P161B
P161BComponent 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. dividing 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:
Monitor DTC Status
1. Check DTC Status
1. Connect scantool to Data Link Connector(DLC).
2. IG "ON".
3. Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F5(INFO) to check DTC's information from the DTCs menu
4. Read "DTC Status" parameter.
5. Is parameter displayed "Present fault"?
YES
a. Go to "Terminal and Connector inspection" procedure.
NO
a. 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 terminal condition. 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.
3. Has a problem been found?
YES
a. Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
a. Go to "System Inspection" procedure.
System Inspection
1. Check air leakage
1. Check for contamination or installation of Gasket
- Check throttle body gasket
- Check gasket between intake manifold and surge tank.
- Check for contamination or clog by foreign material of gasket between intake manifold and injector.
- Check for contamination or sticking condition resulting from foreign material between surge tank and PCSV.
2. Is there any air leakage ?
YES - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
NO - Go to "Check exhaust system for clogging" as follows.
2. Check exhaust system for clogging
1. Check exhaust system.
- Clogged or broken muffler
- Broken catalyst
2. Is the exhaust system clogged ?
YES
a. Go to "Check throttle valve for stuck" as follows.
NO
a. Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
3. Check throttle valve for stuck
1. IG "OFF".
2. Remove air hose between throttle body and airflow sensor.
3. Check if throttle valve is stuck by foreign material.
4. Is the throttle valve normal ?
YES
a. Go to "Component Inspection" procedure.
NO
a. 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
1. Erase the trouble codes on PCM
2. Turn the ignition key off and keep this condition until the main relay is turned off.(It will take 10 sec.)
3. Turn ignition key on more than 1 second to record the throttle motor position on the EEPROM
Component Inspection
1. Check resistance of ETS Motor
1. IG "OFF"
2. Disconnect ETS motor & TPS connector.
3. Measure resistance between terminal 5 and 8 of ETS motor & TPS connector.(Component Side)
Specification : Approx. 1.275 - 1.725 ohms @ 23 °C (73.4 °F)
4. Is the measured resistance within specifications ?
YES
a. 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.
NO
a. 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
1. Erase the trouble codes on PCM
2. Turn the ignition key off and maintain this condition until the main relay is turned off.(It will take 10 sec.)
3. Turn ignition key on more than 1 second 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 scan tool and select "Diagnostic Trouble Codes(DTCs)" mode
2. Press F5(INFO) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
3. Read "DTC Status" parameter
4. Is parameter displayed "History(Not Present) fault"?
YES - System performing to specification at this time. Clear the DTC.
NO - Go to the applicable troubleshooting procedure.