1994 MAZDA MX-5 engine

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

ROAD TEST (Hold) shift diagram LOCKUP AVAILABLE WHEN COASTING 818 718 - 618 - 518 ' 418 - 3/8 ' 218 - 118 - 018 0 20 (1 2) 40 (25) 60 (37) 80 (50) 100 (63) 120 (75) 140 (87) 160 (99) VEHICLE SPEED kmh {mph} Noise and Vibration Drive the vehicle in 2nd (Hold) and listen closely for any out of the ordinary noise or vibration. The torque converter, propeller shift, 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. L-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 L-range, the shift patterns for Normal mode are the same. 1. Shift the selector lever to L-range and select the Normal mode. 2. Accelerate the vehicle and verify that 1-2 up and downshifts are obtained, and that no third gear, no fourth gear, and no lockup are obtained. 3. Drive in 1 st gear, then decelerate and verify that engine braking effect is felt. 4. While driving in D-range (Hold mode) and third gear, shift the selector lever to L-range and verify that third gear is held until the 3-2 downshift point as shown in the L-range (Hold) shift diagram, and that 2nd gear is held until 2-1 downshift point is achieved. 5. Accelerate the vehicle in L-range (Hold mode) and verify that 1 st gear is held. L-range (Power) shift diagram LOCKUP AVAILABLE WHEN COASTING o 20 (12) 40 (25) 60 (37) 80 (50) 100 163) i 20 (75) 14dp7) 160 pgj VEHICLE SPEED kwh {mph) Gartner Banana

AUTOMATIC TRANSMISSION FLUID (ATF) K AUTOMATIC TRANSMISSION FLUID (ATF) ATF Inspection Level 1. Park the vehicle on level ground. 2. Apply the parking brake and position wheel chocks se- curely to prevent the vehicle from rolling. 3. Warm up the engine until the ATF reaches 60-70°C (1 40-1 58°F). 4. While depressing the brake pedal, shift the selector lever to each range (P-L), pausing momentarily in each range. 5. Shift back to P. Note In some cases it may be necessary to inspect the ATF in the cool range 15-25°C (59-77"F) before warm- ing up the engine. 6. Ensure that the ATF level is in the HOT (65°C) range. Add ATF to the specification, if necessary. ATF type: DexronQII or M-I11 Condition Determine whether the transmission should be disas- sembled by noting. 1. If the ATF is muddy or varnished. 2. If the ATF smells strange or unusual. Gartner Banana

K ELECTRICAL SYSTEM COMPONENTS ELECTRICAL SYSTEM COMPONENTS PREPARATION SST 49 GO1 8 904 Sheet 49 9200 162 Monitor, Engine Signal - 49 DO1 9 902 Adapter Harness For inspection of powertrain control module (transmission) terminal voltage For inspection of powertrain control module (transmission) terminal voltage p@ HOLD For inspection of powertrain control module (transmission) terminal voltage HOLD SWITCH lnspection lnspection of operation 1. Turn the ignition switch from OFF to ON. 2. Verify that the hold indicator light is not illuminated. De- press the hold switch and verify that the hold indicator -J light illuminates. 3. If not as specified, check the terminal voltage of the hold switch. lnspection of voltage 1. Remove the front console. 2. Turn the ignition switch ON. 3. Measure voltage at the hold switch connector. B+: Battery positive voltage Position (V): Voltage Normal (V) Depressed (V) 4. If not as specified, check the continuity of the hold switch. Connector terminal A B+ 0 B 0 0 Gartner Banana

ELECTRICAL SYSTEM COMPONENTS K I POWERTRAIN CONTROL POWERTRAIN CONTROL MODULE (TRANSMISSION) lns~ection 1. kemove the powertrain control module (Transmission). (Refer to page K-45.) 2. Disconnect the control module connectors. 3. Connect the SSTs (Engine Signal Monitor and Adapt- er Harness) to the powertrain control module (Transmis- sion) as shown. 4. Place the SST (sheet) on the Engine Signal Monitor. 5. Turn the ignition switch ON. 6. Measure the terminal voltage at each terminal. 7. If any control module terminal voltage is incorrect, check the related input of output devices and wiring. If no prob- lem is found, replace the powertrain control module (Transmission). Caution Applying voltage to terminals A and B of this SST will damage the SST. 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 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