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1. Diagnosis Codes
• Diagnosis codes indicate the faulty sections of the vehicle.
• A fault can be repaired by reading out the diagnosis code(s) stored in the control unit and performing the remedy
for that code(s).
• Diagnosis codes can be displayed in the following two methods. Select either of them according to the system to
be diagnosed.
• Using a Multi-Use Tester
• Using flashing of a warning lamp on meter cluster
• The table below indicates the systems for which diagnosis codes can be displayed and the methods usable for in-
dividual systems.
1.1 Systems and diagnosis code displaying methods
1.2 Types of diagnosis codes
• There are two types of diagnosis code output method depending on the system: one has a distinction of present
and past codes, and the other does not have such a distinction.
(1) The system that has a distinction of present and past diagnosis codes
(1.1) Present diagnosis code
• Fault developed in the vehicle after the starter switch is set to ON is indicated by corresponding diagnosis code.
• The fault warning lamp is lit at the same time.
(1.2) Past diagnosis code
• Past fault developed in the vehicle is indicated by corresponding diagnosis code stored in the memory of the elec-
tronic control unit.
• With the vehicle restored to its normal condition or the starter switch turned from OFF to ON after inspection or re-
pair against present diagnosis codes, the present diagnosis code is stored as past diagnosis codes in the memory
of the electronic control unit.
• When reading out the past diagnosis codes, the warning lamp does not illuminate as such codes do not indicate
the current fault.
(2) The system that does not have a distinction of present and past diagnosis codes
• The present and past diagnosis codes are displayed together without distinction.
Warning
lamp
System
Diagnosis codes
displaying methods
Reference
Gr
Multi-Use
Tester
Flashing of
warning lamp
Common rail
OO
13
Turbocharger 15
Exhaust gas recirculation 17
Starter continuous energizing preventing function 54
Vehicle speed limiting (SLD)
OO54
Auto cruise
– Full auto air conditioner O O 55
System
Diagnosis code
With distinction of present and past Without distinction
Except below O –
Full auto air conditioner – O
DIAGNOSIS CODES
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