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:
FM radio reception
Range: FM range is normally limited to 25 – 30 mi
(40 – 48 km), with monaural (single channel) FM
having slightly more range than stereo FM. External
influences may sometimes interfere with FM
station reception even if the FM station is within
25 mi (40 km). The strength of the FM signal is ...
Brake warning lamp
Component Function Check
1.CHECK BRAKE WARNING LAMP FUNCTION (1)
Check that brake warning lamp in combination meter turns ON for
approximately 2 seconds after ignition
switch is turned ON.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Proceed to diagnosis procedure. ...
Evaporative emission system
Inspection
EVAP CANISTER
1.CHECK EVAP CANISTER
Block port (B).
Blow air into port (A) and check that it flows freely out of port (C).
Release blocked port (B).
Apply vacuum pressure to port (B) and check that vacuum pressure
exists at the ports (A) and (C).
Block port (A) and (B).
...
