Infiniti QX4 (R50). Manual — part 445
SGI854
CONTROL UNIT CIRCUIT TEST
NBGI0004S0307
System Description: When the switch is ON, the control unit lights
up the lamp.
MGI034A
Input-output voltage chart
Pin No.
Item
Condition
Voltage
value [V]
In case of high resistance such as single strand [V]
*
1
Switch
Switch ON
Battery voltage
Lower than battery voltage Approx. 8 (Example)
Switch OFF
Approx. 0
Approx. 0
2
Lamp
Switch ON
Battery voltage
Approx. 0 (Inoperative lamp)
Switch OFF
Approx. 0
Approx. 0
The voltage value is based on the body ground.
* : If high resistance exists in the switch side circuit (caused by a single strand), terminal 1 does not detect battery voltage. Control unit
does not detect the switch is ON even if the switch does not turn ON. Therefore, the control unit does not supply power to light up the
lamp.
HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT
Circuit Inspection (Cont’d)
GI-32
MGI035A
Input-output voltage chart
Pin No.
Item
Condition
Voltage
value [V]
In case of high resistance such as single strand [V]
*
1
Lamp
Switch ON
Approx. 0
Battery voltage (Inoperative lamp)
Switch OFF
Battery voltage
Battery voltage
2
Switch
Switch ON
Approx. 0
Higher than 0 Approx. 4 (Example)
Switch OFF
Approx. 5
Approx. 5
The voltage value is based on the body ground.
* : If high resistance exists in the switch side circuit (caused by a single strand), terminal 2 does not detect approx. 0V. Control unit
does not detect the switch is ON even if the switch does not turn ON. Therefore, the control unit does not control ground to light up the
lamp.
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT
Circuit Inspection (Cont’d)
GI-33
NBGI0005
NOTICE:
Trouble diagnoses indicates work procedures required to diagnose
problems effectively. Observe the following instructions before
diagnosing.
1)
Before performing trouble diagnoses, read the “Prelimi-
nary Check”, the “Symptom Chart” or the “Work Flow”.
2)
After repairs, re-check that the problem has been com-
pletely eliminated.
3)
Refer to Component Parts and Harness Connector Loca-
tion for the Systems described in each section for
identification/location of components and harness con-
nectors.
4)
Refer to the Circuit Diagram for quick pinpoint check.
If you need to check circuit continuity between harness
connectors in more detail, such as when a sub-harness is
used, refer to Wiring Diagram in each individual section
and Harness Layout in EL section for identification of har-
ness connectors.
5)
When checking circuit continuity, ignition switch should
be OFF.
6)
Before checking voltage at connectors, check battery volt-
age.
7)
After accomplishing the Diagnostic Procedures and Elec-
trical Components Inspection, make sure that all harness
connectors are reconnected as they were.
HOW TO FOLLOW TROUBLE DIAGNOSIS
GI-34
How to Follow Test Groups in Trouble
Diagnosis
NBGI0005S01
SGI138A
1)
Work and diagnostic procedure
Start to diagnose a problem using procedures indicated in
enclosed test groups.
2)
Questions and required results.
Questions and required results are indicated in bold type in test
group.
The meaning of are as follows:
a. Battery voltage
→
11 - 14V or approximately 12V
b. Voltage: Approximately 0V
→
Less than 1V
3)
Symbol used in illustration
Symbols included in illustrations refer to measurements or pro-
cedures. Before diagnosing a problem, familiarize yourself with
each symbol. Refer to “CONNECTOR SYMBOLS” (GI-15) and
“Key to Symbols Signifying Measurements or Procedures” (GI-
36).
4)
Action items
Next action for each test group is indicated based on result of
each question. Test group number is shown in the left upper
portion of each test group.
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
HOW TO FOLLOW TROUBLE DIAGNOSIS
How to Follow Test Groups in Trouble Diagnosis
GI-35
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст