TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
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BE/Body Electrical Systems, page 202

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p.203
Body Electrical Systems — MK4 Supra Body Electrical Systems, page 202
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Page text (OCR transcript)
BE–202

BODY ELECTRICAL SYSTEM – SERVICE SPECIFICATIONS

TACHOMETER (ON–VEHICLE)
Standard indication (rpm)                                    Allowable range (rpm)
700                                                          630 – 770
1000                                                         915 – 1115
2000                                                         1920 – 2220
3000                                                         2890 – 3350
4000                                                         3940 – 4400
5000                                                         5025 – 5425
6500                                                         6650 – 6950
7000                                                         7025 – 7625

OD/TRIP METER (CONNECTOR CONNECTED)
1 – Ground (Ignition SW position ON)                         Battery positive voltage
4 – Ground (Light Control SW position TAIL or HEAD)          Battery positive voltage
5 – 7 (Ignition SW ON and drive the vehicle slowly)          0V ↔ Battery positive voltage
6 – 7 (Ignition SW ON and drive the vehicle slowly)          0V ↔ more than 5V
8 – Ground (Constant)                                        Battery positive voltage
10 – Ground (Ignition SW ON, Light Control SW TAIL or
        HEAD and turn the Light Control Rheostat
        knob to clockwise)                                   6V → 0V

FUEL RECEIVER GAUGE
A – B                                                        Approx. 269.7 Ω
A – C                                                        Approx. 123.5 Ω
B – C                                                        Approx. 146.2 Ω

FUEL SENDER GAUGE
Float position: F                                            Approx. 4.0 Ω
Float position: 1/2                                          Approx. 55.0 Ω
Float position: E                                            Approx. 107.0 Ω

ENGINE COOLANT TEMPERATURE RECEIVER GAUGE
A – B                                                        Approx. 229.7 Ω
A – C                                                        Approx. 54.0 Ω
B – C                                                        Approx. 175.7 Ω

ENGINE COOLANT TEMPERATURE SENDER GAUGE
50 °C (122.0 °F)                                             160 – 240 Ω
120 °C (248.0 °F)                                            17.1 – 21.2 Ω

LIGHT FAILURE SENSOR
3 – Ground (Light Control SW position OFF)                   No voltage
3 – Ground (Light Control SW position TAIL or HEAD)          Battery positive voltage
4 – Ground (Ignition SW position LOCK or ACC)                No voltage
4 – Ground (Ignition SW position ON)                         Battery positive voltage
7 – Ground (Stop Light SW position OFF)                      No voltage
7 – Ground (Stop Light SW position ON)                       Battery positive voltage
8 – Ground (Engine stop)                                     No voltage
8 – Ground (Engine running)                                  Battery positive voltage

INTEGRATION RELAY (Seat Belt Warning)
1 – Ground (Constant)                                        Battery positive voltage
9 – Ground (Ignition SW LOCK or ACC)                         No voltage
9 – Ground (Ignition SW ON)                                  Battery positive voltage