The brake switch has 2 contacts. One allows the stop lights to be supplied and the other is used for fault find and the correlation between the accelerator pedal position and the brake pedal position. Also, the brake switch has the cancellation of cruise control. The ECM senses the state of brake operating through brake switch. The redundant brake circuit is actuated when the accel pedal is depressed and the brake pedal depressed. The ECM will apply a LIMP HOME MODE limiting the signal from the accelerator and controlling the injector operation allowing the engine to 1200 rpm only when the brake is released, APS signal is returned and injector operation re-instated.
If the brake circuit is open circuit or the brake signal 1,2 is abnormal correlatively during two driving cycles, this code will be set.
DTC NO.
Detecting Condition
Possible Cause
P 0703
? P 0703
? Error is recognized if the brake switch 1 signal and the brake switch 2 signal are abnormal after the ignition switch on (connector pulled off) correlatively the brake switch 2 signal are abnormal correlatively during the driving (open circuit, poor connection)
? Error is recognized if the brake switch 1 signal and the brake switch 2 signal are abnormal correlatively during the driving (open circuit, poor connection)
? Engine Condition : IG ON
? Fuel Limit : NO
? Fuel Cut : NO
? EGR OFF : NO
? MIL : NO
? LIMP HOME MODE
Cruise control system deactivited
? Open or short in circuit
? Fuse
? Brake s/w
? ECM