DTC P0511


DTC P0511	Idle control system circuit malfunction
DETECTION CONDITION	• If the PCM detects that the PCM terminal 2X voltage is above or below the threshold^* when the IAC control duty target is within 19-50%, the PCM determines that the IAC valve circuit has a malfunction. : 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 PCM detects the above malfunction conditions in the first consecutive drive cycle. • The PENDING CODE is available if the PCM detects the above malfunction condition. • The FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• IAC valve circuit malfunction • Short to ground between IAC valve terminal A and PCM terminal 2X • Short to ground between IAC valve terminal B and PCM terminal 2AB • Open circuit between IAC valve terminal A and PCM terminal 2X • Open circuit between IAC valve terminal B and PCM terminal 2AB • Short to power between IAC valve terminal A and PCM terminal 2X • Short to power between IAC valve terminal B and PCM terminal 2AB • Poor connection of IAC valve connector or PCM connector • PCM malfunction


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE.) • Is the same DTC present?	Yes	Go to the next step.
1		No	Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING.)
2	INSPECT IAC VALVE FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the IAC valve connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 8.
2		No	Go to the next step.
3	INSPECT IAC VALVE FOR ELECTRICAL MALFUNCTION • Inspect the IAC valve. (See IDLE AIR CONTROL (IAC) VALVE INSPECTION.) • Is the IAC valve normal?	Yes	Go to the next step.
3		No	Replace the 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 the voltage between following terminals and body ground: - IAC valve terminal A (wiring harness-side) - IAC valve terminal B (wiring harness-side) • Is the voltage B+?	Yes	Repair or replace the wiring harness, then go to Step 8.
4		No	Go to the next step.
5	INSPECT CONTROL CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch off. • Inspect for continuity between the following terminals and body ground: - IAC valve terminal A (wiring harness-side) - IAC valve terminal B (wiring harness-side) • Is there continuity?	Yes	Repair or replace the wiring harness, then go to Step 8.
5		No	Go to the next step.
6	INSPECT PCM FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair the terminal, then go to Step 8.
6		No	Go to the next step.
7	INSPECT CONTROL CIRCUIT MALFUNCTION FOR OPEN CIRCUIT • Inspect for continuity between the following terminals: - Between IAC valve terminal A (wiring harness-side) and PCM terminal 2X (wiring harness-side) - Between IAC valve terminal B (wiring harness-side) and PCM terminal 2AB (wiring harness-side) • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness, then go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0511 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC using the WDS or equivalent. • Perform the KOEO/KOER self-test. (See KOEO/KOER SELF-TEST.) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE.)
9		No	Troubleshooting completed.