SEQUENCE OF OPERATION
1. Power available at Main Relay – CKTS 810 & 909
2. Key Switch ON
a. CN6E-26 turns ON and provides power to Safety Relay
b. Power provided to SPLICE 7
i. CN6E-2 CKT 805D powers up
ii. ECU CNTRL Relay – CKT 914 via 5A fuse CN4-A10/B10
iii. WAIT TO START signal – CN6E-7/CKT 907A
iv. START Relay – CN4-D4 /CKT-805B
3. Upper Control System “Wake Up”
a. CN6E-16 to GND (CKT 908)
b. ECU Relay Energizes;
i. Power to NEUTRAL Relay POS of Coil – CKT 914C
ii. Power to ECU – CKT 914B
1. ECU “ON” and sends GROUND to Main Relay – CN4-F6/CKT 922
2. ECU & Accessory Power Up
a. ECU Full Power Up – CKT 906A & SPLICE 1
i. CKT 926 – 10A fuse CN4-C10/D10 – NOx/DEF Sensors
ii. CKT 926A Power Up – Alternator Ignition
iii. CKT 926B – ECU Main Power
iv. CKT 916 – WIF Sensor & Fuel Pump
4. Machine in Neutral
a. CN6E-11 GROUND at CN4-F2 causes NEUTRAL Relay to Energize
b. Upper Level Control System broadcasts NEUTRAL and PARK Message over CAN.
5. Key Switch to Start
a. Start Signal from KEY-50 passes through 5A Fuse CN4-C9/D9
b. Signal passes through NEUTRAL Relay CN4-D2/F1 via CKT 905B to SPLICE 13
i. CKT 905D sends start input to ECU via CN17-11
ii. CKT 909A energizes START relay at CN4-D3
iii. ECU controls Starter Relay NEG of Coil to prevent starter overrun.
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