3.
Monitor "TPS1, TPS2" items on Current Data
ETC(Electronic Throttle Control Valve) is the device controlling amount of air to engine acccording to driver's intension. Different from the existing mechanical throttle valve which is composed of accelerator pecal and connecting wire cable, ETC consists of a motor, a throttle body and a throttle position sensor. Receiving input signals from electronic accelerator pedal module, PCM lets ETC motor control throttle valve. With ETC, cruise control system works without any additional device.
Checking the voltage from sensor power supply every 1.87 sec. under detecting condition, if the value within detecting condition lasts for more than 0.2 sec., PCM sets P0641. MIL(Malfunction Indicatin Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Sensor reference voltage check | ● Short in sensor power supply line ● Faulty PCM |
Enable Conditions | ● IG "ON" | |
Threshold value | ● Sensor supply power〈 4.5V or 〉5.5V | |
Diagnosis Time | ● Continuous (More than 0.2 seconds failure for every 1.87 seconds test ) | |
MIL On Condition | ● 2 driving cycle |
Ignition "OFF".
Connect Scantool and Engine "ON".
Monitor "TPS1, TPS2" items on Current Data
Are those related current data displayed correctly ?
▶ Fault is intermittent caused by poor contact in Sensor’s and/or PCM’s connector or was repairedand PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection,bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and goto "Verification of Vehicle Repair" procedure.
▶ Go to "Terminal and Connector Inspection" procedure.
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.
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 " Power Circuit Inspection " procedure.
Check voltage
IG "OFF".
Disconnect TPS connector.
IG "ON" and ENG "OFF"
Measure the voltage between terminal 4 of TPS harness connector and chassis ground.
Specification : Approx. 5V
Is the measured voltage within specification ?
▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to "Check short in power harness" as follows.
Check short in power harness
IG "OFF".
Disconnect TPS connector and PCM connector.
Measure the resistance between terminal 4 and 2 of TPS harness connector.
Measure the resistance between terminal 4 and 3 of TPS harness connector.
Measure the resistance between terminal 4 and 5 of TPS harness connector.
Measure the resistance between terminal 4 and 8 of TPS harness connector.
Specification : Infinite
Is the measured resistance within specification ?
▶ Substitute with a known - good PCM and check for proper operation.
▶ If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
▶ Repair Short in power circuit and 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 takes 10 second)
3. Turn ignition key on more than 1second to record the throttle motor position on the EEPROM
After a repair, it is essential to verify that the fault has been corrected.
Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
Using a Scantool, Clear the DTCs
Operate the vehicle within conditions noted in the freeze frame data or enable conditions
Monitor that all rediness test have been verified as " Complete "
Are any DTCs present ?
▶ Go to the applicable troubleshoooting procedure.
▶ System is performing to specification at this time.
