Trouble Code E.7.1
Cruise control brake circuit sends 12 volt signal to ECM, except when brake is depressed. When brake is depressed, switch is opened and brake signal drops to 0 volts.
NOTE:
The following step numbers refer to the numbers in the accompanying flow chart(s).
- Code indicates that brake signal does not switch from 12 volts to 0 volts when brake is applied. With ignition on, back probe cruise control brake switch connector circuit Nos. 350 and 86 with test light connected to ground on each circuit. If test light lights on only 1 side of switch, then cruise control/VCC brake switch does not have continuity and should be replaced if it is properly adjusted.
- If there is light on both sides of cruise control/VCC brake switch, then switch has continuity. With ignition on, depress brake pedal and back probe cruise control/VCC brake switch circuit No. 86 with test light to ground. If test light continues to glow, replace cruise control/VCC brake switch because it is shorted.
- If test light does not glow, then switch is functioning properly. Check circuit No. 86 for open. If circuit No. 86 is okay, check for faulty ECM connector or faulty ECM because it is not processing good brake release signal.
- Check 3 amp cruise fuse. If fuse is okay, then repair open in circuit No. 350.
- If cruise control fuse is not okay, there is a short circuit to ground in wiring harness or ECM. Check circuit Nos. 350 and 86 for short to ground. Engaging cruise control "SET/RESUME" switch, or "RESUME/ACCEL" switch can blow cruise fuse. This situation would occur if circuit Nos. 397, 87, or 86 have short to ground on them. If wiring harness is okay and fuse blows again, check for faulty ECM connector or faulty ECM because it is internally shorted.