DTC P0505 [ZJ, Z6]

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DTC P0505 [ZJ, Z6]

B3E010200500W02

DTC P0505 | IAC system problem
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DETECTION CONDITION | • The PCM cannot control idle speed toward target idle speed while KOER self test.

POSSIBLE CAUSE

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

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
2 | VERIFY RELATED PENDING OR STORED DTC • Turn the ignition switch off, then to the ON position. (Engine OFF) • Verify pending code or stored DTCs using the WDS or equivalent. • Does DTC P0511,P2502, P2503 or P2504 present? | Yes | Perform the applicable DTC troubleshooting. (See DTC TABLE [ZJ, Z6].)
No | Go to the next step.
3 | INSPECT IAC VALVE MALFUNCTION • Start engine. • Disconnect IAC valve connector. • Is engine speed decreased? | Yes | Go to the next step.
No | Repair the IAC valve, then go to Step 9. (See IDLE AIR CONTROL (IAC) VALVE REMOVAL/INSTALLATION [ZJ, Z6].)

4

INSPECT A/C MAGNETIC CLUTCH OPERATION

  Note

  • The following test should be performed for A/C. Go to the next step for vehicles without A/C.

• Turn the A/C switch off.
• Is magnetic clutch still on?

Yes

Go to "A/C ALWAYS ON / A/C COMPRESSOR RUNS CONTINUOUSLY." of ENGINE SYMPTOM TROUBLESHOOTING, then go to step 9.
(See ENGINE SYMPTOM TROUBLESHOOTING [ZJ, Z6].)

No | Go to the next step.
5 | INSPECT GENERATOR CONTROL CIRCUIT MALFUNCTION • Apply electrical load. • Is engine speed increased? | Yes | Go to the next step.
No | Repair short to power supply in generator control circuit, 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 | Clean or replace the air cleaner element, then go to Step 9.
No | Go to the next step.
7 | INSPECT THROTTLE BODY PASSAGE • Is throttle body clogged? | Yes | Clean the throttle body passage or replace the throttle body, then go to Step 9.
No | Go to the next step.
8 | INSPECT ENGINE COMPRESSION • Inspect engine compression. (See COMPRESSION INSPECTION [ZJ, Z6].) • Is engine compression normal? | Yes | Go to the next step.
No | Overhaul engine, then go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC using the WDS or equivalent. • Perform KOER self-test. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [ZJ, Z6].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [ZJ, Z6].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [ZJ, Z6].)
No | DTC troubleshooting completed.