1994 MAZDA MX-5 sensor

K ON-BOARD DIAGNOSIS SYSTEM - -- )IAGNOSTIC TROUBLE CODE N0.12 THROTTLE POSITION SENSOR ACTION I STEP INSPECTION Are there any poor connections at throttle position sensor and powertrain control module (transmission) connector or termi- nal? Yes Repair or replace connector I Go to next step Go to step 5 Connect a circuit tester to terminal as shown Is input voltage of throttle position sensor (TVO) at powertrain control module (transmission) OK? page K-45 1 (+) term. I (-) term. I Voltage (v)/ Condition 1 Yes No lgnition Go to next step ' 2T Ground valve Approx. closed I 0.8--4.3 position to wide open 1 throttle Go to next step Connect a circuit tester to terminals as shown Is input voltage of throttle position sensor (VREF) at powertrain control module (transmission) OK? page K-44 (+) term. (-) term. Voltage (V) Condition Approx. lgnition 4.55 ;p" 2A Ground Ignition 0 switch OFF Yes Check voltage at terminal 21 of powertrain control module (En- gine) Voltage: 4.5--5.5V (Ignition switch ON) If OK, go to next step If not OK, repair wiring andlor connector Check wiring and connectors form Powertrain control module (transmission) to throttle position sensor If OK, go to next step If not OK, repair wiring andlor connector Is throttle position sensor OK? Section F Yes No Yes Adjust or replace throttle position sensor t@? section F I Replace powertrain control module (transmission) t@? page K-45 is connect the negative battery cable for at least 20 seconds and depress the brake pedal Connect the battery cable and recheck for diagnostic trouble code Is diagnostic trouble code displayed? Daae K-21 Intermittent poor connection Check for cause Gartner Banana

ROAD TEST K Evaluation I No lockup shift Condition No 1-2 up or downshift No 2-3 up or downshift No 3-4 up or downshift I Stuck lockup control solenoid valve Stuck locku~ control valve Possible Cause Stuck 1-2 shift solenoid valve Stuck 1-2 shift valve Stuck 2-3 shift solenoid valve Stuck 2-3 shift valve Stuck 3-4 shift solenoid valve Stuck 3-4 shift valve Incorrect shift point I No enaine brakina effect I Worn clutches, brakes I Misadjusted throttle position sensor Sticking shift valves Excessive shift shock or slippage Noise and Vibration Drive the vehicle in fourth gear (lockup), fourth gear (no lockup), and third gear (Hold) and listen closely for any out of the ordinary noise or vibration. The torque converter, propeller shaft, and differential can be sources of abnormal noise and vibration if they are not functioning properly. Check these when searching for sources of noise and vibration. Stuck accumulators Stuck or no one-way check orifice Stuck 3-2 control solenoid valve Stuck 3-2 control valve Worn clutches, brakes, or one-way clutch Kickdown Drive the vehicle in fourth gear, third gear, and 2nd gear and check that kickdown occurs for 4-+3,4-+2, 4+1,3+2,3+1, 2+1, and that the shift points are as shown in the shift diagram. ,U (Refer to pages K-29, 30.) S-RANGE TEST Shift Pattern For this test it is not necessary to inspect shift shock and shift points, since they are almost exactly the same as those for the D-range test. However, in the D-range (Normal) shift diagram, the shift points are different. In S range, the shift patterns for Normal mode are the same. 1. Shift the selector lever to S range and select the Normal mode. 2. Accelerate the vehicle and verify that 1-2 and 2-3 up-and downshifts are obtained, and that no fourth gear and no lockup (below approx. 100 kmlh (63 mph}) are obtained. 3. While driving in S range (Normal mode) and third gear, select the Hold mode and verify that third gear is held until ihe 3-2 downshift point as shown in the S range (Hold) shift diagram is achieved. 4. Accelerate the vehicle in S range (Hold mode) and verify that 2nd gear is held. S-range (Power) shift diagram LOCKUP AVAILABLE WHEN ACCELERATING AND CRUSING LOCKUP AVAILABLE WHEN COASTING -. - VEHICLE SPEED kmlh (rnph} Gartner Banana

ELECTRICAL SYSTEM COMPONENTS K ATF THERMOSENSOR Inspection 1. Refer to "Replacement" below for removal of the ATF thermosensor. 2. Place the ATF thermosensor in ATF with a thermometer as shown, and heat the ATF gradually. 3. Measure resistance between the terminals of the ATF thermosensor. ATF temperature- {OF) 1 Resistance (kR) 20 (68) 2.5 4. If not correct, replace the ATF thermosensor. 5. Refer to "Replacement" for installation of the ATF ther- mosensor. Replacement 1. Disconnect the negative battery cable. 2. On level ground, jack up the vehicle and support it evenly on safety stands. 3. Disconnect the ATF thermosensor connector. 4. Remove the ATF thermosensor. 5. Install the new ATF thermosensor. Tightening torque: 7.9-1 0.7 N-m (80-11 0 kgf-cm, 70-95.4 in-lbf) 6. Connect the ATF thermosensor connector. 7. Connect the negative battery cable. VEHICLE SPEED PULSE GENERATOR Inspection 1. Disconnect the negative battery cable. 2. On level ground, jack up the vehicle and support it evenly on safety stands. 3. Disconnect the vehicle speed pulse generator connec- tor. 4. Measure resistance between the terminals of the vehicle speed pulse generator. Resistance: 24552 5. If not correct, replace the vehicle speed pulse generator. 6. Connect the vehicle speed pulse generator connector. 7. Connect the negative battery cable. Gartner Banana

K ELECTRICAL SYSTEM COMPONENTS Terminal Voltage Chart (Reference Data) C Terminal B+: Battery positlve voltage y Hold indicator light Condition Connected to 16 (Output) B+ Below 1.5V - - - No hold mode Hold mode FAT terminal (data link connector) I IC Voltage - - Voltmeter B+ Below 1.5V or B+ I C (Output) - - -- -- - - - -- -- - - - - - - - A- +terminal Normal If malfunction resent Ground (fluctuating) I Code Sianal I TAT terminal wounded -terminal Powertrain control module (Engine) (terminal R) TAT terminal (data link connector) - I - Below 2.5V 1 N or P range 1 D (Output) I Bt ]Other ranges I 1 E (lnput) 1 F 1 G I ATF thermosensor I 1G 3.3V ATF temperature 25OC {77"F) Ground B+ Switch depressed .-,/ -~ - 1 H (Input) 1 I Hold switch 1 OV ] Switch released I I 1 J (Output) 1 K 1 M (lnput) Cruise control unit I lM 1 N (lnput) Powertrain control module (Engine) (terminal 3M) 1 lN Idle switch B+ OV - -- Ve Accelerator pedal released I ADDrox. 4V While drivina Water temperature above 60°C {I 40°F) Accelerator pedal de~ressed Below 1.5V Vehicle speed sensor 1 P (lnput) 1 P I Approx' I Ignition switch ON I 4.4-5.5V 2A (Input) Throttle position sensor 1 2A . . . - . - . OV I lanition switch OFF 1 ParWneutral switch (N and P ranges) I OV I N or P ranae I 26 (Input) I B+ I Other ranaes I Gartner Banana

TRANSMISSION K 1. Shift rod 12. Lockup solenoid connector 2. Undercover 13. Oil pipe 3. Performance rod 14. Harness 4. Exhaust pipe 15. Power plant frame (PPF) 5. Propeller shaft Removal Note ............. page K-48 Removal .................... section L 1 6. Undercover 6. Speedometer cable 17. Torque converter Nut - 7. Vacuum hose 18. Starter u 8. Parklneutral switch connector 19. Transmission mount bolt 9. Vehicle speed pulse generator connector 20. Transmission 10. Solenoid connector Removal Note ............. page K-49 11. ATF thermosensor connector Gartner Banana

TRANSMISSION K Transmission Caution Shaking the transmission could damage the crank angle sensor on the engine. When remov- ing the transmission, do not shake it up and down or side to side. Remove the transmission. Gartner Banana

K TRANSMISSION 1. Transmission 10. ATF thermosensor connector Installation Note . . . . . . . . . . page K-149 11. Solenoid connector 2. Transmission mount bolt 12. Vehicle speed pulse generator connector 3. Starter 13. Parklneutral switch connector 4. Torque converter bolt 14. Vacuum hose lnstallation Note . . . . . . . . . . page K-149 15. Speedometer cable 5. Under cover 16. Propeller shaft 6. Power plant frame (PPF) Installation . . . . . . . . . . . . . . . . . . section L lnstallation Note . . . . . . . . . . page K-149 17. Exhaust pipe 7. Harness 18. Performance rod -1 8. Oil pipe 19. Undercover 9. Lockup solenoid connector 20. Shift rod Gartner Banana

FRONT AXLE M FRONT AXLE PREPARATION SST 49 01 18 850C Puller, ball joint 49 VOOl 795 For installation of Installer, oil sensor rotor seal (AW 49 0839 425C Puller set, bearing For disconnection of lower arm ball joint For disconnection of tie-rod end and upper arm ball joint For removal of sensor rotor (AW 49 0727 575 Puller, ball joint For removal of sensor rotor (ABS) 49 F027 007 Attachment @72 Gartner Banana