Nissan Frontier D22. Manual - part 254

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-119

[KA24DE]

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E

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G

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A

EC

EC-120

[KA24DE]

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT

PFP:00006

Description

UBS00D1T

Intermittent incidents (I/I) may occur. In many cases, the malfunction resolves itself (the part or circuit function
returns to normal without intervention). It is important to realize that the symptoms described in the customer's
complaint often do not recur on DTC (1st trip) visits. Realize also that the most frequent cause of I/I occur-
rences 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 indicate the
specific malfunctioning area.
Common I/ Report Situations

Diagnostic Procedure

UBS00D1U

1. 

INSPECTION START

Erase (1st trip) DTCs. Refer to 

EC-61, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMA-

TION"

 .

>> GO TO 2.

2. 

CHECK GROUND TERMINALS

Check ground terminals for corroding or loose connection. Refer to “CIRCUIT INSPECTION”, “Ground Inspec-
tion” in 

GI-25, "How to Perform Efficient Diagnosis for an Electrical Incident"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace.

3. 

SEARCH FOR ELECTRICAL INCIDENT

Perform “INCIDENT SIMULATION TESTS” in 

GI-25, "How to Perform Efficient Diagnosis for an Electrical Inci-

dent"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace.

4. 

CHECK CONNECTOR TERMINALS

Refer to “How to Check Enlarged Contact Spring of Terminal”, “HOW TO PROBE CONNECTORS” in 

GI-22,

"How to Check Terminal"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace connector.

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 malfunctioning area.

POWER SUPPLY CIRCUIT FOR ECM

EC-121

[KA24DE]

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EC

POWER SUPPLY CIRCUIT FOR ECM

PFP:24110

Wiring Diagram

UBS00D1V

BBWA1054E

EC-122

[KA24DE]

POWER SUPPLY CIRCUIT FOR ECM

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.

Diagnostic Procedure

UBS00D1W

1. 

INSPECTION START

Start engine.
Is engine running?

Yes or No

Yes

>> GO TO 4.

No

>> GO TO 2.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

4

LG/R

ECM relay 
(Self shut-off) 

[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)

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/G

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