How to check the switch and relay for the kickdown system on Mazda MX-5 Miata?

To test the switch, find it on top of the accelerator pedal. Insert the positive probe of the voltmeter into terminal C (kickdown switch terminal; yellow/green wire). Ground the negative probe and do not unplug the connector. Switch the ignition key to the On position without starting the engine and lightly press the accelerator pedal by hand, checking the voltmeter; from fully released to about 7/8, the voltmeter should read less than 1.5 volts and from 7/8 to full throttle about 12 volts. Subsequently, after moving the voltmeter positive probe to terminal A (which is the 4-3 switch terminal; green-blue wire), push the accelerator pedal again. You should get less than 1.5 volts (i.e. fully released position to about 5/8 of the travel) and about 12 volts (from 3/4 to full throttle). When you have either voltage that is not correct, check the switch continuity. Unplug the switch connector, and connect an ohmmeter between terminals C and D (kickdown switch terminals). Depress the switch plunger about 1/4 inch. You should show continuity. Subsequently, take the ohmmeter measurement at A & B (the 4-3 switch terminals) and compress the switch plunger about one-eighth to three-sixteenths inch; continuity is expected. Should the continuity test fail in either case, replace the switch. If the readings are correct, adjust the switch by unplugging the connector, loosening the locknuts and unscrewing it (don't remove it). Put the accelerator pedal on the floor, turn the switch clockwise until you hear an audible 'click-on', then turn the switch another 1/4-turn clockwise and release the pedal. Reconnect the electrical connector of the switch, hold the switch in position and tighten the locknuts. To check the kickdown relay, secure-jack the car up and find the relay. The relay is middle of the three relays on the left side of the transmission. Now unplug it. Attach an ohmmeter to relay terminals A and D to check for continuity. The reading should be infinite. With the ohmmeter still connected, connect a 12-volt battery across terminals B and C. A continuity check should now register. Substitute the relay if it does not pass the test. To check the kickdown solenoid, you will need to drain about 1-1/8 quarts of fluid from the transmission. The kickdown solenoid is located on the left side of the transmission just forward of the rear extension housing. Unplug its electrical connector from the unit and unscrew from the transmission. Now, keep a 12volt battery connected between the solenoid terminal and solenoid body. You will observe solenoid plunger extending whenever the battery is connected. Replace it, if solenoid is not functioning properly.

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Mazda MX-5 Miata Relay Part Number: UM46-67-730
$15.04 MSRP: $20.05
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Product Specifications
- Other Name: Relay, N.O.
- Replaces: PE01-67-730
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2010-2024 Mazda MX-5 Miata | 100th Anniversary Special Edition, 25th Anniversary Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF GT, RF Grand Touring, Special Edition, Sport, Touring | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Relay Part Number: AJ51-18-821
$10.43 MSRP: $13.91
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Product Specifications
- Other Name: Relay, Circuit; Circuit Breaker, ECM Relay, Fuel Pump Relay
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2025 Mazda MX-5 Miata | 100th Anniversary Special Edition, 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF Grand Touring, SV, Special Edition, Sport, Touring | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Relay Part Number: L110-67-730
$32.99 MSRP: $43.99
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Product Specifications
- Other Name: RELAY,N.O.(BLACK 4 PIN); Fan Relay
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2015 Mazda MX-5 Miata | 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, SV, Special Edition, Sport, Touring | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Relay Part Number: D10A-67-730
$11.70 MSRP: $15.60
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Product Specifications
- Other Name: Relay, Normal Open; Horn Relay
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2016-2024 Mazda MX-5 Miata | 100th Anniversary Special Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Relay Part Number: UM46-67-720
$21.96 MSRP: $29.29
You Save: $7.33 (26%)
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Product Specifications
- Other Name: Relay, Transfer
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2016-2025 Mazda MX-5 Miata | 100th Anniversary Special Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Relay Part Number: B115-67-730
$26.15 MSRP: $34.88
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Product Specifications
- Other Name: Relay, N.O.; Fan Relay, Horn Relay
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2012 Mazda MX-5 Miata | Base, Club Spec, Grand Touring, SV, Special Edition, Sport, Touring | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Relay Part Number: B110-67-730
$31.11 MSRP: $41.50
You Save: $10.39 (26%)
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Product Specifications
- Other Name: Horn Relay
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2015 Mazda MX-5 Miata | 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, SV, Special Edition, Sport, Touring | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Relay Part Number: G110-67-730
$27.83 MSRP: $37.10
You Save: $9.27 (25%)
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Product Specifications
- Other Name: Relay, Normal Open; Fan Relay
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2016-2025 Mazda MX-5 Miata | 100th Anniversary Special Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF GT, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda MX-5 Miata Flasher Part Number: F151-66-830
$64.70 MSRP: $86.29
You Save: $21.59 (26%)
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Product Specifications
- Other Name: Flasher Unit
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2015 Mazda MX-5 Miata | 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, SV, Special Edition, Sport, Touring | 4 Cyl 2.0 L GAS

Mazda MX-5 Miata Relay

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Mazda MX-5 Miata Relay Parts and Q&A

Relay
UM46-67-730
Q:
How to check the switch and relay for the kickdown system on Mazda MX-5 Miata?
A:
To test the switch, find it on top of the accelerator pedal. Insert the positive probe of the voltmeter into terminal C (kickdown switch terminal; yellow/green wire). Ground the negative probe and do not unplug the connector. Switch the ignition key to the On position without starting the engine and lightly press the accelerator pedal by hand, checking the voltmeter; from fully released to about 7/8, the voltmeter should read less than 1.5 volts and from 7/8 to full throttle about 12 volts. Subsequently, after moving the voltmeter positive probe to terminal A (which is the 4-3 switch terminal; green-blue wire), push the accelerator pedal again. You should get less than 1.5 volts (i.e. fully released position to about 5/8 of the travel) and about 12 volts (from 3/4 to full throttle). When you have either voltage that is not correct, check the switch continuity. Unplug the switch connector, and connect an ohmmeter between terminals C and D (kickdown switch terminals). Depress the switch plunger about 1/4 inch. You should show continuity. Subsequently, take the ohmmeter measurement at A & B (the 4-3 switch terminals) and compress the switch plunger about one-eighth to three-sixteenths inch; continuity is expected. Should the continuity test fail in either case, replace the switch. If the readings are correct, adjust the switch by unplugging the connector, loosening the locknuts and unscrewing it (don't remove it). Put the accelerator pedal on the floor, turn the switch clockwise until you hear an audible 'click-on', then turn the switch another 1/4-turn clockwise and release the pedal. Reconnect the electrical connector of the switch, hold the switch in position and tighten the locknuts. To check the kickdown relay, secure-jack the car up and find the relay. The relay is middle of the three relays on the left side of the transmission. Now unplug it. Attach an ohmmeter to relay terminals A and D to check for continuity. The reading should be infinite. With the ohmmeter still connected, connect a 12-volt battery across terminals B and C. A continuity check should now register. Substitute the relay if it does not pass the test. To check the kickdown solenoid, you will need to drain about 1-1/8 quarts of fluid from the transmission. The kickdown solenoid is located on the left side of the transmission just forward of the rear extension housing. Unplug its electrical connector from the unit and unscrew from the transmission. Now, keep a 12volt battery connected between the solenoid terminal and solenoid body. You will observe solenoid plunger extending whenever the battery is connected. Replace it, if solenoid is not functioning properly.

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Genuine Mazda MX-5 Miata Relay

9 Relays found

Mazda MX-5 Miata Relay Part Number: UM46-67-730

Mazda MX-5 Miata Relay Part Number: AJ51-18-821

Mazda MX-5 Miata Relay Part Number: L110-67-730

Mazda MX-5 Miata Relay Part Number: D10A-67-730

Mazda MX-5 Miata Relay Part Number: UM46-67-720

Mazda MX-5 Miata Relay Part Number: B115-67-730

Mazda MX-5 Miata Relay Part Number: B110-67-730

Mazda MX-5 Miata Relay Part Number: G110-67-730

Mazda MX-5 Miata Flasher Part Number: F151-66-830

Mazda MX-5 Miata Relay

Mazda MX-5 Miata Relay Parts and Q&A

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