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6-152 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC DETECTING CONDITION AND TROUBLE AREA (DTC P0506/P0507)
DTC P0506:
Engine idle speed is 100 r/min. or more lower than target idle speed for
20 sec. continuously when vehicle stops and closed throttle position
(ON).
DTC P0507:
Engine idle speed is 200 r/min. or more higher than target idle speed for
20 sec. continuously when vehicle stops and closed throttle position
(ON).
(2 driving cycle detection logic)
DTC CONFIRMATION PROCEDURE
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION
PROCEDURE.
• Intake air temperature: –7°C (19.4°F) or higher
• Engine coolant temperature: –7°C (19.4°F) or higher
• Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
• Transmission gear shift lever is shifted in "Neutral" for M/T
• Electric load (lighting, heater blower, rear defogger, etc.) and A/C are turned OFF.
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature (80°C – 110°C, 176°F – 230°F).
4) Run engine at idle speed (600 – 1000 r/min.) for 1 min. or more.
5) Check DTC and pending DTC.
TROUBLESHOOTING
Step
1
Was "Engine and Emission Control System
Check" performed?
2
DTC Check
Is DTC P0505 displayed?
3
Idle Speed Check
1) Check idle speed/idle air control duty refer-
ring to "Idle speed/idle air control (IAC) duty
inspection" in Section 6E1.
Is check result as specified?
4
Vehicle Speed Sensor Signal Check
Is vehicle speed displayed on scan tool when
driving vehicle?
DTC DETECTING CONDITION
Action
• Idle air control valve or its circuit
• Air intake system (clog or leak-
age)
• Engine mechanical
• Accessory engine load
• ECM
• Vehicle speed sensor
Yes
Go to Step 2.
Go to "DTC P0505 Idle Air
Control System" in this
section.
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection" in
Section 0A.
If OK, substitute a known-
good ECM and recheck.
TROUBLE AREA
No
Go to "Engine and Emis-
sion Control System
Check" in this section.
Go to Step 3.
Go to Step 5.
Go to "DTC P0500 Vehi-
cle Speed Sensor (VSS)
Malfunction" in this sec-
tion.
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