Nissan Sentra Service Manual: B142A Ignition voltage
Description
DTC B142A IGNITION VOLTAGE
Ignition voltage is supplied to the air bag diagnosis sensor unit when the ignition is in the ON position. The air bag diagnosis sensor unit will monitor for low or high ignition voltage.
PART LOCATION
Refer to SRC-5, "Component Parts Location".
DTC Logic
DTC DETECTION LOGIC
With CONSULT
DTC CONFIRMATION PROCEDURE (With CONSULT)
1.CHECK SELF-DIAG RESULT
- Turn ignition switch ON.
- Check for DTC using CONSULT.
Is the DTC detected? YES (Current DTC)>>Refer to SRC-96, "Diagnosis Procedure".
YES (Past DTC)>>GO TO 2.
NO >> Inspection End.
2.ERASE SELF-DIAG RESULT
Erase the DTC using CONSULT.
Can the DTC be erased? YES >> Inspection End.
NO >> Refer to SRC-96, "Diagnosis Procedure".
DTC CONFIRMATION PROCEDURE (Without CONSULT)
1.CHECK SELF-DIAG RESULT
- Turn ignition switch ON.
- Check the air bag warning lamp status. Refer to SRC-17, "Trouble Diagnosis without CONSULT".
NOTE:
SRS will not enter diagnosis mode if no malfunction is detected in user mode.
Is the DTC detected? YES >> Refer to SRC-96, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis Procedure
1.HARNESS CONNECTOR
Visually inspect all applicable harness connectors for the following:
- Visible damage to connector or terminal
- Loose terminal
- Poor connection
NOTE:
All harness connectors should be inspected from the air bag diagnosis unit to the end component (including any in-line connectors).
Is the inspection result normal? YES >> GO TO 2.
NO >> Perform one of the following repairs:
- Visible damage: Replace the harness.
- Loose terminal: Secure the terminal.
- Poor connection: Secure the connection.
2.CONFIRM DTC
- Reconnect all harness connectors.
- Turn ignition switch ON.
- Check for DTC using CONSULT.
Is DTC still current? YES >> GO TO 3 NO >> Refer to GI-39, "Intermittent Incident".
3.WIRING HARNESS
Check the wiring harness for visible damage.
NOTE:
The entire wiring harness should be inspected from the air bag diagnosis sensor unit to the end component (including any in-line connectors).
Is the inspection result normal? YES >> GO TO 4.
NO >> Replace the harness.
4.CONFIRM DTC
- Reconnect all harness connectors.
- Turn ignition switch ON.
- Check for DTC using CONSULT.
Is DTC still current? YES >> GO TO 5.
NO >> Refer to GI-39, "Intermittent Incident".
5.AIR BAG DIAGNOSIS SENSOR UNIT
- Replace the air bag diagnosis sensor unit. Refer to SR-28, "Removal and Installation".
- Turn ignition switch ON.
- Check for DTC using CONSULT.
Is DTC still current? YES >> GO TO 6.
NO >> Clear DTC. Inspection End.
6.RELATED HARNESS
Replace the related harness.
>> END
B1431, B1433 Seat belt pre-tensioner RH
Description
DTC B1431, B1433 SEAT BELT PRE-TENSIONER RH
The seat belt pre-tensioner RH is wired to the air bag diagnosis sensor unit.
The air bag diagnosis sensor unit
will monitor for opens and ...
B142X Collision detection
Description
DTC B142X COLLISION DETECTION
The air bag diagnosis sensor unit will set this DTC if it has detected a
collision which has resulted in a deployment
of one or more air bags or pre-tens ...
Other materials:
Periodic maintenance
FUEL SYSTEM
Inspection
Inspect fuel lines, fuel filler cap, and fuel tank for improper attachment,
leakage, cracks, damage, loose connections, chafing or deterioration.
Engine
Fuel line
Fuel tank
If necessary, repair or replace damaged parts.
Quick Connector
CAUTION:
After c ...
Charging system preliminary inspection
Diagnosis Procedure
1.CHECK BATTERY TERMINALS CONNECTION
Check if battery terminals are clean and tight.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair battery terminal connection. Confirm repair by performing complete
Charging system test
using EXP-800 NI or G ...
Push-Button Ignition Switch (if so equipped)
WARNINGDo not operate the push-button ignition
switch while driving the vehicle except in
an emergency. (The engine will stop when
the ignition switch is pushed 3 consecutive
times in quick succession or the ignition
switch is pushed and held for more
than 2 seconds.) If ...
