SECTION T MAZDA MX-5 1994 Owners Manual

ON-BOARD DIAGNOSIS SYSTEM K )IAGNOSTIC TROUBLE CODE N0.06 VEHICLE SPEED SENSOR INSPECTION STEP ACTION Repair or replace connector Are there any poor connections at vehicle speed sensor and powertrain control module (Transmission) connectors? Yes Go to next step Connect a circuit tester to terminal as shown. Is input voltage of vehicle speed sensor at powertrain control module (Transmission) OK? page K-44 Yes Go to step 5 1 (+) term. I (-) term. ( Voltage (v)( Condition I Go to next step Below 1.5 While Remove instrument cluster Is there continuity between terminal 2D of meter connector and terminal 1 M of pow- ertrain control module (Transmission) Yes Go to next step Repair or replace wiring and/or connector Connect circuit tester to terminals 2D and 2A of meter connector Does pointer of circuit tester move slightly when front wheels are slowly turned? Yes Go to next step Replace vehicle speed sensor section T Disconnect the negative battery cable for at least 20 seconds and depress the brake pedal Connect the battery cable and recheck for code. Is diagnostic trouble code displayed Dane K-21 Yes Replace powertrain control module (transmission) page K-45 Intermittent poor connection check for cause Gartner Banana

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

MECHANICAL SYSTEM TEST K Procedure ENGAGE PARKING BRAKE IDLE SPEED 1. Connect a tachometer to the engine. 2. Start the engine and check the idle speed in P range. (Refer to section F.) Idle speed: 750-450 rpm 3. Shift the selector lever to R range. Caution If the accelerator pedal is pressed for longer than 5 seconds while the brake pedal is pressed, the transmission could be damaged. Therefore, do steps 4 and 5 within 5 seconds of each oth- er. 4. Firmly depress the foot brake with the left foot, and gently depress the accelerator pedal with the right. 5. When the engine speed no longer increases, quickly read the engine speed and release the accelerator. 6. Shift the selector to N and let the engine idle for 1 minute or more to cool the ATF. 7. Perform the stall test for the following ranges in the same manner. (1 ) D range u (2) S range (3) L range Engine stall speed: 1,90&2,lOO rpm Gartner Banana

MECHANICAL SYSTEM TEST TIME LAG TEST If the selector lever is shifted while the engine is idling, there will be a certain time lapse, or time lag, before shock is felt. This step checks this time lag for checking condition of the 1-2, N-R/2-3 and N-D L/ accumulators, front, rear and one-way clutches, 2nd brake band, and low and reverse brake. Preparation Perform the preparation procedure shown in the STALL TEST. (Refer to page K-22.) Procedure IDLE SPEED 1. Start the engine and check the idle speed in P range. (Refer to section F.) u Idle speed: 750--850 rpm 2. Shift from N range to D range. 3. Use a stopwatch to measure the time it takes from shifting until shock is felt. 4. Shift the selector to N and let the engine idle for 1 minute or more to cool the ATF. 5. Do the time lag test for the following shifts in the same manner. Make three measurements for each test and average the results. (1) N 4 D range (Normal mode) (2) N -+ D range (Hold mode) (3) N -+ R range .......................................... Specified time lag: N -t D range 0.5-46 second ..................... N -+ R range ... .............. 0.75-0.85 second Evaluation of Time Lag Test - I Condition N -c D (Hold) shifting More than specification Less than specification More than specification Less than specification N -+ R shifting I More than specification Less than specification Rear clutch slipping Excessive line pressure - lnsufficient line pressure Rear clutch slipping 2nd brake band slipping - 1-2 accumulator not operating properly Excessive line pressure lnsufficient line pressure Low and reverse brake slipping Front clutch slipping N-R/2-3 accumulator not operating properly Excessive line pressure K-25 Gartner Banana

K MECHANICAL SYSTEM TEST LINE PRESSURE TEST This test measures line pressures for checking the hydraulic components and inspecting for oil leakage. Preparation d 1. Perform the preparation procedure shown in the STALL TEST. (Refer to page K-22.) 2. Connect a tachometer to the engine. Warning Removing the square-head plug when the ATF is hot is dangerous. Hot ATF can come out of the opening and badly burn. Before removing the square-head plug, allow the ATF to cool. 3. Connect the SST to the line pressure inspection hole(s). Procedure 1. Start the engine and check the idle speed in P range. (Refer to section F.) Idle speed: 750--850 rpm * 2. Shift the selector lever to D range and read the line pressure at idle. Caution If the accelerator pedal is pressed for longer than 5 seconds while the brake pedal is pressed, the transmission could be damaged. Therefore, do steps 3 and 4 within 5 seconds of each oth- er. 3. Depress the brake pedal firmly with the left foot and gradually depress the accelerator pedal with the right foot. 4. Read the line pressure as soon as the engine speed becomes constant, then release the accelerator .- pedal. 5. Shift the selector to N and let the engine idle for 1 minute or more to cool the ATF. 6. Read the line pressure at idle and at the engine stall speed for each range in the same manner. Gartner Banana

ROAD TEST K ROAD TEST A road test is necessary to inspect for problems in the different gear ranges. If a range or function tar- b geted by the road test is found to have any problem, refer to the ELECTRONIC SYSTEM COMPONENT segment or the TRANSMISSION, OIL COOLER, DRIVE PLATE, and SHIFT MECHANISM segments of this section. Do the road test only when the ATF is 50-80°C (1 22-1 76°F). D-RANGE TEST Shift Point, Shift Pattern, and Shift Shock 1. Shift the selector lever to D range and select the Normal mode. 2. Accelerate the vehicle with half-and wide open throttle opening. 3. Verify that 1-2, 2-3, and 3-4 upshifts, downshifts, and lockup are obtained. The shift points must be as shown in the D range (Normal) shift diagram. Note There is fourth gear is any of the following conditions. A The cruise control is operating, and there is an 8kmIh (5 mph} difference between the preset cruise speed and the vehicle speed. B The SET or RESUME switch is ON. There is no lockup when water temperature is below 50°C (1 22°F) or in the throttle valve closed posi- tion. 4. Check the upshifts for shift shock or slippage in the same manner. 5. While driving in overdrive, shift the selector lever to S range and verify that 4-3 downshift immediately occurs, then decelerate and verify that engine braking effect is felt in only third gear and 2nd gears. D-range (Normal) shift diagram p'yJ ..,,*sw.. LOCKUP AVAILABLE WHEN ACCELERATING AND CRUSING LOCKUP AVAILABLE WHEN COASTING 0 20 (1 2) 40 (25) 60 (37) 80 {50) 100 (63) 1 20 (75) 140 (87) 1 60 (99) VEHICLE SPEED kmlh {mph) 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

K TRANSMISSION On-vehicle Removal 1. Disconnect the negative battery cable. 2. On level ground, jack up the vehicle and support it evenly on safety stands. 3. Remove the exhaust pipe. (Refer to page K-46.) 4. Remove the propeller shaft. (Refer to section L.) 5. Disconnect the speedometer cable. 6. Support the transmission with a transmission jack. 7. Remove the power plant frame. (Refer to page K-46.) 8. Remove the extension housing and gasket, making sure to allow any ATF to drain into a container. On-vehicle Installation 1. lnstall a new gasket on the transmission case. 2. lnstall the extension housing. Tightening torque: 20-24 N-m (2.0-2.5kgf-m, 15--18 ft-lbf} i/ 3. Install the power plant frame. (Refer to page K-148.) 4. Connect the speedometer cable. 5. lnstall the propeller shaft. (Refer to section L.) 6. Install the exhaust pipe. (Refer to page K-148.) 7. Add ATF, and check the ATF level. (Refer to page K-35.) Gartner Banana

TRANSMISSION K Inspection Check for damage, wear, or oil leaking from the oil seal. Replace if necessary. OIL SEAL Preparation SST On-vehicle Replacement 1. Remove the exhaust pipe. (Refer to page K-46.) 2. Remove the propeller shaft. (Refer to section L.) 3. Remove the oil seal from the extension housing. 4. Apply ATF to outer periphery and lip surface. 5. Install the new oil seal by using the SST. 6. lnstall the propeller shaft. (Refer to section L.) 7. Install the exhaust pipe. (Refer to page K-148.) w 49 GO30 795 For installation of oil Installer, oil seal 49 GO30 797 Handle (Part of 49 GO30 795) For installation of oil seal 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