Instruments - Speedometer Buzz/Rattle Noise

90nissan01

Classification: Section:
EL89-019 Electrical

Reference:
TECHNICAL BULLETIN TS89-170

Models:
1987-88 Sentra/Pulsar Date:
December 18, 1989

SENTRA/PULSAR SPEEDOMETER CABLE NOISE


APPLIED MODELS: 1987-88 Sentra (B12)
1987-88 Pulsar (N13)

SERVICE INFORMATION

Some 1987-88 Sentra and Pulsar vehicles may exhibit a rattle or buzzing noise from the center of the instrument panel. This noise occurs at approximately 4000 engine RPM while the vehicle is being driven.

If a customer complains of this type of noise, perform the following diagnostic procedure to determine if the speedometer cable is the cause:

1. Start engine with transmission in neutral (M/T) or park (A/T). Raise RPM to 4000 and hold for 5-10 seconds.

2. Listen for rattling or buzzing from the speedometer head area.

3. Return engine to idle and turn off ignition.

4. Disconnect speedometer cable from transaxle and let hang. Be sure to position the cable so that it isn't touching the engine or transaxle.

5. Repeat steps 1 through 3. If the noise can be heard in step 2, but is not present during step 5, replace the speedometer cable assembly with the improved cable assembly listed in the Parts Information section. If the noise is still present, reinstall the cable and contact the FIXS Hotline for additional information.

FIGURE 1:

FIGURE 2:

The countermeasure speedometer cable is 15 mm longer than the current cable. The additional length may cause an interference with the heater hose in the engine compartment. If an interference between the speedometer cable and the heater hose occurs, bend the speedometer support bracket (Figure 1) to a slightly different angle until about 10 mm of clearance is obtained (Figure 2).
Route speedometer cable as shown:
NOTE: Interference with the heater hose will lessen the effectiveness of the countermeasure cable.
PARTS INFORMATION


PART DESCRIPTION NEW PART NUMBER FORMER PART NUMBER


Speedometer 25050-01Y05 25050-01Y00
Cable Assembly