Throttle Position Sensor: Inspection And Adjustment (CAT. F, NO. 001/94)

Publication date: 1994-02-18
Reference number: CAT. F, NO. 001/94

THROTTLE POSITION SENSOR: INSPECTION AND ADJUSTMENT

TECHNICAL SERVICE BULLETIN

Reference Number(s): CAT. F, NO. 001/94, Date of Issue: Date: 2/18/94 Revised: 3/9/94

INSPECTION AND ADJUSTMENT PROCEDURES FOR THE THROTTLE POSITION SENSOR

Model(s): 1989-94 Mazda MPV

1988-94 Mazda 929

1990-94 Mazda 323/protege

1992-94 Mazda MX-3

1990-93 Mazda MX-5,MIATA

1992-94 Mazda 626/MX-6

Category: F

Bulletin No. 001/94

Date: 2/18/94 Revised: 3/9/94

DESCRIPTION

The following are revised procedures for inspection and adjustment of the throttle position sensor. DO NOT replace the throttle position sensor unless these instructions have been followed and the results indicate replacement

These instructions are consistent for all of the above models. Please make your shop personnel aware of this change by copying and distributing this bulletin. Due to the quantity of workshop manuals involved, revisions will be made as reprinting occurs.

INSPECTION PROCEDURE

THROTTLE POSITION SENSOR

Connect a volt meter to the output terminal for the throttle position sensor at the engine control unit. Refer to THROTTLE POSITION SENSOR DATA TABLE
Turn the Ignition on.
Rotate the throttle lever by hand and confirm that the voltage increases smoothly as the throttle valve opens. Refer to THROTTLE POSITION SENSOR DATA TABLE

NOTE: If using the engine signal monitor and adapter harness to read the voltage, connect the monitor and adapter harness to the engine control unit and the engine signal monitor terminal to the read terminal. Refer to THROTTLE POSITION SENSOR DATA TABLE.(Fig 1 )

Fig 1: THROTTLE POSITION SENSOR DATA TABLE

INSPECTION PROCEDURE - IDLE SWITCH

Refer to the appropriate service information.

ADJUSTMENT PROCEDURE - IDLE SWITCH

Adjust according to the appropriate service information.

THROTTLE POSITION SENSOR REPLACEMENT CRITERIAN

(The position sensor should be replaced only if the following occurs.)

If the voltage reading are not within specification and there is no problem found with the wiring harness.
If the idle switch will not adjust.
If the idle switch is normal but the output voltage of the throttle sensor is not within specification.
If the idle switch is normal and the throttle sensor output voltage is within specification but the voltage is not reading smoothly or spikes in the voltage appear halfway between fully closed and fully open throttle.

REPLACEMENT PROCEDURE - THROTTLE POSITION SENSOR

Replace according to the instructions in the appropriate service information.