Nissan Frontier D22. Manual - part 549

 

  Index      Nissan     Nissan Frontier D22 Pickup (1998-2004 year) - Service and Repair Manual

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  547  548  549  550   ..

 

 

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.

 

 

 

 

 

 

 

Content   ..  547  548  549  550   ..