The Electronic Throttle
Control(ETC) system is made of the components throttle body, Throttle
Position Sensor(TPS)1&2 and Accelerator Position Sensor(APS) 1&2.
TPS1&2 are sharing the same source voltage and ground.The throttle
valve opening is control by throttle motor which is controlled by Engine
Control Module(PCM).The opposite position indicator shows inverted signal
characteristics.TPS1 output voltage increases smoothly in proportion with
the throttle valve opening angle after starting. TPS2 output voltage
decreases in inverse proportion with the throttle valve opening angle
after starting. TPS provides feedback to the PCM to control the throttle
motor in order to control the throttle valve opening angle properly in
response to the driving condition.
Checking output signals
from TPS 1 and 2, under detecting condition, if output signals difference
between TPS1 and TPS2 are detected more than 4.5% for the specified number
of times., PCM sets P2135. MIL(Malfunction Indication Lamp) turns
on.
Item
|
Detecting
Condition
|
Possible Cause
|
DTC
Strategy
|
| •
|
Determines if TPS # 1 disagrees with TPS
# 2 | |
| •
|
Open or short in TPS
circuit |
|
Enable
condition
|
|
threshold
value
|
| •
|
Difference between average values of
TPS1 and TPS2 > 4.5% | |
diagnosis
time
|
|
MIL ON
condition
|
|
Throttle opening ( ° )
|
Output voltage(V) [Vref=5.0V]
|
TPS1
|
TPS2
|
0°
|
0.0V
|
5.0V
|
10°
|
0.5V
|
4.5V
|
20°
|
0.9V
|
4.1V
|
30°
|
1.4V
|
3.6V
|
40°
|
1.8V
|
3.2V
|
50°
|
2.3V
|
2.7V
|
60°
|
2.7V
|
2.3V
|
70°
|
3.2V
|
1.8V
|
80°
|
3.6V
|
1.4V
|
90°
|
4.1V
|
0.9V
|
100°
|
4.5V
|
0.5V
|
110°
|
5.0V
|
0.0V
|
| 1. |
Check DTC Status
| (1) |
Connect scantool to Data Link
Connector(DLC). |
| (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 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?
|
|
▶ Repair as
necessary and go to "Verification of Vehicle Repair"
procedure
|
|
|
▶ Go to
"Power Circuit Inspection "
procedure.
|
|
■ Check voltage
| 1. |
IG "OFF" and disconnect ETC Motor & TPS
connector. |
| 3. |
Measure voltage between TPS1(2) power terminal
of ETC Motor & TPS harness connector and chassis
ground.
Specification
: Approx. 5V
| |
| 4. |
Is the measured voltage within specification
?
|
|
▶ Go to
"Signal Circuit Inspection" procedure.
|
|
|
▶ Repair or
replace as necessary and then, go to "Verification of Vehicle
Repair"
procedure.
|
|
| Signal Circuit
Inspection |
■ Check short in harness
| 1. |
IG "OFF" and disconnect ETC Motor & TPS
connector and PCM connector. |
| 2. |
Measure resistance between TPS1 signal and
TPS2 signal terminals of ETC Motor & TPS harness
connector.
|
| 3. |
Is the measured resistance within
specification ?
|
|
▶ Go to
"Component Inspection" procedure.
|
|
|
▶ Repair or
replace as necessary and then, go to "Verification of Vehicle
Repair"
procedure.
|
|
| 1. |
Check TPS
| (1) |
Ignition "ON" & ENG
"OFF". |
| (2) |
Monitor signal waveform of TPS by
stepping on and off the accelerator padel on
scantool
Specification :
Throttle opening ( ° )
|
Output voltage(V)
[Vref=5.0V]
|
TPS1
|
TPS2
|
0°
|
0.0V
|
5.0V
|
10°
|
0.5V
|
4.5V
|
20°
|
0.9V
|
4.1V
|
30°
|
1.4V
|
3.6V
|
40°
|
1.8V
|
3.2V
|
50°
|
2.3V
|
2.7V
|
60°
|
2.7V
|
2.3V
|
70°
|
3.2V
|
1.8V
|
80°
|
3.6V
|
1.4V
|
90°
|
4.1V
|
0.9V
|
100°
|
4.5V
|
0.5V
|
110°
|
5.0V
|
0.0V
|
|
| (3) |
Is the measured signal waveform O.K
?
|
|
▶
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.
|
There is a memory reset
function on scantool that can erase optional parts
automaticallydetected and memorized by
PCM.
Before or after testing PCM
on the vehicle, use this function before reusing
the PC | |
|
|
▶
Substitute with a known-good TPS and check for proper
operation. If the problem is corrected,replace TPS and
then go to "Verification of Vehicle Repair"
procedure.
(After replacing
ETC, do initialization of ETC as
follows)
|
| |
※ 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.(10
sec.) |
| 3. |
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 |
| 4. |
Is parameter displayed "History(Not Present)
fault"?
|
|
▶ System
performing to specification at this time. Clear the
DTC
|
|
|
▶ Go to the
applicable troubleshooting
procedure.
|
|
