Service manual

3-38 FUEL SYSTEM (DFI)
Self-Diagnosis
How to Read Service Codes
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Service codes are shown by a series of long and short flicks of the tester as shown below.
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Read 10th digit and unit digit as the tester flicks.
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When there are a number of problems, all the service codes can be stored and the display will
begin starting from the lowest number service code in the numerical order. Then after completing
all codes, the display is repeated until the self-diagnosis indicator terminal is open.
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If there is no problem, no code and unlight.
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For example, if two problems occurred in the order of 21, 12, the service codes are displayed from
the lowest number in the order listed.
(12 → 21) → (12 → 21) → ···(repeated)
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If the problem is with the following parts, the ECU cannot memorize these problems, the tester
doesn’t flick, and no service codes can be displayed.
FI Indicator Light (LCD)
Fuel Pump
ECU Main Relay
ECU Power Source Wiring and Ground Wiring (see ECU Inspection)
Fuel Injectors
ISC Valve
How to Erase Service Codes
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Even if the ignition switch is turned OFF, the battery or the ECU are disconnected or the problem is
solved, all service codes remain in the ECU.