TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
p.169
BE/Body Electrical Systems170 / 203
p.171
MATRIX CHART OF PROBLEM SYMPTOMS — MK4 Supra Body Electrical Systems, page 170
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BE–170 BODY ELECTRICAL SYSTEM – CRUISE CONTROL SYSTEM MATRIX CHART OF PROBLEM SYMPTOMS The table below will be useful for you in troubleshooting these electrical problems. The most likely causes of the malfunction are shown in the order of their probability. Inspect each part in the order shown, and replace the part when it is found to be faulty. See page IN-35 BE-171 BE-197 BE-179 BE-182 BE-191 BE-189 BE-177 BE-184 IN-30 BE-165 Inspection Item Cruise Control ECU Actuator Main Switch (in Control Switch) Control Switch Stop Light Switch Clutch Switch or Park/Neutral Position Switch Parking Brake Switch Vehicle Speed Sensor Speed Control Cable Function Throttle Position Sensor (IDL) Wire Harness Indicator Light Diagnosis Trouble Code Problem Type A Type B • "CRUISE" Indicator light blinks. • Cruise control system does not set. • Cruse control system does not operate. 11 3 2 1 12 4 2 3 1 13 3 2 1 14 – 3 2 1 21 – 3 2 1 23 – 4 2 3 1 32 3 2 1 34 3 2 1 41 1 1 42 – Source voltage drop Indicator light does not light up 3 1 2 Large speed drop when the cruise control switch turned to SET. 4 3 1 2 Vehicle speed fluctuates when cruise control switch turned to SET. 4 3 1 2 Set speed deviates on high or low side. 4 3 1 2 Acceleration response is sluggish when cruise control switch turned to "ACCEL" or "RESUME" 5 4 3 2 1 Cruise control system does not set. Cruise control system does not operate. 4 OK 9 8 2 3 4 5 6 7 1 NG 2 1 Set speed does not cancel when brake pedal depressed. 3 OK 1 NG 2 1 Set speed does not cancel when parking brake lever pulled. 3 OK 1 NG 2 1 Cruise control not cancelled, even when transmission is shifted to EXCEPT D RANGE. 3 OK 1 NG 2 1 Set speed does not cancel when clutch pedal depressed. 3 OK 1 NG 2 1 Set speed does not cancel when cruise control switch turned to CANCEL. 3 OK 1 NG 2 1 Vehicles speed does not decrease when cruise control switch turned to COAST. 1 OK 4 1 3 2 NG 2 1 Vehicle speed does not accelerate when cruise control switch turned to ACCEL. 2 OK 4 1 3 2 NG 2 1 Vehicle speed does not return to memorized cruise when control switch turned to RESUME. 2 OK 4 1 3 2 NG 2 1 Speed can be set below about 40 km/h (25 mph.) 4 OK 1 NG 2 1 Cruise control does not disengage even at about 40 km/h (25 mph) or less. 4 OK 2 1 NG 2 1