DTC P0505:00 [MZI-3.7]

id0102d2704900

DTC P0505:00 | Idle speed control system problem
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DETECTION CONDITION | • The PCM attempts to control engine speed during the KOER self-test. The test fails when the desired engine speed could not be reached or controlled during the self-test.
POSSIBLE CAUSE | • Intake air restriction • Vacuum leakage • Throttle body malfunction • Sludged throttle body • Mechanical concern with engine (Insufficient compression) • Exhaust restriction • Failure mode effects management condition is present. • PCM malfunction Note • This DTC is informational only and it may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not present inspect the intake air system for air restrictions, vacuum leaks, and damage. If no concerns are present, clear the DTC and repeat the self-test.

Diagnostic procedure

STEP | INSPECTION | ACTION
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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 the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE 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 CODE OR STORED DTCs • Turn the ignition switch off then to the ON position (Engine off). • Verify related pending code or stored DTCs. • Are other DTCs present? | Yes | Go to the appropriate DTC troubleshooting. (See DTC TABLE [MZI-3.7].)
No | Go to the next step.
4 | INSPECT AIR CLEANER ELEMENT • Remove 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.
5 | INSPECT FOR AIR SUCTION AT INTAKE AIR SYSTEM • Inspect for air leakage at the following: ― Around connection of dynamic chamber and intake manifold ― Around connection of intake manifold and cylinder head • Is air leakage found? | Yes | Repair or replace the suspected part, then go to Step 9.
No | Go to the next step.
6 | INSPECT THROTTLE BODY PASSAGE • Is the throttle body clogged? | Yes | Clean or replace the throttle body passage, then go to Step 9.
No | Go to the next step.
7 | INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [MZI-3.7].) • Is the engine compression normal? | Yes | Go to the next step.
No | Overhaul the engine, then go to the next step.
8 | INSPECT FOR RESTRICTION IN EXHAUST SYSTEM AND TWC • Is there any restriction? | Yes | Replace malfunctioning part, then go to the next step.
No | Go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC P0505:00 HAS BEEN COMPLETED • Verify that all disconnected connectors are reconnected. • Turn the ignition switch to the ON position (Engine off). • Clear the DTC from the PCM memory using the M-MDS. • Perform the KOER self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) • Is the PENDING CODE for this DTC present? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Troubleshooting completed.