Page 41
Fig. 44). And since the test is performed
using the original injectors it is possible to
ascertain at the same time whether any
scatter in the figures results from the fuel
distributor itself or from the injectors.
The tester’s small measuring tubes serve
for idle measurement and its larger
measuring tubes for part-load or fullload measurement.
Connection to the fuel distributor is by
means of eight hoses. The injectors are
pulled out of their mountings on the
engine and inserted in the automatic
couplings at the ends of the hoses. Each
automatic coupling incorporates a pushup valve which prevents fuel escaping on
hoses which are not connected (e.g. on
6-cylinder systems. Fig. 44). A further
hose returns the fuel to the tank.
Pressure-measuring device
This is used to measure all the pressures
which are important for correct K-Jetronic
operation:
– Primary (system) pressure: Provides
information on the performance of the
fuel-supply pump, on fuel-filter flow
resistance, and on the condition of the
primary-pressure regulator.
– Control pressure: Important for assessment of all operating conditions
(for instance: Cold/warm engine; part
load/full load; fuel-enrichment functions, occasionally pressure at high
altitudes).
– Leakage integrity of the complete
system. This is particularly important
with regard to the cold-start and hotstart behavior. Automatic couplings in
the hoses prevent the escape of fuel.
K-Jetronic
Workshop
testing
techniques
Lambda closed-loop-control tester
On K-Jetronic systems with Lambda
closed-loop control, this tester serves to
check the duty factor of the Lambda-sensor signal (using simulation of the “rich”/
“lean” signal), and the “open-loop/closedloop control function”. Special adapter
lines are available for connection to the
Lambda-sensor cable of the various vehicle models. Measured values are shown
on an analog display.
Fig. 44
Injected-quantity comparison tester (connected to a 6-cylinder installation)
1 Fuel-distributor injection lines,
2 Injectors,
3 Automatic couplings,
4 Comparison-tester hoses,
5 Small measuring tube,
6 Large measuring tube,
7 Return line to fuel tank.
5
6
1 2 34 5 6 7 8
2
3
4
7
UMK 1493Y
1
39
Page 42
The Program
Order Number
Gasoline-engine management
Emission Control (for Gasoline Engines)
Gasoline Fuel-Injection System K-Jetronic
Gasoline Fuel-Injection System KE-Jetronic
Gasoline Fuel-Injection System L-Jetronic
Gasoline Fuel-Injection System Mono-Jetronic
Ignition
Spark Plugs
M-Motronic Engine Management
ME-Motronic Engine Management
Diesel-engine management
Diesel Fuel-Injection: An Overview
Diesel Accumulator Fuel-Injection System
Common Rail CR
Diesel Fuel-Injection Systems
Unit Injector System / Unit Pump System
Radial-Piston Distributor Fuel-Injection
Pumps Type VR
Diesel Distributor Fuel-Injection Pumps VE
Diesel In-Line Fuel-Injection Pumps PE
Governors for Diesel In-Line Fuel-Injection Pumps
Automotive electrics/Automotive electronics
Alternators
Batteries
Starting Systems
Electrical Symbols and Circuit Diagrams
Lighting Technology
Safety, Comfort and Convenience Systems
Driving and road-safety systems
Compressed-Air Systems for Commercial
Vehicles (1): Systems and Schematic Diagrams
Compressed-Air Systems for Commercial
Vehicles (2): Equipment
Brake Systems for Passenger Cars
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