Fuel System > Engine Control System > P161B ECM Torque Calculation Performance

Component Location

General Description

Comparing actual torque and desired torque, PCM diagnoses calculated torque state. Actual torque keeps lower than desired torque, PCM checks if actual torque is higher than desired torque. deviding condition into two state, dynamic and steady states, PCM applies different diagnosis logic. Because the responses due to this code is similar to that of MAF control error, checking MAF at first.

DTC Description

If the actual torque is higher than the desired torque, an error is recognized. And PCM sets P161B and MIL(Malfunction Indication Lamp) turns on.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC Strategy

•	Determines if actual torque is grossly different from desired torque

•	Intake air leakage

•	Faulty ETS System

•	Clogged exhaust system

•	Faulty PCM

Enable Conditions

•	No faults present

•	Engine Running state

•	Engine Speed > 600rpm

•	Driving(idle to maximum speed)

Threshold value

•	Actual Torque > Desired Torque

DiagnosisTime

•	Continuous (Within 20sec.)

MIL On Condition

•	1 Driving Cycle

Monitor DTC Status

Check DTC Status

(1)	Connect scantool to Data Link Connector(DLC).

(2)

IG "ON".

(3)	Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.

(4)	Read "DTC Status" parameter.

(5)

Is parameter displayed "Present fault"?

	▶ Go to "Terminal and Connector inspection" procedure.
	▶ Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

Terminal And Connector Inspection

1.	Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.	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 " System Inspection " procedure.

System Inspection

■ Check air leakage

Check contamination or installation of Gasket

▶ Check throttle body gasket

▶ Check gasket between intake manifold and surge tank.

▶ Check contamination or clog by foreign material of gasket between intake manifold and injector.

▶ Check contamination or open stuck resulting from foreign material between surge tank and PCSV.

Is there any air leakage ?

	▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
	▶ Go to " Check exhaust system for clogging" as follows.

■ Check exhaust system for clogging

1.	Check exhaust system. ▶ Clogged or broken muffler ▶ Broken catalyst

Is the exhaust system colgged ?

	▶ Go to "Check throttle valve for stuck" as follows.
	▶ Repair or repalce as necessary and then, go to "Verification of Vehicle Repair" procedure.

■ Check throttle valve for stuck

IG "OFF".

2.	Remove air hose between throttle body and airflow sensor.

3.	Check if throttle valve is sutck by foreign material.

Is the throttle valve normal ?

	▶ Go to "Component Inspection" procedure.
	▶ After getting rid of foreign material, check that throttle valve is normal. And check for proper operation. If the problem is corrected,replace ETC and then go to "Verification of Vehicle Repair" procedure.

※ Procedure of ETS Initialization

A.	Erase the trouble codes on PCM

B.	Turn the ignition key off and keep this condition until the main relay is turned off.(It will take 10sec.)

C.	Turn ignition key on more than 1second to record the throttle motor position on the EEPROM

Component Inspection

■ Check resistance of ETS Motor

IG "OFF"

2.	Disconnect ETS motor & TPS connector.

Measure resistance between ETC motor(+) and (-) terminals of ETC Motor & TPS connector.(Component Side)

Specification : Approx. 1.275 ~ 1.725Ω@ 23°C(73.4 °F)

Is the measured resistance within specifications ?

	▶Substitute with a known-good PCM and check for proper operation. If the problem is corrected,replace PCM and then go to "Verification of Vehicle Repair" procedure.
	▶ Substitute with a known-good ETC and check for proper operation. If the problem is corrected,replace ETC and then go to "Verification of Vehicle Repair" procedure.

※ Procedure of ETS Initialization

A.	Erase the trouble codes on PCM

B.	Turn the ignition key off and keep this condition until the main relay is turned off.(It will take 10sec.)

C.	Turn ignition key on more than 1second to record the throttle motor position on the EEPROM

Verification Of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.

1.	Connect scantool and select "DTC" button.

2.	Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions

3.	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.