DTC P0506 [AJ]

BME010200500203

DTC P0506

Idle control system RPM lower than expected

DETECTION CONDITION

• Actual idle speed is lower than expected by 100 rpm for 14 s, when brake pedal is depressed (brake switch is ON) and steering wheel is held straight ahead (power steering pressure switch is OFF).
Note
• If atmospheric pressure is below 72.3 kPa {542 mmHg, 21.3 inHg} or intake air temperature is below -10 °C {14 °F}, PCM cancels diagnosis of P0506.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.

POSSIBLE CAUSE

• IAC valve malfunction
• Air cleaner element clogged
• Air intake passage clogged
• A/C relay control circuit malfunction
• Generator malfunction
• Purge solenoid valve malfunction
• Low engine compression (Over capacity of blow-by gas)
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY RELATED PENDING OR STORED DTCS
• Turn the ignition switch off, then to the ON position (Engine off).
• Verify pending code or stored DTCs using WDS or equivalent.
• Is other DTC present?
Yes
Repair applicable DTCs.
No
Go to the next step.
4
INSPECT IAC VALVE MALFUNCTION
• Perform IAC valve inspection.
• Is the IAC valve normal?
Yes
Go to the next step.
No
Replace the IAC valve, then go to Step 11.
5
INSPECT A/C MAGNET CLUTCH OPERATION
• Turn blower motor switch off.
• Is the magnet clutch still on?
Yes
Refer to "A/C is always on or A/C compressor runs continuously." of ENGINE SYMPTOM TROUBLESHOOTING, then go to Step 11.
No
Go to the next step.
6
INSPECT PURGE SOLENOID VALVE MALFUNCTION
• Perform purge solenoid valve inspection.
• Is the purge solenoid valve normal?
Yes
Go to the next step.
No
Replace the purge solenoid valve, then go to Step 11.
7
INSPECT AIR CLEANER ELEMENT
• Remove air cleaner element with engine running.
• Is engine speed increased?
Yes
Replace air cleaner element, then go to Step 11.
No
Go to the next step.
8
INSPECT THROTTLE BODY PASSAGE
• Is the throttle body clogged?
Yes
Clean or replace throttle body passage, then go to Step 11.
No
Go to the next step.
9
INSPECT ENGINE COMPRESSION
• Inspect engine compression.
• Is engine compression normal?
Yes
Go to the next step.
No
Overhaul the engine, then go to Step 11.
10
INSPECT GENERATOR
• Perform generator inspection.
• Is the generator normal?
Yes
Go to the next step.
No
Repair or replace the related part, then go to the next step.
11
VERIFY TROUBLESHOOTING OF DTC P0506 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Start engine.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Depress brake pedal for 14.1 s or above.
• Is the PENDING CODE of same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
12
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.