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BOSCH LH-JETRONIC - Engine Control System
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BOSCH LH-JETRONIC - Engine Control System
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Description
Operation
Computer Controlled Ignition
Constant Idle Speed System
Electronic Control Unit
Air Control Valve
Throttle Switch
Coolant Temperature Sensor
A/C Switch
Trouble Shooting
Engine Does Not Start
Engine Hard To Start (Cold & Warm)
Poor Or No Idle
Excessive Fuel Consumption
Poor Performance (Low Top Speed)
Erratic Idle
Idle Speed Too High
Idle Speed Too Low (Engine Cold)
Jerking, Poor Acceleration
Diagnosis & Testing
Notes
Test No. 1 - Engine Starts But Will Not Run Properly
Test No. 2 - Testing System When Engine Will Not Start
Electronic Control Unit For The Constant Idle Speed System
Throttle Switch
A/C Switch
Coolant Temperature Sensor
Air Control Valve
Air Mass Meter
Check Air Mass Meter Current Supply And Ground
Air Mass Meter Resistance Check
Air Mass Meter Voltage Check
Check Air Mass Meter Measuring Wire Dirt Burn-Off
Adjustments
Throttle Switch