1997 MAZDA MX-5 instrument cluster

COMPONENT CONNECTOR IDENTIFICATION (1)
Fig. 3: Locating Transmission Component Connectors
ComponentSee Fig.
Engine Control Module (ECM)Fig. 5
Hold Switch(2)
Instrument Cluster(3)
Transmission Control Module (TCM)Fig. 4
Valve Body Solenoids(4)
(1)For connector location see Fig. 3 .
(2)See HOLD SWITCH under COMPONENT TESTING.
(3)See VEHICLE SPEED SENSOR (VSS) under COMPONENT TESTING.
(4)See SOLENOID VALVES under COMPONENT TESTING.

1997 Mazda MX-5 Miata
1997 AUTOMATIC TRANSMISSIONS NC4A-EL Electronic Controls
Microsoft
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Condition
Vehicle speed sensor signal is not input to TCM. Possible causes are:
Vehicle speed sensor malfunction.
Vehicle speedometer sensor malfunction.
Damaged circuits or connectors between sensors and TCM.
Diagnosis & Repair Procedure
1. Ensure all connections are clean and tight. Repair as needed. Turn ignition on. Using voltmeter,
backprobe TCM harness connector. DO NOT disconnect connector. Test drive vehicle.
2. Measure voltage between ground and terminal No. 1P (Green/Red wire) on TCM harness connector.
During test drive voltage should be about 4 volts. When parked, voltage should be less than 1.5 or 7-9
volts. If voltage is within specifications, go to step 5 . If voltage is not within specifications, go to next
step.
3. Turn ignition off. Disconnect negative battery cable. Remove instrument cluster. Disconnect TCM
harness connectors. Ensure continuity exists on Green/Red wire between terminal No. 1P on TCM
connector and terminal No. 2F on instrument cluster harness left connector. Repair as needed. If
continuity exists, go to next step.
4. With combination meter removed, measure voltage between terminals No. 2F and 2D on combination
meter connector using analog voltmeter. Raise and support vehicle. Rotate rear wheels. If voltage pulse is
present, go to next step. If voltage pulse is not present, inspect speedometer cable. Replace as needed. If
cable is okay, replace combination meter or circuit board (as applicable).
5. Clear codes and road test vehicle. Retrieve DTC. If DTC 1720 is still present, replace TCM. If code is no
longer present, problem may be caused by poor connection. Repair as needed.
DTC P1743: TORQUE CONVERTER CLUTCH (TCC) SOLENOID MALFUNCTION
Possible Causes:
Short or open circuit between TCM and solenoid.
TCM malfunction.
Lock-up solenoid malfunction.
Diagnosis & Repair Procedure
1. Ensure all connections are clean and tight. Repair as needed. Turn ignition on. Access TCM connectors.
Using voltmeter, backprobe harness connectors. DO NOT disconnect connectors. Go to next step.
2. Measure voltage between ground and terminal No. 2K (Yellow/Black wire). Battery voltage should be
present with solenoid on and zero volts with solenoid off. If voltage is within specifications, go to step 5 .
If voltage is not within specifications, go to next step.
3. Turn ignition off. Disconnect TCM harness connector. Measure resistance between ground and terminal
No. 2K. If resistance is 13-25 ohms at 68°F (20°C), go to step 5 . If resistance is not 13-25 ohms at 68°F
(20°C),
go to next step.

1997 Mazda MX-5 Miata
1997 AUTOMATIC TRANSMISSIONS NC4A-EL Electronic Controls
Microsoft
Sunday, July 05, 2009 1:35:04 PMPage 18 © 2005 Mitchell Repair Information Company, LLC.

STEERING COLUMN
1995-97 STEERING Mazda Motors Corp. - Steering Columns
DESCRIPTION & OPERATION
Steering columns are designed to be collapsible upon impact. The steering column consists of solid steering
shaft with a lower joint assembly. Some models are equipped with tilt steering. Turn signal, headlight, ignition
and windshield washer/wiper switches are mounted on column. Switches can be serviced by removing steering
wheel and column covers. All models are equipped with air bag restraint system consisting of an driver air bag
module, passenger air bag module (except 1995 MPV and 1995 Protege) and clockspring connector assembly
located in the steering column.
SYSTEM OPERATION CHECK
1. Turn ignition switch to ON or START position. AIR BAG warning light in instrument cluster should
illuminate for about 4-8 seconds, and then turn off. This indicates air bag system is functioning properly.
2. If any of the following conditions exists, air bag system is malfunctioning and requires servicing.
AIR BAG warning light does not illuminate as specified.
AIR BAG warning light remains illuminated for more than 8 seconds.
AIR BAG warning light illuminates while driving.
3. If air bag system components are replaced for any reason, air bag system must be checked for proper
function after repair. Repeat step 1). If AIR BAG warning light does not illuminate as specified, air bag
system is malfunctioning and servicing is required. See AIR BAG RESTRAINT SYSTEM article.
SERVICE PRECAUTIONS
Observe the following precautions when servicing air bag system.
Disable air bag system before servicing any air bag system or steering column component. See AIR BAG
DISABLING & ACTIVATING .
After disabling air bag system, wait at least one minute before servicing. Air bag system voltage is
maintained for approximately one minute after system is disabled. Failure to wait one minute before
servicing system may cause accidental air bag deployment and possible personal injury.
Obtain radio code number from customer and deactivate radio anti-theft function (if equipped) before
disconnecting battery.
Because of the critical operation requirements of system, DO NOT service any air bag system
component. Repairs are made by replacement only.
DO NOT use an ohmmeter to check resistance of air bag module, as it may cause air bag deployment.
When carrying a live (undeployed) air bag module, ensure trim cover is pointed away from your body. WARNING:To avoid injury from accidental air bag deployment, read and carefully
follow all WARNINGS and SERVICE PRECAUTIONS
.

1997 Mazda MX-5 Miata
STEERING COLUMN 1995-97 STEERING Mazda Motors Corp. - Steering Columns

1997 Mazda MX-5 Miata
STEERING COLUMN 1995-97 STEERING Mazda Motors Corp. - Steering Columns
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Fig. 16: Horn Circuit
INSTRUMENT CLUSTER

1997 Mazda MX-5 Miata
1997 System Wiring Diagrams Mazda - Miata
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Sunday, July 05, 2009 1:31:52 PMPage 33 © 2005 Mitchell Repair Information Company, LLC.

Fig. 17: Instrument Cluster Circuit
INTERIOR LIGHTS

1997 Mazda MX-5 Miata
1997 System Wiring Diagrams Mazda - Miata
Microsoft
Sunday, July 05, 2009 1:31:52 PMPage 35 © 2005 Mitchell Repair Information Company, LLC.