DESCRIPTION The idle speed
is controlled by the Electronic Throttle Control System (ETCS). The ETCS
is comprised of a throttle actuator, which operates the throttle valve,
and a throttle position sensor, which detects the opening amount of the
throttle valve. The ECM controls the throttle actuator to adjust the
throttle valve opening amount so that the idle speed is maintained at
the target idle speed. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Memory |
Note | | P210900 |
Throttle/Pedal Position Sensor "A" Minimum Stop Performance |
The
ISC learned value is approximately 3 times larger than normal even
though the actual intake air amount during idle is within the normal
range (up to 1.5 times the normal amount) (1 trip detection logic). |
Throttle body with motor assembly |
Does not come on | DTC stored |
SAE Code: P2109 |
HINT:
- The ISC learned value is the calculated intake air amount corresponding
to the throttle opening amount necessary to maintain the idling speed.
- This malfunction is only detected once per trip. After it has been
detected once, the system will not monitor for the malfunction for the
rest of the trip.
- The system uses the throttle body with motor assembly and mass air flow meter sub-assembly to detect this malfunction.
MONITOR DESCRIPTION If
there are deposits in the throttle valve, a decrease in the ISC flow
rate may cause engine stall or unstable idling. Therefore, the necessary
ISC flow rate for idling is maintained using the ISC learned value and
feedback. The ECM stores this DTC if the ISC learned value approaches
its limit. The ECM begins monitoring for the DTC detection conditions
when the following preconditions are met:
- The mass air flow meter sub-assembly is normal.
- Atmospheric pressure is 85 kPa(abs) [12.3 psi(abs)] or higher.
- The vehicle has been driven at a speed of 30 km/h (19 mph) or more at least once.
- The engine coolant temperature is 45°C (113°F) or less at engine start,
the engine is warmed up and conditions for ISC learning are met, or the
power switch has been turned on (IG) (include engine running) for 1 hour
or more, the engine is warmed up and conditions for ISC learning are
met.
CAUTION / NOTICE / HINT
NOTICE:
HINT:
- Since a pending DTC is not stored for this DTC, it takes time to confirm
whether the malfunction has been successfully repaired by checking for
this DTC. When confirming whether the malfunction has been successfully
repaired, compare "ISC Learning Value" recorded in the Freeze Frame Data
with "ISC Learning Value" in the Data List after repairs have been made
to save time.
- Read Freeze Frame Data using the Techstream. 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 |
1. | CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P210900) |
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG).
(c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs. Powertrain > Engine > Trouble Codes
|
Result | Proceed to | |
DTC P210900 is output |
A | | DTC P210900 and other DTCs are output |
B | HINT: If any DTCs other than P210900 are output, troubleshoot those DTCs first.
| B |
 | GO TO DTC CHART |
|
A |
 | |
| 2. |
READ FREEZE FRAME DATA (ISC LEARNING VALUE) |
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG).
(c) Turn the Techstream on. (d) Using the Techstream, check "ISC Learning Value" in the Freeze Frame Data. Powertrain > Engine > DTC(P210900) > Freeze Frame Data
|
Tester Display | | ISC Learning Value |
HINT: Be
sure to confirm that the Freeze Frame Data item "ISC Learning Value" is
the same as that used when confirming whether the malfunction has been
successfully repaired.
|
NEXT | |
| |
| 3. |
INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY |
(a) Check for foreign matter between the throttle valve and the housing.
|
*1 | Throttle Body with Motor Assembly |
*2 | Bore | |
*3 | Throttle Valve |
- | - | |
*a | Reference |
*b | Throttle Body with Motor Assembly Cross-section Diagram | |
*c | When valve fully opened |
*d | Deposits |
HINT: The illustration is for reference only, actual parts may differ.
|
Result | Proceed to | |
Foreign matter between the throttle valve and housing |
A | | No foreign matter between the throttle valve and housing |
B | HINT: Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
Click here 
| B |
| REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY |
|
A | |
| |
| 4. |
REMOVE FOREIGN MATTER (CLEAN THROTTLE BODY WITH MOTOR ASSEMBLY) |
(a) Clean off any deposits inside of the throttle body with motor assembly.
|
*1 | Throttle Body with Motor Assembly |
*2 | Bore | |
*3 | Throttle Valve |
- | - | |
*a | Reference |
*b | Throttle Body with Motor Assembly Cross-section Diagram | |
*c | When valve fully opened |
*d | Do not directly apply cleaner | |
*e | Deposits |
- | - |
(1) Push open the throttle valve and wipe off any deposits from the valve and bore using a cloth soaked in non-residue solvent.
NOTICE:
- Make sure that the cloth or your fingers do not get caught in the valve.
- Make sure that foreign matter does not enter the throttle valve.
- Do not directly apply non-residue solvent to the throttle body with
motor assembly or wash the throttle body with motor assembly. Cleaning
solvent may leak into the motor from the shaft and cause problems such
as rust or valve movement problems.
- If there is coating material on the edge of the throttle valve, be careful not to remove it.
- Push the throttle valve open gently with your finger and check that the throttle valve moves smoothly.
HINT:
- If the throttle valve does not open smoothly, replace the throttle body with motor assembly.
Click here
- The illustration is for reference only, actual parts may differ.
|
NEXT | |
| |
| 5. |
READ VALUE USING TECHSTREAM (ISC LEARNING VALUE) |
(a) Perform "Inspection After Repair" after cleaning the throttle body with motor assembly.
Click here (b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Powertrain / Engine / Data List / ISC Learning Value. Powertrain > Engine > Data List
|
Tester Display | | ISC Learning Value |
(f) According to the display on the Techstream, read the Data List. OK:
The value of ISC Learning Value is half or less of ISC Learning Value recorded in the Freeze Frame Data.
HINT: Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
Click here
| OK |
| END |
| NG |
| REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY | | 
