Electrical Noise - Speed Sensor Modification (EL92-002R)

Publication date: 1992-04-10
Reference number: EL92-002R
Supersedes refnos: EL92-002

ELECTRICAL NOISE - SPEED SENSOR MODIFICATION

TECHNICAL SERVICE BULLETIN

Reference Number(s): EL92-002, EL92-002R, Date of Issue: April 10, 1992

Superceded Bulletin(s): EL92-00

Model(s): 1989-91 Toyota Cressida

Reference: Electrical

Bulletin No.: EL92-002 (Revised)

Date: April 10, 1992

Symptom: Electrical Noise

The Cressida (MX83E) Speed Sensor #1 has been modified to reduce electrical noise.

Service parts (speedometer) for early production vehicles (1989- 1990 MY) have an improved designed reed switch (Speed Sensor #1). See Fig 1. The part number has been changed for easy identification.
Vehicles built after 7/91 (late 1991 MY) received a production change to the #1 Speed Sensor and Instrument Cluster Printed Circuit. These changes involved the following:

A: Addition of a filter circuit on the Instrument Cluster Printed Circuit for the #1 Speed Sensor.

B: Reduction in operating voltage of the reed switch contained in the speedometer to reduce contact pitting.

1991 model year vehicles built prior to the 7/91 production change can be retro-fitted with the above improvement. This requires replacement of both the #1 Speed Sensor and the Instrument Cluster Printed Circuit (see part number information).

Fig 1: Reed Switch Modification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

The # 1 Speed Sensor operating function:

PRODUCTION EFFECTIVE

From VIN	P/D
JT2MX83E#M0083500	7/91

Prev. Part No.	New Part No.	Description	Application
8311 0-2A620	* 83110-2A830	Speedometer Assembly	1989-90 MX
83110-2A622	** 83110-2A623	Speedometer Assembly	1991 MX
83247-2A750	* 83247-2C170	Plate, Meter Circuit	1991 MX
N/A	** 90099-00917	Screw	1991 MX
* Service replacement parts for 1980-90 Cressidas. Parts are interchangeable.
** If a Speedometer with the new style Speed Sensor (P/N: 83110-2A623) is installed on a vehicle produced between 8/90 - 7/91, a new Meter Plate Circuit (83247-2C170) and one (1) additional screw (90099-00917) are also required. See Fig 2.

Fig 2: Additional Screw Locations