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DTC P0511 [L3]

BME010200500210

DTC P0511 | IAC valve circuit malfunction
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DETECTION CONDITION | • If PCM detects that PCM terminal 4G voltage is above or below threshold* when IAC control duty target is within18-70%, PCM determines that IAC valve circuit has malfunction. *: Detected threshold value depends on battery voltage and IAC control signal duty value. Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction conditions in first drive cycle.
• PENDING CODE is available if PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.
POSSIBLE CAUSE | • IAC valve circuit malfunction • Short to ground between IAC valve terminal A and PCM terminal 4G • Open circuit between IAC valve terminal A and PCM terminal 4G • Short to ground between IAC valve terminal B and PCM terminal 4J • Open circuit between IAC valve terminal B and PCM terminal 4J
• Short to power between IAC valve terminal A and PCM terminal 4G
• Poor connection of IAC valve connector or PCM connector
• PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE [L3].) • Is same DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].)
2 | INSPECT POOR CONNECTION OF IAC VALVE CONNECTOR • Turn the ignition switch off. • Disconnect IAC valve connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair or replace terminal, then go to Step 8.
No | Go to the next step.
3 | INSPECT IAC VALVE ELECTRICAL MALFUNCTION • Inspect IAC valve. (See IDLE AIR CONTROL (IAC) VALVE INSPECTION [L3].) • Is IAC valve normal? | Yes | Go to the next step.
No | Replace IAC valve, then go to Step 8.
4 | INSPECT CONTROL CIRCUIT FOR SHORT TO POWER • Turn the ignition switch to the ON position (Engine off). • Measure voltage between following IAC valve terminal and body ground.

  - IAC valve terminal A and body ground
  - IAC valve terminal B and body ground

• Is the voltage B+?
Yes
Repair or replace harness, then go to Step 8.
No | Go to the next step.
5 | INSPECT CONTROL CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch off. • Inspect for continuity between following IAC valve terminals and body ground.

  - IAC valve terminal A
  - IAC valve terminal B

• Is there continuity?
Yes
Repair or replace harness, then go to Step 8.
No | Go to the next step.
6 | INSPECT POOR CONNECTION OF PCM CONNECTOR • Turn the ignition switch off. • Disconnect PCM connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair terminal, then go to Step 8.
No | Go to the next step.
7 | INSPECT CONTROL CIRCUIT MALFUNCTION FOR OPEN CIRCVIT • Inspect for continuity between following IAC valve terminal and PCM terminal.

  - IAC valve terminal A and PCM terminal 4G
  - IAC valve terminal B and PCM terminal 4J

• Is there continuity?
Yes
Repair or replace harness, then go to the next step.
No | Go to the next step.
8 | VERIFY TROUBLESHOOTING OF DTC P0511 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC using WDS or equivalent. • Perform KOEO/KOER self-test. (See KOEO/KOER SELF-TEST PROCEDURE [L3].)
• Is same DTC present?
Yes
Replace PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L3].)
No | Go to the next step.
9 | 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].)
No | Troubleshooting completed.