Altima GXE L4-2.4L (KA24DE) (1999)
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3. Connect one probe of the ohmmeter to the load side of the fuse terminal. Connect the other probe to a known good ground.
4. With SW1 open, check for continuity.
Continuity: Short is between fuse terminal and SW1 (point A).
No continuity: Short is further down the circuit than SW1.
5. Close SW1 and disconnect the relay. Put probes at the load side of fuse terminal and a known good ground. Then, check for continuity.
Continuity: Short is between SW1 and the relay (point B).
No continuity: Short is further down the circuit than the relay.
6. Close SW1 and jump the relay contacts with jumper wire. Put probes at the load side of fuse terminal and a known good ground. Then, check for
continuity.
Continuity: Short is between relay and solenoid (point C).
No continuity: Check solenoid, retrace steps.
Voltage Check Method
1. Remove the blown fuse and disconnect all loads (i.e., SW1 open, relay disconnected and solenoid disconnected) powered through the fuse.
2. Turn the ignition key to the ON or START position. Verify battery voltage at the B+ side of the fuse terminal (one lead on the B+ terminal side of
the fuse block and one lead on a known good ground).
3. With SW1 open and the Digital Multimeter (DMM) leads across both fuse terminals, check for voltage.
Voltage: Short is between fuse block and SW1 (point A).
No voltage: Short is further down the circuit than SW1.
4. With SW1 closed, relay and solenoid disconnected and the DMM leads across both fuse terminals, check for voltage.
Voltage: Short is between SW1 and the relay (point B).
No voltage: Short is further down the circuit than the relay.
5. With SW1 closed, relay contacts jumped with fused jumper wire check for voltage.
Voltage: Short is down the circuit of the relay or between the relay and the disconnected solenoid (point C).
No voltage: Retrace steps and check power to fuse block.
Ground Inspection
Ground connections are very important to the proper operation of electrical and electronic circuits. Ground connections are often exposed to moisture,
dirt and other corrosive elements. The corrosion (rust) can become an unwanted resistance. This unwanted resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drastically affect an electronically controlled
circuit. A poor or corroded ground can easily affect the circuit. Even when the ground connection looks clean there can be a thin film of rust on the
surface. When inspecting a ground connection follow these rules:
1. Remove the ground bolt screw or clip.
2. Inspect all mating surfaces for tarnish, dirt, rust, etc.
3. Clean as required to assure good contact.
4. Reinstall bolt or screw securely.
5. Inspect for "add-on" accessories which may be interfering with the ground circuit.
6. If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the wires are clean, securely fastened and
providing a good ground path. If multiple wires are cased in one eyelet make sure no ground wires have excess wire insulation.
Voltage Drop Tests
Voltage drop tests are often used to find components or circuits which have excessive resistance. A voltage drop in a circuit is caused by a resistance
when the circuit is in operation.
Check the wire in the illustration. When measuring resistance with ohmmeter, contact by a single strand of wire will give reading of 0 Ohms. This would