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DTC P0506 [L8, LF, L3]

id0102a1808600

DTC P0506 | Idle control system RPM lower than expected
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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 (PSP) switch is off). Note • If intake air temperature is below -10 °C {14 °F}, the PCM cancels diagnosis of P0506. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the 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 the PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Electronic throttle control system 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
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service information. If the 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 the WDS or equivalent. • Are other DTCs present? | Yes | Repair the applicable DTCs. (See DTC TABLE [L8, LF, L3].)
No | Go to the next step.
4 | INSPECT A/C MAGNET CLUTCH OPERATION • Turn the fan 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 9. (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L8, LF, L3].)
No | Go to the next step.
5 | INSPECT PURGE SOLENOID VALVE MALFUNCTION • Inspect the purge solenoid valve. (See PURGE SOLENOID VALVE INSPECTION [L8, LF, L3].) • Is purge solenoid valve normal? | Yes | Go to the next step.
No | Replace the purge solenoid valve, then go to Step 9.
6 | INSPECT AIR CLEANER ELEMENT • Remove the air cleaner element with the engine running. • Is the engine speed increased? | Yes | Replace the air cleaner element, then go to Step 9.
No | Go to the next step.
7 | INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [L8, LF, L3].) • Is the engine compression normal? | Yes | Go to the next step.
No | Overhaul the engine, then go to Step 9.
8 | INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [L8, LF, L3, L3 Turbo].) • Is the generator normal? | Yes | Go to the next step.
No | Repair or replace the related part, then go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC P0506 COMPLETED • Make sure to reconnect all disconnected connectors. • Start the engine. • Clear the DTC from the PCM memory using the WDS or equivalent. • Depress the brake pedal for 14 s or more. • Is the PENDING CODE for this DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Is any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.