NR Series ENGINE CONTROL SFI SYSTEM P050500 Idle Control System
DESCRIPTION
The idle speed is controlled by the ETCS (Electronic Throttle Control System). The ETCS is comprised of: 1) the one valve type throttle body; 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; and 5) the ECM, which controls the ETCS. 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 | Idle speed continues to vary greatly from the target idle speed (2 trip detection logic). | ·
Electronic throttle control system ·
Intake system ·
PCV system ·
ECM |
Comes on | DTC stored | SAE Code: P0505 |
MONITOR DESCRIPTION
The ECM monitors the idle speed and idling air flow volume to conduct Idle Speed Control (ISC). The ECM determines that the ISC 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 (6.25 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 | Once per driving cycle |
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 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 reaches 75°C (167°F) or higher with all the accessories switched 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 shows NORMAL, the system is normal.
·If the judgment result shows ABNORMAL, the system has a malfunction.
·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 shows NORMAL, the system is normal.
·If the judgment result shows ABNORMAL, the system has a malfunction.
·[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 being not fully released.
·Refer to "Data List / Active Test" [Engine Speed, ISC F/B Torque and ISC F/B Learn 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
| *1 | Air Hole Cover |
Before inspecting the PCV valve, first check that there is no suction from the air hole cover.
- OK:
No suction from air hole cover, and PCV valve operation is normal.
- Result:
Proceed to OK NG
OK
NG
Check the intake system for vacuum leaks.
- OK:
No leaks in the intake system.
- HINT:
-
Perform "Inspection After Repair" after repairing or replacing the intake system.
- Result:
Proceed to OK NG
OK
NG
Check the throttle with motor body assembly condition.
- OK:
Throttle valve is not contaminated with foreign objects and moves smoothly.
- HINT:
-
Perform "Inspection After Repair" after replacing the throttle with motor body 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 DTCs.
- Powertrain > Engine > Trouble Codes
- 50001 372
- Result:
Result Proceed to DTCs are not output A DTC P050500 is output B
A
B