TESTING
| WARNING | Vehicle is equipped with an air bag system. To prevent air bag deployment, disconnect negative battery cable and wait at least 2 minutes before servicing instrument cluster. See AIR BAG RESTRAINT SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT section. |
COOLANT TEMPERATURE SENDING UNIT TEST
Remove sending unit from intake manifold. Dip sensor end of sending unit into 158°F (70°C) water. Using ohmmeter, check sending unit resistance between terminal and case. Resistance should be 90.5-117.5 ohms. If resistance is not within specifications, replace sending unit. Apply thread sealant to sending unit before installing.
DIMMER RHEOSTAT TEST
Remove dimmer rheostat. See INSTRUMENT CLUSTER TRIM PANEL SWITCHES under REMOVAL & INSTALLATION. Connect dimmer rheostat to battery with 40-watt test light. (Scheme 1) Turn rheostat knob to full right and full left positions. Brightness of bulb should change without flashing or flickering. If brightness does not change or does not change smoothly, replace dimmer rheostat.
Scheme 1
RELAY TEST
- Remove relay from engine compartment relay box. (Scheme 2) Using ohmmeter, check for continuity between relay terminals No. 1 and 3. Continuity should exist. Check for continuity between terminals No. 4 and 5. Continuity should not exist.
- Apply battery voltage to relay terminal No. 1, and ground terminal No. 3. Check continuity between relay terminals No. 4 and 5. Continuity should exist. If relay does not test as specified, replace relay.
Scheme 2
FOGLIGHT SWITCH TEST
Remove foglight switch. Using ohmmeter, check switch circuit continuity with switch in indicated positions. (Scheme 3) If continuity is not as specified, replace foglight switch.
Scheme 3
Resistance Test
Using ohmmeter, measure resistance between fuel gauge terminal and ground terminal with float at points "F" and "E". (Scheme 4)and (Scheme 5). See FUEL SENDING UNIT RESISTANCE table. Ensure resistance changes smoothly when float arm is moved slowly between points "F" and "E". Replace sending unit if readings are not as specified.
| Measure Point | Ohms | ||
|---|---|---|---|
| AWD | |||
| Main Gauge | |||
| "F" | 1-3 | ||
| "E" | 55.9-57.9 | ||
| Sub Gauge | |||
| "F" | 1-3 | ||
| "E" | 49.1-51.1 | ||
| FWD | |||
| "F" | 2-6 | ||
| "E" | 105-119 | ||
FUEL SENDING UNIT RESISTANCE
Scheme 4
Scheme 5
THERMISTOR TEST
- Using 12-volt test light with a 3.4-watt bulb, connect positive battery terminal to fuel gauge sending unit connector. (Scheme 6) Use jumper wire to ground fuel gauge sending unit connector to battery.
- Submerge thermistor in container of water. If test light does not come on, thermistor is okay. If test light comes on, replace thermistor.
| CAUTION | After completing thermistor test, wipe or blow sending unit dry before installing into fuel tank. |
Scheme 6
HAZARD WARNING SWITCH TEST
Remove hazard switch. See INSTRUMENT CLUSTER TRIM PANEL SWITCHES under REMOVAL & INSTALLATION. Using ohmmeter, check switch circuit continuity at specified connector terminals with switch in indicated positions. See HAZARD WARNING SWITCH RESISTANCE table. (Scheme 7) If continuity is not as specified, replace hazard switch.
| Switch Position | (1) ContinuityBetween Terminals No. |
|---|---|
| OFF | 5 & 7 |
| ON | 1, 2 & 4; 5 & 6 |
| (1) With switch in either position, continuity should exist at terminals No. 9 and 10 for switch illumination. | |
| (1) | With switch in either position, continuity should exist at terminals No. 9 and 10 for switch illumination. |
HAZARD WARNING SWITCH RESISTANCE
Scheme 7
REAR DEFOGGER SWITCH TEST
For testing information on rear defogger switch, see DEFOGGER - REAR WINDOW article in the ACCESSORIES/SAFETY EQUIPMENT section.
SPEEDOMETER TEST
| WARNING | On vehicles equipped with All Wheel Drive (AWD), rear wheels must be properly raised and supported to prevent vehicle movement during testing. |
| CAUTION | DO NOT operate clutch suddenly or vary speed rapidly during testing. |
Ensure tire pressure is correct. Position front wheels of vehicle on speedometer tester drum. Chock rear wheels. On FWD models, apply parking brake. On all models, attach a chain to rear tie-down holes located in rear of wheelwell. Ensure speedometer ranges are within specification. See SPEEDOMETER SPECIFICATIONS table. If ranges are not as specified, replace speedometer.
| Standard Values | Allowable Range | |
|---|---|---|
| MPH | ||
| 20 | 19-22 | |
| 40 | 38-44 | |
| 60 | 57-66 | |
| 80 | 76-88 | |
| 100 | 94-110 | |
| KM/H | ||
| 40 | 37-44 | |
| 80 | 75-88 | |
| 120 | 113-132 | |
| 160 | 150-176 | |
SPEEDOMETER SPECIFICATIONS
TACHOMETER TEST
Connect inductive-type engine tachometer to high tension cable. Start engine and compare tachometers at specified engine speed. See TACHOMETER SPECIFICATIONS table. Replace tachometer if difference is excessive.
| Engine RPM | Allowable Specification |
|---|---|
| 8000 | R/Min. Display Tachometer |
| 1000 | 900-1100 |
| 3000 | 2850-3150 |
| 5000 | 4750-5250 |
| 6000 | 5700-6300 |
| 9000 | R/Min. Display Tachometer |
| 700 | 630-770 |
| 3000 | 2890-3220 |
| 5000 | 4900-5300 |
| 7000 | 6950-7350 |
TACHOMETER SPECIFICATIONS
WIPER/WASHER SWITCH TEST
For testing information on wiper/washer switch, see WIPER/WASHER SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT section.