DTC P0511 [LF]

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DTC P0511 [LF]

B3E010201087W05

DTC P0511 | IAC valve circuit problem
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DETECTION CONDITION

• If the PCM detects that PCM terminal 2E voltage is above or below threshold* when the IAC control duty target is within 16-30%, the PCM determines that the 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).
• The MIL illuminates if the PCM detects the above malfunction conditions in first consecutive drive cycles.
• PENDING CODE is available if the PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• IAC valve circuit malfunction
• Short to ground in wiring harness between IAC valve terminal A and PCM terminal 2E
• Short to ground in wiring harness between IAC valve terminal B and PCM terminal 2F
• Open circuit in wiring harness between IAC valve terminal A and PCM terminal 2E
• Open circuit in wiring harness between IAC valve terminal B and PCM terminal 2F
• Short to power supply in wiring harness between IAC valve terminal A and PCM terminal 2E
• Short to power supply in wiring harness between IAC valve terminal B and PCM terminal 2F
• Poor connection of IAC valve connector or PCM connector
• PCM malfunction

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 the FREEZE FRAME DATA on the repair order, then go to the next step.
2 | 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.
3 | INSPECT POOR CONNECTION OF IAC VALVE CONNECTOR • Turn the ignition switch off. • Disconnect IAC valve connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 9.
No | Go to the next step.
4 | INSPECT IAC VALVE ELECTRICAL MALFUNCTION • Inspect the IAC valve. (See IDLE AIR CONTROL (IAC) VALVE INSPECTION [LF].) • Is IAC valve normal? | Yes | Go to the next step.
No | Replace IAC valve, then go to Step 9.

5

INSPECT CONTROL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch to the ON position (Engine off).
• Measure voltage between following terminal (wiring harness-side) and body ground:

  - IAC valve terminal A
  - IAC valve terminal B

• Is the voltage B+?

Yes

Repair or replace wiring harness, then go to Step 9.

No | Go to the next step.

6

INSPECT CONTROL CIRCUIT FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between following terminals (wiring harness-side) and body ground:

  - IAC valve terminal A
  - IAC valve terminal B

• Is there continuity?

Yes

Repair or replace the wiring harness, then go to Step 9.

No | Go to the next step.
7 | INSPECT POOR CONNECTION OF PCM CONNECTOR • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction? | Yes | Repair the terminal, then go to Step 9.
No | Go to the next step.

8

INSPECT CONTROL CIRCUIT MALFUNCTION FOR OPEN CIRCUIT
• Inspect for continuity following terminals (wiring harness-side):

  - Between IAC valve terminal A and PCM terminal 2E
  - Between IAC valve terminal B and PCM terminal 2F

• Is there continuity?

Yes

Repair or replace the wiring harness, then go to the next step.

No | Go to the next step.
9 | VERIFY TROUBLESHOOTING OF DTC P0511 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC using the WDS or equivalent. • Start the engine. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [LF].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [LF].) • Are any DTC present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [LF].)
No | Troubleshooting completed.