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OBD system introduction
Vehicle diagnostics system, referred to as OBD(On-Board Diagnostic). When the system fails, the fault light (MIL) or
the engine (Check Engine) warning light is lit, The OBD system will save the fault information into the memory and
read the related information in the form of a fault code through the standard diagnostic instrument and the diagnostic
interface. According to the indication of the fault code, the maintenance personnel can quickly and accurately determine
the nature and location of the fault.
1. Fault information record
The ECU continuously monitors sensors, actuators, related circuits, fault indicator lights and battery voltage, and even
the ECU itself, and to the sensor output signal, actuator drive signal and internal signal (such as lambda closed loop
control, cylinder temperature / coolant temperature, idle speed control and battery) Reliability detection is carried out by
voltage control, etc.
Once a fault occurs in a link, or a signal is not trusted, the ECU immediately sets up a fault information record in the
RAM's fault memory. The fault information record is stored in the form of a fault code. The fault code is called current
Summary of Contents for GP125i
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Page 20: ...19 5 Oil seal punch Z07 1 Z07 9 6 Flywheel extractor Z04 7 Spark plug sleeve Z05 ...
Page 22: ...21 2 Tool case 1 3 Tool case 2 4 Spring pliers ...
Page 23: ...22 5 Screwdriver 6 Pliers 7 Nylon hammer 8 Multimeter ...
Page 29: ...28 2 Remove the spark plug suppressor cap shown no 3 ...
Page 51: ...50 ELECTRICAL SYSTEM Components arrangement ...
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Page 54: ...53 Instrument Panel Indications 1 Engine RPM Indicator 2 Fuel gauge ...
Page 56: ...55 Harness diagram ...
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Page 58: ...57 Conceptual diagram ...
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Page 69: ...68 4 Remove the screw shown no 9 two bolts shown no 8 and remove the air filter ...
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Page 115: ...114 2 Tap left crankshaft with nylon hammer remove crankshaft ...
Page 118: ...117 EFI SYSTEM The vehicle uses the DELPHI MT05 EFI system The schematic diagram as follows ...
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