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System Description NHEL0190 Refer to Owner’s Manual for ASCD operating instructions. POWER SUPPLY AND GROUND NHEL0190S01 When ignition switch is in the ON or START position, power is supplied: I through 10A fuse [No. 30, located in the fuse block (J/B)] I to ASCD brake switch terminal 1 and I to combination meter terminals 50 and 66, I through 15A fuse [No. 20, located in the fuse block (J/B)] I to park/neutral position relay terminal 1, I through 10A fuse [No. 10, located in the fuse block (J/B)] I to ASCD control unit terminal 5, and Power is supplied at all times: I through 15A fuse [No. 2, located in the fuse block (J/B)] I to the stop lamp switch terminal 1, and When park/neutral position is in the P or N position, ground is supplied: I to park/neutral position relay terminal 2 I through park/neutral position switch and body grounds F41 and F39. When ASCD main switch is depressed (ON), ground is supplied: I to ASCD control unit terminal 11 I from ASCD steering switch terminal 1 I to ASCD steering switch terminal 2 I from ASCD control unit terminal 24. then ASCD control unit holds CRUISE condition and illuminates CRUISE indicator. I to combination meter terminal 46 I from ASCD control unit terminal 15. OPERATION NHEL0190S02 Set Operation NHEL0190S0201 To activate the ASCD, all of following conditions must exist. I Ground supply to ASCD control unit terminal 11 I Power supply to ASCD control unit terminal 8 [Brake pedal is released and A/T selector lever is in other I Vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH). (Signal from combination meter) When the SET/COAST switch is depressed, power is supplied: I from ASCD steering switch terminal 2 I to ASCD control unit terminal 24. And then ASCD pump is activated to control throttle wire and ASCD control unit supply ground I to combination meter terminals 51 to illuminate SET indicator. A/T Overdrive Control during Cruise Control Driving NHEL0190S0202 When the vehicle speed is approximately 8 km/h (5 MPH) below set speed, a signal is sent I from ASCD control unit terminal 10 I to TCM (transmission control module) terminal 24. When this occurs, the TCM (transmission control module) cancels overdrive. ASCD Shifting Control NHEL0190S0207 During ASCD cruise, ASCD control unit controls A/T shifting to avoid uncomfortable shifting. I Throttle position sensor from ECM I A/T shift solenoid valve A GI MA EM LC EC FE AT AX SU BR ST RS BT HA SC IDX AUTOMATIC SPEED CONTROL DEVICE (ASCD) System Description EL-277 |