DTC P0506 [L3]


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 less than 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). • MIL illuminates if PCM detects the above malfunction conditions 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 PCM detects the above malfunction condition during 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


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		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.
2		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 any other DTC present?	Yes	Repair applicable DTCs. (See DTC TABLE [L3].)
3		No	Go to the next step.
4	INSPECT IAC VALVE MALFUNCTION • Perform IAC valve inspection. (See IDLE AIR CONTROL (IAC) VALVE INSPECTION [L3].) • Is IAC valve normal?	Yes	Go to the next step.
4		No	Replace IAC valve, then go to Step 11.
5	INSPECT A/C MAGNET CLUTCH OPERATION • Turn blower motor switch off. • Is magnet clutch still on?	Yes	Go to "A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY." of ENGINE SYMPTOM TROUBLESHOOTING then go to step 11. (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L3].)
5		No	Go to the next step.
6	INSPECT PURGE SOLENOID VALVE MALFUNCTION • Perform purge solenoid valve inspection. (See PURGE SOLENOID VALVE INSPECTION [L3].) • Is purge solenoid valve normal?	Yes	Go to the next step.
6		No	Replace purge solenoid valve, then go to Step 11.
7	INSPECT AIR CLEANER ELEMENT • Remove air cleaner element with engine running. • Does engine speed increase?	Yes	Replace air cleaner element, then go to Step 11.
7		No	Go to the next step.
8	INSPECT THROTTLE BODY PASSAGE • Is throttle body clogged?	Yes	Clean or replace throttle body passage, then go to Step 11.
8		No	Go to the next step.
9	INSPECT ENGINE COMPRESSION • Inspect engine compression. (See COMPRESSION INSPECTION [L3].) • Is compression normal?	Yes	Go to the next step.
9		No	Overhaul engine, then go to Step 11.
10	INSPECT GENERATOR • Perform generator inspection. (See GENERATOR INSPECTION [L3].) • Is generator normal?	Yes	Go to the next step.
10		No	Repair or replace 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 DTC from PCM memory using WDS or equivalent. • Depress brake pedal for 14.1 s or more. • Is PENDING CODE of same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3].)
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L3].)
12		No	Troubleshooting completed.