Sentra Sedan L4-1597cc 1.6L SOHC (E16S) (1986)
Inspect the system to find the cause of the symptom. Start the diagnosis by determining the location of the electrical units involved. Inspect each
component to verify that it is mechanically free to operate and that all connectors and harnesses are securely connected and properly routed.
Systematically check the circuits involved, using the Harness Layouts and Power Supply Routing in the service manual. Determine which circuit is the
cause of the incident and whether it is a wiring problem or a component problem.
Repair or replace.
Repair or replace the incident component or electrical circuit.
Verify the system works properly under all conditions.
Once you have repaired the circuit or replaced a component you need to operate the system in all modes and particularly under the circumstances which
resulted in the customers initial complaint.
Incident Simulation Tests
If the symptom is not present when the vehicle is brought in for service, it may be necessary for you to simulate the conditions and environment under
which the incident occurred. Proceeding with a diagnosis when the vehicle is not displaying the symptom may lead the technician to a No Trouble Found
Diagnosis. The following section illustrates ways to simulate the conditions/environments under which the owner experiences an electrical incident.
The section is broken into one of the six following topics:
Cold or Hot Start Up
To properly simulate the condition under which the owner experiences the problem, it is important that you get a thorough description of the incident
from the customer.
If the owner indicates the problem occurs or becomes worse while driving on a rough road or during periods when the engine is vibrating (idle with A/C
on), you will want to check for a vibration related condition. Refer to the illustration below.
Connectors & Harness
Determine which connectors and wiring harness would affect the electrical system you are inspecting. Gently shake each connector and harness while
monitoring the system for the incident you are trying to duplicate. This test may indicate a loose or poor electrical connection.
HINT Connectors can be exposed to moisture. It is possible to get a thin film of corrosion on the connector terminals. A visual inspection may not reveal
this without disconnecting the connector. On intermittent incidents it is a good idea to disconnect, inspect and clean the terminals on related connectors
in the system.
Sensors & Relays
Gently apply a slight vibration to sensors and relays in the system your inspecting. This test may indicate a loose or poorly mounted sensor or relay.