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DTC P0511 [AJ]

BME010200500W01

DTC P0511 | IAC system malfunction
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DETECTION CONDITION | • If the PCM detects that the IAC signal voltage is above 4.7 V or below 1.0 V when the IAC control duty target is within 20-100%, the PCM determines that the IAC circuit problem. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycles.
• PENDING CODE is available if the 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 in wiring harness between IAC valve terminal A and main relay terminal 87 • Short to ground in wiring harness between IAC valve terminal B and PCM terminal 88 • Open circuit in wiring harness between IAC valve terminal A and main relay terminal 87
• Open circuit in wiring harness between IAC valve terminal B and PCM terminal 88
• Short to power supply in wiring harness between IAC valve terminal A and main relay terminal 87
• Short to power supply in wiring harness between IAC valve terminal B and PCM terminal 88
• 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 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed)).) • 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 IAC valve terminal B (wiring harness-side) and body ground: • 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 87
  - Between IAC valve terminal B and PCM terminal 88

• 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 [AJ].)
No | Go to the next step.
10 | VERIFY AFTER SERVICE PRECAUTION • Perform the "AFTER SERVICE PRECAUTION". (See AFTER REPAIR PROCEDURE [AJ].) • Are any DTC present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed)).)
No | Troubleshooting completed.