFF]
0V
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
25
B/Y
ECM ground
[Engine is running]
●
Idle speed
Engine ground
32
B/Y
ECM ground
[Engine is running]
●
Idle speed
Engine ground
67
B/P
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
72
B/P
80
SB
Power supply
(Back-up)
[Ignition switch: OFF]
BATTERY VOLTAGE
(11 - 14V)
116
B/R
ECM ground
[Engine is running]
●
Idle speed
Engine ground
117
B/P
Current return
[Engine is running]
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
124
B/R
ECM ground
[Engine is running]
●
Idle speed
Engine ground
EC-1300
[VG33ER]
POWER SUPPLY CIRCUIT FOR ECM
2.
CHECK ECM POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch OFF and then ON.
2.
Check voltage between ECM terminal 24 and ground with CON-
SULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E43, M65
●
Harness connectors M59, F27
●
Fuse block (J/B) connector E49
●
10A fuse
●
Harness for open or short between ECM and fuse
>> Repair harness or connectors.
4.
CHECK ECM GROUND CIRCUIT-I FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminals 10, 19, 25, 32, 116, 124 and engine ground.
Refer to Wiring Diagram.
4.
Also check harness for short to power.
OK or NG
OK
>> GO TO 15.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness for open between ECM and engine ground
>> Repair open circuit or short to power in harness or connectors.
Voltage: Battery voltage
SEF674U
Continuity should exist.
POWER SUPPLY CIRCUIT FOR ECM
EC-1301
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
6.
CHECK ECM POWER SUPPLY CIRCUIT-II
1.
Stop engine.
2.
Check voltage between ECM terminal 80 and ground with CON-
SULT-II or tester.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M81, F36
●
Fuse block (J/B) connector M27
●
10A fuse
●
Harness for open or short between ECM and fuse
>> Repair harness or connectors.
8.
CHECK ECM POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch ON and then OFF.
2.
Check voltage between ECM terminals 67, 72, 117 and ground
with CONSULT-II or tester.
OK or NG
OK
>> GO TO 14.
NG (Battery voltage does not exist.)>>GO TO 9.
NG (Battery voltage exists for more than a few seconds.)>>GO TO
13.
Voltage: Battery voltage
SEF678U
Voltage
: After turning ignition switch OFF, battery
voltage will exist for a few seconds, then
drop to approximately 0V.
SEF679U
EC-1302
[VG33ER]
POWER SUPPLY CIRCUIT FOR ECM
9.
CHECK ECM POWER SUPPLY CIRCUIT-IV
1.
Disconnect ECM relay.
2.
Check voltage between terminals 2, 5 and ground with CON-
SULT-II or tester.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness for open or short between ECM relay and harness connectors M59, F27
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK ECM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 4 and ECM relay terminal 1.
Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 12.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
12.
CHECK HARNESS CONTINUITY BETWEEN ECM RELAY AND ECM FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminals 67, 72, 117 and ECM relay terminal 3.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 13.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
LEC106A
Voltage: Battery voltage
SEF625W
Continuity should exist.
Continuity should exist.
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