Operation Section
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8. DIAGNOSIS
8.1 Outline Of The Diagnostic Function
z The diagnostic function enables a system to self-diagnose its own malfunctions. If abnormal conditions occur in the sen-
sors or actuators used in the control systems, the respective systems convert the malfunction signals into codes and
transmit them to the engine ECU. The engine ECU records the transmitted malfunction code into memory. Recorded
codes are output at the diagnostics connector on the vehicle. To inform the driver of the malfunction, the engine ECU
causes the MIL (Malfunction Indicator Light) in the meter to illuminate. Accurate troubleshooting can be performed by
way of the DTCs (Diagnostic Trouble Codes) that are output at the diagnostic connector. For details on actual diagnosis
codes, see the vehicle manual. It is necessary to put the vehicle into the state below before starting inspection.
(1) Pre-Inspection Preparation
• Position the shift lever in "N" or "P".
• Turn OFF the air conditioner.
• Verify that the throttle valve is fully closed.
8.2 Diagnosis Inspection Using DST-1
z The DST-1 can be used in both normal and check modes. Compared to the normal mode, the check mode has a higher
sensitivity to detect malfunctions.
z The check mode inspection is performed when normal codes are output in the normal mode, despite the fact that there
may be malfunctions in the sensor signal systems.
(1) Reading DTCs
1) DST-1 Connection: Connect the DST-1 to the DLC3 termi-
nal.
2) Reading DTCs: Operate in accordance with the instructions
shown on the screen to display the "DTC check" screen. Se-
lect either the normal or check mode and read the DTC.
< NOTE >
If no DTC appears on the screen, there may be a failure
in the engine ECU.
16 15 14 13 12 11 10 9
87654321
DLC3
Q000914
Diagnostic Trouble Codes (DTC)
1. · · ·
Execute: Execute
Q000915E
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