200SX SE-R L4-1998cc 2.0L DOHC MFI (SR20DE) (1998)
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the switch is ON even if the switch does turn ON. Therefore, the Control unit does not control ground to light up the lamp.
Introduction
Sometimes the symptom is not present when the vehicle is brought in for service. if possible, recreate the conditions present at the time of the incident.
Doing so may help avoid a No Trouble Found Diagnosis. The following tests illustrate ways to simulate the conditions/environment under which the
vehicle experiences an electrical incident.
The tests are broken into the six following topics;
1. Vehicle vibration
2. Heat sensitive
3. Freezing
4. Water intrusion
5. Electrical load
6. Cold or hot start up
Get a thorough description of the incident from the customer. It is important for stimulating the conditions of the problem.
Vehicle Vibration
The problem may occur or become worse while driving on a rough road or when engine is vibrating (idle with A/C on). In such a case, you will want to
check for a vibration related condition.
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. If the problem occurs intermittently, perhaps the problem is caused by corrosion. 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 you are inspecting.
This test may indicate a loose or poorly mounted sensor or relay.
Engine Compartment
There are several reasons a vehicle or engine vibration could cause an electrical complaint. Some of the things to check for are:
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Connectors not fully seated.
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Wiring harness not long enough and are being stressed during engine vibrations or rocking.
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Wires laying across brackets or moving components.
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Loose, dirty or corroded ground wires.
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Wires routed too close to hot components.
To inspect components under the hood, start by verifying the integrity of ground connections. First, check that the system is properly grounded.
Then, check for loose connection by gently shaking the wiring or components as previously explained. Using the wiring diagrams, inspect the
wiring for continuity.
Behind the instrument panel
An improperly routed or improperly clamped harness can become pinched during accessory installation. Vehicle vibration can aggravate a harness
which is routed along a bracket or near a screw.
Under Seating areas
An unclamped or loose harness can cause wiring to be pinched by seat components during vehicle vibration. If the wiring runs under seating areas,
inspect wire routing for possible damage or pinching.
Heat Sensitive