DTC P0511[ZJ, ZY, Z6]

id0102c1821200


Without Throttle Valve Actuator Only

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 ground 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 ground 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 SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service 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 GROUND
•  Turn the ignition switch off.
•  Inspect for continuity between the following circuits:
―  IAC valve terminal A (wiring harness-side) and body ground
―  IAC valve terminal B (wiring harness-side) and body ground
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, 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 ground
―  IAC valve terminal B (wiring harness-side) and body ground
•  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.
(See IDLE AIR CONTROL (IAC) VALVE REMOVAL/INSTALLATION[ZJ, ZY, Z6].)
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 M-MDS.
•  Start the engine.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION[ZJ, ZY, Z6].)
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.
(See DTC TABLE[ZJ, ZY, Z6].)
No
DTC troubleshooting completed.