4.
Read "DTC Status" parameter.
The Idle Charge Actuator (ICA) vlave is installed on the intake manifold and controls the intake airflow that is bypassed around the throttle plate to keep constant engine speed when the throttle vlave is closed. The function of the ICA valve is to maintain idle speed according to various engine loads and conditons, and also to provide additional air during starting. The ICA vlave consists of an opening coil, a closing coil, and a permanent magnet. Based on information from various sensor, the ECM controls both coils by grounding their control circuits. According to the control signals from the ECM, the valve rotor rotates to control the by pass airflow into the engine.
ECM sets DTC P1508 if the ECM detects that the ICA(CLOSE) control circuit is short to battery.
ITEM | DETECTING CONDITION | POSSIBLE CAUSE |
DTC Strategy | ● Driver stage check | ● Short to battery in harness ● Contact resistance in connectors ● Faulty ICA valve |
Enable Conditions | ● Battery voltage >10V | |
Threshold Value | ● Short to battery | |
Diagnostic Time | ● 1 sec. |
SPECIFICATION | |
Opening Coil | Closing Coil |
15~16.2Ω | 17~18.2 Ω |
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Press F4(DTAL) to select DTC information from the DTCs menu.
Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
History (Not Present) fault : DTC occurred but has been cleared.
Present fault : DTC is occurring at present time.
▶ Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to "Component Inspection" procedure.
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to "Power Supply Circuit Inspection" procedure.
Ignition "OFF".
Disconnect ICA connector.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal 2 of the ICA harness connector and chassis ground.
Specification : Approx. B+
Is voltage within the specification?
▶ Go to "Signal Circuit Inspection" procedure.
▶ Check for an open or short to ground in the power supply circuit between the ICA valve and fuel pump relay. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal 3 of the ICA harness connector and chassis ground.
Specification : Approx. 0.5~0.6V
Is voltage within the specification?
▶ Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
▶ Go to next step as below.
Check for short to power in signal harness
Ignition "OFF".
Disconnect ECM connector
Ignition "ON"
Measure voltage between terminal 3 of the ICA harness connector and chassis ground
Specification : Approx. 0V
Is voltage within the specification?
▶ Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
▶ Repair short in harness and go to "Verification of Vehicle Repair" procedure.
Ignition "OFF".
Disconnect ICA connector.
Measure resistance between terminals 2 and 3 of the actuator connector(Component side).
Specification : 17~18.2Ω
Is resistance within the specification?
▶ Go to next step as below.
▶ Check ICA for contamination, deterioration, or damage. Substitute with a known-good ICA and check for proper operation. If the problem is corrected, replace ICA and then go to "Verification of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
▶ System performing to specification at this time. Clear the DTC
▶ Go to the applicable troubleshooting procedure.
