4.
Read "DTC Status" parameter
The Idle Charge Actuator Valve(ICAV) is installed on the intake manifold and controls the intake airflow that throttle plate to keep constant engine speed when the throttle valve is closed. The function of the ICA valve according to various engine loads and conditions, and also to provide additional air during starting. The ICA opening coil, a closing coil, and a permanent magnet. Based on information from various sensors, the ECM grounding their control circuits. According to the control signals from the ECM, the valve rotor rotates to con into the engine.
PCM sets DTC P1508 if the PCM detects that the ICAV(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 | ● 10< Battery voltage <16V ● 20%< ICA duty <80% | |
Threshold Value | ● Short to battery | |
Diagnostic Time | ● 1 sec. | |
Fail-Safe | ● PCM controls idle speed with predetermined value |
Temp.(℃) | Temp.(℉) | ICA Coil #1 (OPEN)(Ω) | Temp.(℃) | Temp.(℉) | ICA Coil #1 (OPEN)(Ω) |
-20 | -4 | 9.2 ~ 10.8 | 40 | 104 | 12.0 ~ 13.6 |
-10 | 14 | 9.7 ~ 11.3 | 50 | 122 | 12.4 ~ 14.0 |
0 | 32 | 10.2 ~ 11.8 | 60 | 140 | 12.9 ~ 14.5 |
10 | 50 | 10.6 ~ 12.2 | 70 | 158 | 13.4 ~ 15.0 |
20 | 68 | 11.1 ~ 12.7 | 80 | 176 | 13.8 ~ 15.4 |
30 | 86 | 11.5 ~ 13.1 | 100 | 212 | 14.7 ~ 16.3 |
Temp.(℃) | Temp.(℉) | ICA Coil #2 (CLOSE)(Ω) | Temp.(℃) | Temp.(℉) | ICA Coil #2 (CLOSE)(Ω) |
-20 | -4 | 12.1 ~ 13.7 | 40 | 104 | 15.7 ~ 17.3 |
-10 | 14 | 12.8 ~ 14.4 | 50 | 122 | 16.3 ~ 17.9 |
0 | 32 | 13.4 ~ 15.0 | 60 | 140 | 16.9 ~ 18.5 |
10 | 50 | 14.0 ~ 15.6 | 70 | 158 | 17.4 ~ 19.0 |
20 | 68 | 14.5 ~ 16.1 | 80 | 176 | 18.0 ~ 19.6 |
30 | 86 | 15.1 ~ 16.7 | 100 | 212 | 19.2 ~ 20.8 |
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 the PCM's connector was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
▶ 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 "ON" & Engine "OFF".
Measure voltage between terminal 2 of the valve 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 main relay. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "OFF".
Disconnect PCM connector.
Ignition "ON".
Measure voltage between terminal 3 of valve harness connector and chassis ground.
Specification : Approx. 0V
Is voltage within the specification?
▶ Check for poor connection between PCM 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 valve connector.
Measure resistance between terminals 2 and 3 of the valve connector(Component side)
Temp.(℃) | Temp.(℉) | ICA Coil #2 (CLOSE)(Ω) | Temp.(℃) | Temp.(℉) | ICA Coil #2 (CLOSE)(Ω) |
-20 | -4 | 12.1 ~ 13.7 | 40 | 104 | 15.7 ~ 17.3 |
-10 | 14 | 12.8 ~ 14.4 | 50 | 122 | 16.3 ~ 17.9 |
0 | 32 | 13.4 ~ 15.0 | 60 | 140 | 16.9 ~ 18.5 |
10 | 50 | 14.0 ~ 15.6 | 70 | 158 | 17.4 ~ 19.0 |
20 | 68 | 14.5 ~ 16.1 | 80 | 176 | 18.0 ~ 19.6 |
30 | 86 | 15.1 ~ 16.7 | 100 | 212 | 19.2 ~ 20.8 |
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.
