instrument cluster MAZDA MX-5 1994 User Guide

T INSTRUMENT CLUSTER Symptom: Water temperature gauge does not operate. 05UOTX-466 Preparation SST ( ) ... CANADA ONLY I 45UOTX-036 49 0839 285 Checker, fuel and thermometer 05UOTX-052 Step 1 1. Disconnect the water temperature sensor connector. 2. Connect the red lead of the SST to terminal A of the con- nector and the black lead to ground. 3. Turn the ignition switch to ON. 4. Set the SST to the resistance values shown in the figure. To get an accurate reading, wait 2 minutes after setting each value. 5. Verify that the water temperature gauge indicates the correct values. The allowable indication error is twice the width of the needle. For inspection of gauges Gauge display I Action Correct Incorrect I ( ) ... CANADA ONLY 45UOTX-038 T-26 Replace water temperature sensor Go to Step 2 Gauge display Correct Step 2 1. Remove the instrument cluster. (Refer to page T-29.) 2. Apply battery positive voltage to terminal 2K of the instrument cluster and connect terminal 2J of the instru- ment cluster to ground. 3. Connect the red lead of the SST to terminal 2L of the instrument cluster and the black lead to ground. 4. Set the SST to the resistance values shown in the figure. To get an accurate reading, wait 2 minutes after setting each value. 5. Verify that the water temperature gauge indicates the correct values. The allowable indication error is twice the width of the needle. Action Repair wiring harness (Instrument cluster - Water temperature sensor) I Incorrect I ReDlace water tem~erature aauae I Gartner Banana

INSTRUMENT CLUSTER T Symptom: Fuel gauge does not operate. L, Preparation SST Step 1 1. Disconnect the connector from the fuel gauge sender unit. 2. Connect the red lead of the SST to the A (Y) terminal wire and the black lead to ground. 3. Turn the ignition to ON. 49 0839 285 Checker, fuel and thermometer 4. Set the SST to the resistance values shown in the figure. To get an accurate reading, wait 2 minutes after setting each value. 5. Verify that the gauge indicates the correct values. The al- lowable indication error is twice the width of the needle. For inspection of gauges Gauge display Action I Step 2 1. Remove the instrument cluster. (Refer to page T-29.) 2. Apply battery positive voltage to terminal 2K and ground to terminal 2J. 3. Connect the red lead of the SST to terminal 1 A and the black lead to ground. Correct Incorrect 4. Set the SST to the resistance values shown in the figure. To get an accurate reading, wait 2 minutes after setting each value. 5. Verify that the gauge indicates the correct values. The al- lowable indication error is twice the width of the needle. Replace fuel gauge sender unit Go to Step 2 ( Gauge display I Action I Correct Incorrect Repakwiring harness (Instrument cluster - Fuel gauge sender unit) Replace fuel gauge Gartner Banana

T INSTRUMENT CLUSTER Symptom: Oil pressure gauge does not operate. 05UOTX-468 Preparation SST I 49 0839 285 For inspection of Checker, fuel gauges and thermometer Step 1 1. Disconnect the connector from the oil pressure sensor. 2. Connect the red lead of the SST to the A (YIR) terminal wire and the black lead to ground. 3. Turn the ignition switch ON. 4. Set the SST to the resistance values shown in the figure. To get an accurate reading, wait 2 minutes after setting each value. 5. Verify that the gauge indicates the correct values. The al- lowable indication error is twice the width of the needle. I Incorrect I GO to step 2 Gauge display Correct Step 2 1. Remove the instrument cluster. (Refer to page T-29.) 2. Apply battery positive voltage to terminal 2K and ground to terminal 2J. 3. Connect the red lead of the SST to terminal 26 and the black lead to ground. Action Replace oil pressure sensor 4. Set the SST to the resistance values shown in the figure. To get an accurate reading, wait 2 minutes after setting each value. 5. Verify that the gauge indicates the correct values. The al- lowable indication error is twice the width of the needle. Incorrect I Replace oil pressure gauge Gauge display Correct Action Repair wiring harness (Instrument cluster - Oil pressure sensor) Gartner Banana

INSTRUMENT CLUSTER T REMOVAL 1 INSTALLATION Remove and install as shown in the figure. INSTRUMENT CLUSTER DISASSEMBLY 1 ASSEMBLY Disassemble and assemble as shown in the figure. u Gartner Banana

T INSTRUMENT CLUSTER Standard indication (kmlhl I 80 I 80-84 45UOTX-047 1 Standard Indication 1 Allowable ranae I Allowable range (kmlhl Standard indication (MPH) 30 WATER TEMPERATURE GAUGE Preparation SST Allowable range (MPH) 30-32 SPEEDOMETER lnspection Note .-,' Tire wear and improper inflation will increase speedo- meter error. 1. Using a speedometer tester, check the speedometer for allowable indication error, and check the operation of the odometer. Replace if necessary. 2. Check the speedometer for fluctuation and/or abnormal noise. If there is fluctuation or if the speedometer does not move, remove and inspect the speedometer cable. If it is in good condition, replace the speedometer as- sembly. TACHOMETER lnspection 1. Connect a test tachometer to the engine, and start the engine. 2. Check the tachometer for allowable indication error. Re- place if necessary. lnspection 1. Remove the instrument cluster. (Refer to page T-29.) 2. Apply battery positive voltage to terminal 2K and ground to terminal 2J. 3. Connect the red lead of the SST to terminal 2L and the black lead to ground. 49 0839 285 Checker, fuel and thermometer For inspection of gauges ( ) ... CANADA ONLY I I 45UOTX-050 183R 2on (I sn) 4. Set the SST to the resistance values shown in the figure. To get an accurate reading, wait 2 minutes after setting each value. 5. Verify that the gauge indicates the correct values. The al- lowable indication error is twice the width of the needle. 6. If not as specified, replace the water temperature gauge. -/' Gartner Banana

INSTRUMENT CLUSTER T FUEL GAUGE Preparation SST f OIL PRESSURE GAUGE Preparation SST L lnspection 1. Remove the instrument cluster. (Refer to page T-29.) 2. Apply battery positive voltage to terminal 2K and ground to terminal 2J. 3. Connect the red lead of the SST to terminal 1A and the black lead to ground. 4. Set the SST to the resistance values shown in the figure. To get an accurate reading, wait 2 minutes after setting each value. 5. Verify that the gauge indicates the correct values. The al- lowable indication error is twice the width of the needle. 6. If not as specified, replace the fuel gauge. 49 0839 285 Checker, fuel and thermometer For inspection of gauges Inspection 1. Remove the instrument cluster. (Refer to page T-29.) 2. Apply battery positive voltage to terminal 2K and ground to terminal 2J. 3. Connect the red lead of the SST to terminal 2B and the black lead to ground. 49 0839 285 Checker, fuel and thermometer For inspection of gauges Gartner Banana

T INSTRUMENT CLUSTER 4. Set the SST to the resistance values shown in the figure. To get an accurate reading, wait 2 minutes after setting each value. 5. Verify that the gauge indicates the correct values. The al- \J lowable indication error is twice the width of the needle. 6. If not as specified, replace the oil pressure gauge. PRINTED CIRCUIT lnspection 1. Remove the instrument cluster. (Refer to page T-29.) 2. Check the printed circuit for damage or oxidization. 3. If necessary, replace the printed circuit. VEHICLE SPEED SENSOR lnspection 1. Remove the instrument cluster. 2. Connect an ohmmeter between terminals 2D and 2F. 3. Verify that the ohmmeter needle pulsates while rotating the speedometer cable shaft. ~ Pulsation: Ushaft rotation 4. If the correct number of pulsations fail to occur during each shaft rotation, replace the vehicle speed sensor. (Refer to page T-29.) WATER TEMPERATURE SENDER UNlT lnspection 1. Remove the sensor. 2. Place the sensor and a thermometer in water. 3. Heat the water gradually, and measure the resistance of the sensor with an ohmmeter. 4. If the resistance is not as specified, replace the sensor. Resistance: 190-260Q at 50°C (1 22°F) FUEL GAUGE SENDER UNlT (IN FUEL TANK) lnspection 1. Remove the fuel tank gauge sender unit. (Refer to section F.) 2. Disconnect the fuel gauge sender unit connector. 3. Check resistance between terminals A and B while slow- ly moving the unit arm from point F to point E. 4. If not correct, replace the fuel gauge sender unit. 2 Gartner Banana

INSTRUMENT CLUSTER T I OIL PRESSURE SENSOR 3. If not as specified, replace the oil pressure sensor. OIL PRESSURE SENSOR lnspection 1. Disconnect the oil pressure sensor connector. 2. Measure resistance between the oil pressure sensor and a body ground as shown. SPEEDOMETER CABLE lnspection 1. Disconnect the speedometer cable from the instrument cluster and transmission case. 2. Verify that the cable and gear spin easily when turned by hand. 3. If the cable or gear is stiff, replace as necessary. Condition Engine stopped Engine running Resistance 110-13052 13- 55R Gartner Banana

WARNING LIGHT AND SENDER UNIT T CIRCUIT DIAGRAM :-a m INSTRUMENT CLUSTER MLiN FUSS LICCd I n L IL/V~~J~,IB/M~W/BIG/LII R IL/V~Y/B[LG ( Y BILIB/Y~ 3 1 R I~/all r IG/R~R/w] B ~G/U~Y/G~G/B 1~ li IJ 91 n 10 w IE to 1~ 11 16 XL ar 11 b 30s a WXidZ.<, A, :-07 PLUlffi BRAKE SUlTCH 11) Gartner Banana

T WARNING LIGHT AND SENDER UNIT Remedy 1. Disconnect the timer and buzzer unit connector. 2. Turn the ignition switch ON, and verify that the seat belt warning light illuminates. I Warning light illuminates I Action Seat Belt Warning Light The seat belt warning light is controlled by the timer and buzzer unit. 1 Reolace timer and buzzer unit I Symptom: Seat belt warning light remains on six seconds after ignition switch is turned on. (Timer function does not operate.) I Yes Repair wiring harness (Instrument cluster - Timer and buzzer unit) I d 1 Symptom: Seat belt warning light does not illuminate when ignition switch is first turned on. I 45UOTX-070 Step 1 1. Ground terminal J of the timer and buzzer unit connector. 2. Turn the ignition switch ON, and verify that the seat belt warning light illuminates. 1 Warning light illuminates I Action I Step 2 1. Ground terminal D of the timer and buzzer unit connec- tor. 2. Turn the ianition switch ON. and verifv that the seat belt No Yes warning light illuminates. . Go to Step 2 Repair wiring harness (Timer and buzzer unit - GND) Warning light Illuminates Action Replace timer and buzzer unit Check bulb of seat belt warning light If bulb is OK, repair wiring harness (Instrument cluster - Timer and buzzer unit) Gartner Banana