Clark BR120 Brake Systems Index:

About This Class ……………………………………………………………………………. 3
About Safety ………………………………………………………………………………….. 4
About Carbon Monoxide ………………………………………………………………….. 5
Definition of Terms ………………………………………………………………………… 6
Section 1. Fuel Injector System Operation ……………………………………….. 7
Gasoline System Operation …………………………………………………… 7
Component Location …………………………………………………………….. 10
Fuel Injectors ……………………………………………………………………….. 11
Filters ………………………………………………………………………………….. 12
Pumps …………………………………………………………………………………. 12
Gasoline Regulators ……………………………………………………………… 12
LPG System Operation …………………………………………………………. 13
LPG Regulators ……………………………………………………………………. 13
LPG Fuel Tank …………………………………………………………………….. 14
LPG Service Valve ………………………………………………………………… 14
10% Withdrawal Valve ………………………………………………………….. 14
Vent Valve …………………………………………………………………………… 15
Tank Fuel Gauge ………………………………………………………………….. 15
Quick Disconnect Couplings ………………………………………………….. 15
Governor Operation ………………………………………………………………. 16
Failsafe Modes ……………………………………………………………………… 17
Cold Start ……………………………………………………………………………. 17
Section 2. Maintenance and Troubleshooting Procedures ………………….. 18
Fuel Filters ………………………………………………………………………….. 18
Injector Flush ………………………………………………………………………. 18
Cleaning Throttle Fly ……………………………………………………………. 18
Checking Exhaust Emissions ………………………………………………… 18
Correcting Out of Range Air/Fuel Mixtures ……………………………. 19
Ignition Timing Procedure ……………………………………………………. 20
Setting the Machanical Idle ………………………………………………….. 21
Idle Self Learn Procedure ……………………………………………………… 22
Special Tools ……………………………………………………………………….. 23
Fuel Pressure Adjustments …………………………………………………… 24
System Specifications ……………………………………………………………. 26
Sensor Resistance Specifications ……………………………………………. 27
Pedal Position Sensor Check …………………………………………………. 28
Checking For Leaking Injectors …………………………………………….. 29
Troubleshooting Flow Charts ………………………………………………… 30
Schematics …………………………………………………………………………… 45
Section 3. Hybrid Micoprocessor Spark Timing System …………………….. 50
Computors and Voltage Signals …………………………………………….. 50
Sensors ………………………………………………………………………………… 51
Switch Types ………………………………………………………………………… 52

Engine Control Module (ECM) ………………………………………………. 53
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IC 201 page 2
Engine Coolant Temperatre Sensor (ECT) ……………………………… 54
Manifold Absolute Pressure Sensor (MAP) ……………………………… 55
ECM Self Diagnostics ……………………………………………………………. 55
Service Mode ………………………………………………………………………… 55
How Trouble Codes Are Set ……………………………………………………. 56
Service Precautions ……………………………………………………………….. 57
Replacing Components …………………………………………………………… 58
Troubleshooting the H-MSTS System ……………………………………… 62
Trouble Code Chart ……………………………………………………………….. 62
Clearing Trouble Codes ………………………………………………………….. 63