Nissan Sentra Service Manual: Control Units and Electrical Parts
PRECAUTIONS
- Never reverse polarity of battery terminals.
- Install only parts specified for a vehicle.
- Before replacing the control unit, check the input and output and
functions of the component parts.
- Do not apply excessive force when disconnecting a connector.

- Do not apply excessive shock to the control unit by dropping or hitting
it.
- Be careful to prevent condensation in the control unit due to rapid
temperature changes and do not let water or rain get on it. If water
is found in the control unit, dry it fully and then install it in the
vehicle.
- Be careful not to let oil to get on the control unit connector.
- Avoid cleaning the control unit with volatile oil.
- Do not disassemble the control unit, and do not remove the upper
and lower covers.

- When using a DMM, be careful not to let test probes get close to
each other to prevent the power transistor in the control unit from
damaging battery voltage because of short circuiting.
- When checking input and output signals of the control unit, use the
specified check adapter.
STEP
DESCRIPTION
STEP 1
Get detailed information about the conditions and the
environment when the incident occurred.
The following are key pieces of information requi ...
CONNECTOR AND TERMINAL PIN KIT
Use the connector and terminal pin kits listed below when replacing
connectors or terminals.
The connector and terminal pin kits contain some of the most common ...
Other materials:
Ground
Ground distribution
Main harness
Engine room harness
Engine control harness
Body harness
...
P0172 Fuel injection system function
DTC Logic
DTC DETECTION LOGIC
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture
ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the
A/F sensors 1. The ECM calculates
the necessary compensation to correct th ...
Both doors mirror defogger don’t operate but rear window defogger operates
Diagnosis procedure
Regarding Wiring Diagram information, refer to DEF-20, "Wiring Diagram".
1. Check door mirror defogger fuse
Check if the following fuse in fuse block (J/B) is blown.
Is the inspection result normal?
Yes >> go to 2.
No >> replace the blown fuse af ...
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