P0505

DTC P0505 - IDLE CONTROL SYSTEM CIRCUIT LOW INPUT

DTC DETECTING CONDITION:
- Immediately at fault recognition

TROUBLE SYMPTOM:
- Erroneous idling
- Engine stalls.
- Engine breathing

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How To Clear Diagnostic Trouble Codes.

Wiring Diagram:

WIRING DIAGRAM

10AU1: CHECK OUTPUT SIGNAL FROM ECM.

1. Turn ignition switch to ON.

Connector & Terminal - (B134) No.5 (+) - Chassis Ground (-):

2. Measure voltage between ECM and chassis ground.

CHECK: Is the voltage more than 3 V?

YES: Repair poor contact in ECM connector.

NO: Go to step 10AU2.

10AU2: CHECK POWER SUPPLY TO IDLE AIR CONTROL SOLENOID VALVE.

1. Turn ignition switch to OFF.
2. Disconnect connector from idle air control solenoid valve.
3. Turn ignition switch to ON.

Connector & Terminal - [(E7) No.2 (+) - Engine Ground (-)]:

4. Measure voltage between idle air control solenoid valve and engine ground.

CHECK: Is the voltage more than 10 V?

YES: Go to step 10AU3.

NO: Repair harness and connector.

NOTE: In this case, repair the following:
- Open circuit in harness between idle air control solenoid valve and main relay connector
- Poor contact in coupling connector (B22)

10AU3: CHECK HARNESS BETWEEN ECM AND IDLE AIR CONTROL SOLENOID VALVE CONNECTOR.

1. Turn ignition switch to OFF.
2. Disconnect connector from ECM.

Connector & Terminal - [(B134) No.5 - (EZ) No.1]:

3. Measure resistance of harness between ECM and idle air control solenoid valve connector.

CHECK: Is the resistance less than 1 Ohm?

YES: Go to step 10AU4.

NO: Repair harness and connector.

NOTE: In this case, repair the following:
- Open circuit in harness between ECM and idle air control solenoid valve connector
- Poor contact in coupling connector (B21)

10AU4: CHECK HARNESS BETWEEN ECM AND IDLE AIR CONTROL SOLENOID VALVE CONNECTOR.

Connector & Terminal - [[(B134) No.5 - Chassis Ground]:

Measure resistance of harness between ECM and chassis ground.

CHECK: Is the resistance less than 10 Ohms?

YES: Repair ground short circuit in harness between ECM and idle air control solenoid valve connector.

NO: Go to step 10AU5.

10AU5: CHECK GROUND CIRCUIT OF IDLE AIR CONTROL SOLENOID VALVE.

Connector & Terminal - [[(E7) No.3 - Engine Ground]:

Measure resistance of harness between idle air control solenoid valve connector and engine ground.

CHECK: Is the resistance less than 5 Ohms?

YES: Go to step 10AU6.

NO: Repair open circuit in harness between idle air control solenoid valve connector and engine ground terminal.

10AU6: CHECK POOR CONTACT
Check poor contact in ECM and idle air control solenoid valve connectors.

CHECK: is there poor contact in ECM and idle air control solenoid valve connectors?

YES: Repair poor contact in ECM and idle air control solenoid valve connectors.

NO: Replace idle air control solenoid valve.