DTC P0511 [ZY, Z6]

id0102c7821200

DTC P0511

IAC circuit problem

DETECTION CONDITION

• If the PCM detects that the IAC signal voltage is above or below the threshold* when the IAC control duty target is within 19-50%, the PCM determines that the IAC circuit problem.
*: Detected threshold value depends on the battery voltage and the IAC control signal duty value.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• 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 malfunction
• Connector or terminal malfunction
• Open circuit in wiring harness between IAC valve terminal A and PCM terminal 2X
• Short to power supply in wiring harness between IAC valve terminal A and PCM terminal 2X
• Short to GND in wiring harness between IAC valve terminal A and PCM terminal 2X
• Open circuit in wiring harness between IAC valve terminal B and PCM terminal 2AB
• Short to power supply in wiring harness between IAC valve terminal B and PCM terminal 2AB
• Short to GND in wiring harness between IAC valve terminal B and PCM terminal 2AB
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

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 IAC VALVE CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the 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 CIRCUIT FOR SHORT TO GND
• Turn the ignition switch off.
• Inspect for continuity between the following circuits:
- IAC valve terminal A (wiring harness-side) and body GND
- IAC valve terminal B (wiring harness-side) and body GND
• Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to GND, then go to Step 9.
No
Go to the next step.
5
INSPECT IAC VALVE CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between the following circuits:
- IAC valve terminal A (wiring harness-side) and body GND
- IAC valve terminal B (wiring harness-side) and body GND
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
No
Go to the next step.
6
INSPECT IAC VALVE
• Inspect the IAC valve.
• Is there any malfunction?
Yes
Replace the IAC valve, then go to Step 9.
No
Go to the next step.
7
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• 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 or replace the terminal, then go to Step 9.
No
Go to the next step.
8
INSPECT IAC VALVE CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between the following circuits:
- IAC valve terminal A (wiring harness-side) and PCM terminal 2X (wiring harness-side)
- IAC valve terminal B (wiring harness-side) and PCM terminal 2AB (wiring harness-side)
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0511 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.