DTC P0505 [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME010200500202

DTC P0505

IAC valve circuit malfunction

DETECTION CONDITION

• The PCM monitors the IAC valve circuit current while IAC duty is above 18%. If the PCM detected IAC valve circuit current below 100 mA (25 °C {77 °F}) or above 4.5 A (25 °C {77 °F}) for 1 s, the PCM determines that the IAC valve circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
• PENDING CODE is not available.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• IAC valve circuit malfunction
• Short to ground between IAC valve terminal A and PCM terminal 54
• Open circuit between IAC valve terminal A and PCM terminal 54
• Short to ground between IAC valve terminal B and PCM terminal 83
• Short to power between IAC valve terminal B and PCM terminal 83
• Open circuit between IAC valve terminal B and PCM terminal 83
• Poor connection of IAC valve connector or PCM connector
• 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 FREEZE FRAME DATA on repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to the next step.
No
Go to the next step.
3
CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN
• Clear DTC using WDS or equivalent.
• Start engine and warm it up completely.
• Is the same DTC detected?
Yes
Go to the next step.
No
Go to intermittent concern.
4
INSPECT IAC VALVE CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect IAC valve connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 14.
No
Go to the next step.
5
INSPECT IAC VALVE
• Perform IAC valve inspection.
• Is the IAC valve normal?
Yes
Go to the next step.
No
Replace the IAC valve, then go to Step 14.
6
CLASSIFY MALFUNCTION AT POWER SUPPLY CIRCUIT OR CONTROL CIRCUIT
• Turn the ignition switch to the On position (Engine off).
• Measure the voltage between IAC valve terminal A (wiring harness-side) and body ground.
• Is the voltage B+?
Yes
Malfunction at control circuit.
Go to step 10.
No
Malfunction at power supply circuit.
Go to the next step.
7
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair the terminal, then go to Step 14.
No
Go to the next step.
8
INSPECT POWER CIRCUIT FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between IAC valve terminal A (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground, then go to Step 14.
No
Go to the next step.
9
INSPECT POWER CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off
• Disconnect PCM connector.
• Inspect for continuity between IAC valve terminal A (wiring harness-side) and PCM terminal 54.
• Is there continuity?
Yes
Repair or replace the wiring harness for open circuit, then go to Step 14.
No
Go to step 14.
10
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out terminals, corrosion).
• Is there any malfunction?
Yes
Repair the terminal, then go to Step 14.
No
Go to the next step.
11
INSPECT CONTROL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch to the On position (Engine off).
• Measure the voltage between IAC valve terminal B (wiring harness-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for short to power supply, then go to Step 14.
No
Go to the next step.
12
INSPECT CONTROL CIRCUIT FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between IAC valve terminal B (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground, then go to Step 14.
No
Go to the next step.
13
INSPECT CONTROL CIRCUIT MALFUNCTION FOR OPEN CIRCUIT
• Disconnect the PCM connector.
• Inspect for continuity between IAC valve terminal B (wiring harness-side) and PCM terminal 83.
• Is there continuity?
Yes
Repair or replace the wiring harness for open circuit, then go to the next step.
No
Go to the next step.
14
VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Start the engine and warm it up completely.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
15
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.