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DTC P0507: Idle
Control Sytem RPM Higher Than Expected
TECHNICAL DESCRIPTION
- The amount of air taken in during idling is regulated
by the opening and closing of the throttle valve.
- The ECM checks the difference between the actual engine speed and the target engine
speed.
DESCRIPTIONS OF MONITOR METHODS
Difference between actual and target idle speed is over
the specified value.
MONITOR EXECUTION
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory
for the item monitored below)
- Misfire monitor
- Exhaust gas recirculation (EGR) system monitor
- Fuel system monitor
- Vehicle speed sensor monitor <M/T>
Sensor (The sensor below is determined to be normal)
- Mass airflow sensor
- Engine coolant temperature sensor
- Intake air temperature sensor
- Barometric pressure sensor
- Throttle position sensor
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
- Under the closed loop idle speed control.
- Engine coolant temperature is higher than 41°C (105°F).
- Battery positive voltage is higher than 10 volts.
- Barometric pressure is higher than 76 kPa (22.4 in.Hg).
- Intake air temperature is higher than -10°C (14°F).
- 3 seconds have elapsed from the start of the previous monitoring.
- Target airflow rate is 0 L/sec.
Judgement Criterion
- Actual idle speed has continued to be higher than the target idle speed by 200 r/min
(300 r/min*) or more for 10 seconds.
*: Specs in parentheses are applicable if
the maximum air temperature during the previous operation was more than 45°C (113°F).
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function -
OBD-II Drive Cycle -
Pattern
18 
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TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
- Intake system vacuum leak.
- ECM failed.
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Required Special Tools
- MB991958: Scan tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
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STEP 1. Using scan tool MB991958, read the diagnostic trouble
code (DTC).
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| caution |
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"
(OFF) position before connecting or disconnecting scan tool MB991958.
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(1)Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Set scan tool MB991958, read the DTC.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is the diagnostic trouble code other than P0507 set?
 Refer to Diagnostic Trouble Code Chart .
 Go to Step 2.
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STEP 2. Check the intake system vacuum leak.
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Q.
Are there any abnormalities?
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Repair or replace it. Then go to Step 4.
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Go to Step 3.
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STEP 3. Replace the throttle body assembly.
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(1)Replace the throttle body assembly
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(2)Carry out test drive with the drive cycle pattern. Refer to Diagnostic Function -
OBD-II
Drive Cycle -
Pattern 18 .
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(3)Check the diagnostic trouble code (DTC).
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Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP
42B, Diagnosis -ID Code Registration Judgment Table <Vehicles with KOS> or
GROUP 42C, Diagnosis -ID Codes Registration Judgment Table <Vehicles with WCM> .
Then go to Step 4.
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The inspection is complete.
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STEP 4. Test the OBD-II drive cycle.
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(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function -
OBD-II
Drive Cycle -
Pattern 18 .
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(2)Check the diagnostic trouble code (DTC).
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Retry the troubleshooting.
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The inspection is complete.
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