P0505

2AZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0505: Idle Control System Malfunction

DTC P0505 - Idle Control System Malfunction

DESCRIPTION

The idle speed is controlled by the ETCS (Electronic Throttle Control System). The ETCS is comprised of: 1) a one valve type throttle body; 2) a throttle actuator, which operates the throttle valve; 3) a Throttle Position (TP) sensor, which detects the opening angle of the throttle valve; 4) an Accelerator Pedal Position (APP) sensor, which detects the accelerator pedal position; and 5) the ECM (included in hybrid vehicle control ECU), which controls the ETCS. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.






MONITOR DESCRIPTION

The ECM (included in the hybrid vehicle control ECU) monitors the idling speed and idling air flow volume to conduct Idle Speed Control (ISC). The ECM determines that the ISC system is malfunctioning if the following conditions are met:

- The learned idling air flow volume remains at the maximum or minimum volume for 5 seconds during a drive cycle.
- After driving at 6.25 mph (10 km/h) or more, the actual engine idling speed varies from the target idling speed by between 100 rpm and 200 rpm, 5 times or more during a drive cycle.

Example:
If the actual idling speed varies from the target idling speed by more than 200 rpm* 5 times during a drive cycle, the ECM illuminates the MIL and sets the DTC.
HINT: *: Threshold idling speed varies with engine load.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





INSPECTION PROCEDURE
HINT:
- The following conditions may also cause DTC P0505 to be set:
1. The throttle valve is not fully closed. (e.g. The accelerator pedal is slightly depressed by something such as a floormat overlapping the accelerator pedal.)
- Read freeze frame data using the Techstream. The ECM (included in the hybrid vehicle control ECU) 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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the tester on.
(d) Select the following the menu items: Powertrain / Engine / Trouble Code.
(e) Read the DTCs.
Result:





HINT: If any DTCs other than P0505 are output, troubleshoot those DTCs first.

B -- GO TO DTC CHART
A -- Continue to next step.
2. CHECK PCV HOSE (HOSE CONNECTIONS)
OK:
PCV hose is connected correctly and is not damaged.
NG -- REPAIR OR REPLACE PCV HOSE
OK -- Continue to next step.
3. CHECK AIR INDUCTION SYSTEM
(a) Check the air induction system for vacuum leaks.
OK:
No leaks in air induction system.
NG -- REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK -- Continue to next step.
4. CHECK THROTTLE VALVE
(a) Check the throttle valve condition.
OK:
Throttle valve is not contaminated with carbon build-up or foreign objects and moves smoothly.
NG -- REPLACE THROTTLE BODY ASSEMBLY
OK -- REPLACE HYBRID VEHICLE CONTROL ECU