M20D-FKS ENGINE CONTROL SFI SYSTEM P050500 Idle Control System
DESCRIPTION
The idle speed is controlled by the electronic throttle control system. The electronic throttle control system is comprised of: 1) one valve type throttle body with motor assembly; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position sensor, which detects the accelerator pedal position; 5) the ECM, which controls the electronic throttle control system. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P050500 | Idle Control System | The idle speed differs largely from the target idle speed (2 trip detection logic). | ·
Electronic throttle control system ·
Intake system ·
PCV hose connection ·
EGR valve assembly ·
ECM |
Comes on | DTC stored | SAE: P0505 |
MONITOR DESCRIPTION
The ECM monitors the idle speed and idling air flow volume to conduct idle speed control. The ECM determines that the idle speed control system is malfunctioning if either of the following conditions is met:
The difference between the target engine idle speed and actual engine idle speed exceeds the threshold and the idle control correction value is stuck at the upper or lower limit for 5 seconds or more.
After driving at a vehicle speed of 10 km/h (6 mph) or more, the difference between the target and actual engine idle speed exceeds the threshold 5 times or more during a driving cycle, and then the system determines that the idle control correction value is stuck at the upper or lower limit, or that the idle control correction value has been changed by an amount that exceeds the threshold.
MONITOR STRATEGY
| Required Sensors/Components (Main) | Electronic throttle control system |
| Required Sensors/Components (Related) | Crankshaft position sensor
Engine coolant temperature sensor Vehicle speed sensor |
| Frequency of Operation | Continuous |
TYPICAL MALFUNCTION THRESHOLDS
| Either of the following conditions is met | 1 or 2 |
| 1. Both of the following conditions A and B met | - |
| A. Engine speed - Target engine speed | Less than -100 rpm, or higher than 150 rpm (A/C off and NSW off)
Less than -100 rpm, or higher than 200 rpm (A/C on or NSW on) |
| B. Idle control correction value | -7 Nm or less, or 15 Nm or more for 5 seconds or more |
| 2. Both of the following conditions C and D met | - |
| C. Frequency that all of following conditions (a), (b) and (c) met | 5 times or more |
| (a) Engine speed - Target engine speed | Less than -100 rpm, or higher than 150 rpm (A/C off and NSW off)
Less than -100 rpm, or higher than 200 rpm (A/C on or NSW on) |
| (b) Idle control learning value (value when last idle) | -5 Nm or less, or 10 Nm or more |
| (c) Vehicle condition | Stopped after being driven at 10 km/h (6.25 mph) or more |
| D. Amount of change in idle control correction value | -12.09 Nm or less, or 7.16 Nm or more |
CONFIRMATION DRIVING PATTERN
- HINT:
- ·
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
·When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON [A].
Turn the GTS on.
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the A/C switch and all the accessories off [B].
Idle the engine for 5 minutes or more [C].
- HINT:
-
In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
- HINT:
- ·
If a pending DTC is output, the system is malfunctioning.
·If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P050500.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
- HINT:
- ·
If the judgment result is NORMAL, the system is normal.
·If the judgment result is ABNORMAL, the system is malfunctioning.
·If the judgment result is INCOMPLETE, perform steps [E] through [F].
·[A] to [D]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
·When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
Accelerate the vehicle to 10 km/h (6.25 mph) or more, and then idle the engine for 20 seconds or more [E].
- CAUTION:
-
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Repeat step [E] 5 times.
Enter the following menus: Powertrain / Engine / Trouble Codes [F].
Read the pending DTCs.
- HINT:
- ·
If a pending DTC is output, the system is malfunctioning.
·If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P050500.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
- HINT:
- ·
If the judgment result is NORMAL, the system is normal.
·If the judgment result is ABNORMAL, the system is malfunctioning.
·[A] to [F]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
·When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
CAUTION / NOTICE / HINT
- HINT:
- ·
The following conditions may also cause DTC P050500 to be stored:
(a)If the floor carpet or floor mat is resting slightly on the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open.
(b)The accelerator pedal is not fully released.
·Refer to "Data List / Active Test" [Engine Speed, ISC F/B Learn Torque and ISC F/B Torque].
·Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
PROCEDURE
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
- Powertrain > Engine > Trouble Codes
- 50001 372
- Result:
Result Proceed to DTC P050500 is output A DTC P050500 and other DTCs are output B
- HINT:
-
If any DTCs other than P050500 are output, troubleshoot those DTCs first.
A
B
Check the PCV hose connections.
Check the PCV valve.
- OK:
PCV hose and PCV valve are connected correctly and are not damaged.
- Result:
Proceed to OK NG
OK
NG
Check the intake system for vacuum leaks.
- OK:
No leaks from the intake system.
- HINT:
-
Perform "Inspection After Repair" after repairing or replacing the intake system.
- Result:
Proceed to OK NG
OK
NG
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.
- HINT:
-
The A/C switch and all accessories should be off.
Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Engine Speed, Intake Manifold Absolute Pressure and Coolant Temperature.
- Powertrain > Engine > Active Test
-
Active Test Display Control the EGR Step Position -
Data List Display Engine Speed Intake Manifold Absolute Pressure Coolant Temperature - 50004 372 25 211,385,205
Check the engine idling condition and Intake Manifold Absolute Pressure values in the Data List while performing the Active Test.
- NOTICE:
- ·
Do not leave the EGR valve open for 10 seconds or more during the Active Test.
·Be sure to return the EGR valve to step 0 when the Active Test is completed.
·Do not open the EGR valve 30 steps or more during the Active Test.
- OK:
The value of Intake Manifold Absolute Pressure and Engine Speed change in response to EGR step position.
- Standard:
- Control the EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls Intake Manifold Absolute Pressure
(Data List)Intake Manifold Absolute Pressure value is 18 to 38 kPa(abs) (2.6 to 5.5 psi(abs))
(EGR valve is fully closed)Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed
- HINT:
-
During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.
- Result:
Proceed to OK NG
OK
NG
Remove the EGR valve assembly.
Check if the EGR valve is stuck open.
- OK:
EGR valve is tightly closed.
- HINT:
-
Perform "Inspection After Repair" after replacing the EGR valve assembly.
- Result:
Proceed to OK NG
OK
NG
Check the throttle body with motor assembly condition.
- OK:
Throttle valve is not contaminated with foreign matter and moves smoothly.
- HINT:
-
Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
- Result:
Proceed to OK NG
OK
NG
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs.
- Powertrain > Engine > Clear DTCs
- 50002 372
Turn the ignition switch off and wait for at least 30 seconds.
- Result:
Proceed to NEXT
NEXT
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
- Powertrain > Engine > Trouble Codes
- 50001 372
- Result:
Result Proceed to DTCs are not output A DTC P050500 is output B
A
B