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Bosch L-jetronic Fuel Injection
Troubleshooting, Maintenance & Repair
Special thanks to John Allen for providing the content
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Introduction:
i - Table of Contents
ii - Table of Contents (continued)
iv - Introduction
v - Introduction (continued)
Diagnosis: Starter runs, engine will not start:
1 - Diagnostic process
2 - Air Intake System diagrams
3 - Diagnostic process (continued)
4 - Diagnostic process (continued)
5 - Diagnostic process (continued)
6 - Diagnostic process (continued)
7 - Diagnostic process (continued)
8 - Diagnostic process (continued)
9 - Diagnostic process (continued)
10 - Diagnostic process (continued)
11 - Diagnostic process (continued)
12 - Diagnostic process (continued)
Diagnosis: Starter runs, engine will not start when cold:
13 - Diagnostic process
14 - Diagnostic process (continued)
Diagnosis: Starter runs, engine will not start when hot:
15 - Diagnostic process
16 - Diagnostic process (continued)
Diagnosis: Engine starts then stops:
17/18 - Diagnostic process
Diagnosis: Engine idles too high:
19 - Diagnostic process
20 - Diagnostic process (continued)
21/22 - Diagnostic process (continued)
Diagnosis: Engine idles too low, or rough idle:
23/24 - Diagnostic process
Diagnosis: Hesitation:
25/26 - Diagnostic process
Diagnosis: Inadequate power & poor performance:
27 - Diagnostic process
28 - Diagnostic process (continued)
Diagnosis: Excessive fuel consumption:
29/30 - Diagnostic process
Diagnosis: CO value too high:
31 - Diagnostic process
Electrical diagrams:
32 - Electrical component location
33 - Ck coolant temperature sensor resistance
34 - Ck thermo time switch
35 - Ck air flow meter
36 - Ck air flow meter (continued)
37 - Ck air flow meter (continued)
38 - Ck voltage output to fuel pump @ relay set
39 - Ck voltage input to relay set from ignition switch
40 - Ck voltage input to fuel pump relay of relay set
41 - Ck input voltage to control relay of relay set
42 - Ck input voltage to control relay of relay set (continued)
43 - Ck output voltage from control relay of relay set
44 - Ck output voltage from control relay of relay set (continued)
45 - Ck output voltage from control relay of relay set (continued)
46 - Ck voltage signal from coil to control unit
47 - Ck ground circuit for control unit
48 - Ck ground circuit for control unit (continued)
49 - Ck ground circuit for control unit (continued)
50 - Ck air temperature sensor resistance
51 - Ck input to fuel pump relay of relay set
52 - Ck voltage @ auxiliary air regulator
53/54 - Ck full throttle contacts of throttle plate switch
FI Maintenance: 1500cc engine:
55 - Maintenance process
56 - Maintenance process (continued)
57 - Maintenance process (continued)
58 - Maintenance process (continued)
59 - Maintenance process (continued)
60 - Maintenance process (continued)
61 - Maintenance process (continued)
62 - Maintenance process (continued)
63 - Maintenance process (continued)
64 - Maintenance process (continued)
FI Maintenance: 2000cc engine:
65 - Maintenance process
66 - Maintenance process (continued)
67 - Maintenance process (continued)
68 - Maintenance process (continued)
69 - Maintenance process (continued)
70 - Maintenance process (continued)
71 - Maintenance process (continued)
72 - Maintenance process (continued)
Appendix: FI electrical system:
73/74 - Electrical system diagram
75 - Test specs
76 - Test specs (continued)
