Section C - Electrics Hydraulic Systems Control Controls Enable (Lever Lock ISO)
Controls Enable (Lever Lock ISO) Overview The ISO standard 13998 requires a lever lock circuit which consists of: – Two Lever Lock Switches located below the lever lock lever – A Control Enable switch – A Control Enable solenoid
If the operator presses the controls enable switch again the MECU responds by switching off the output to the controls enable solenoid at connector J2 pin 6. The controls enable solenoid de-energises and the hydraulic controls isolate. The system has Error codes which can be generated to display a fault in the system: – C1316: Pilot pressure is above 20 bar with the lever lock up. The solenoid may be stuck open.
– A Hydraulic Pilot Pressure Sensor
Wires and Connectors
– C1317: Pilot pressure is below 20 bar with the lever lock down. The solenoid may be stuck closed or the pilot pressure is low.
K Fig 171. ( T C-267)
– C1318: Control Enable solenoid is stuck.
K 8 Station Solenoid Valve ( T C-258)
– C131A: Only 1 Lever Lock Switch is signalling that the lever lock is down.
– Controls enable solenoid (C051).
C122
K Pressure Switches ( T C-259) – Hydraulic Pilot Pressure Sensor (C090) When the lever lock is in the up position the lever lock switches (C063 and C225) change state and the controls enable solenoid (C051) de-energises. At the same time the input at MECU connector J2 pin 34 connects to earth. The MECU responds by switching off the output to the controls enable solenoid at connector J2 pin 6. When the lever lock is in the lowered position the lever switches change state and the earth connection at MECU is switched off. Lever Lock Switch 1 (C063) connects the controls enable solenoid to earth. The MECU output at connector J2 pin 14 remains off and the controls enable solenoid does not energise. The lever lock switch 2 (C225) sends a signal to the DECU.
C063, C225 C090
C129480-C17.eps
Fig 170. Harness connectors C063, C225, C090 and C122
When the operator presses the controls enable switch (C122) there is a momentary earth connection at the MECU connector J2 pin 25. The MECU responds by switching on the output to the controls enable solenoid at connector J2 pin 6. The controls enable solenoid energises and the hydraulic controls are active. The pilot pressure sensor (C090) measures the pilot pressure at the cab manifold to verify that the control enable solenoid is working correctly.
C-266
9813/4100-1
C-266