Page 569 of 2267
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
with CONSULT-II.
2) Start engine and maintain the following conditions for at least
5 consecutive seconds.
VHCL SPEED SE More than 4 km/h (2 MPH)
Selector lever Suitable position except ªNº position
3) If 1st trip DTC is detected, go to ªDiagnostic Procedureº, EC-
QG-129.
With GST
Follow the procedure ªWith CONSULT-IIº above.
PEF651U
DTC P0120 THROTTLE POSITION SENSORQG16I18DE
DTC Confirmation Procedure (Cont'd)
EC-127
Page 570 of 2267
Wiring DiagramNCEC0084
YEC064A
DTC P0120 THROTTLE POSITION SENSORQG16I18DE
Wiring Diagram
EC-128
Page 571 of 2267
Diagnostic ProcedureNCEC0085
1 RETIGHTEN GROUND SCREWS
1. Turn ignition switch ªOFFº.
2. Loosen and retighten engine ground screws.
SEF994W
©GO TO 2.
2 CHECK POWER SUPPLY
1. Disconnect throttle position sensor harness connector.
NEF246A2. Turn ignition switch ªONº.
3. Check voltage between terminal 3 and ground with CONSULT-II or tester.
SEF209WVoltage: Approximately 5V
OK or NG
OK©GO TO 3.
NG©Repair harness or connectors.
Throttle bodyThrottle position sensor
harness connector
IACV-AAC valve
harness connector
DTC P0120 THROTTLE POSITION SENSORQG16I18DE
Diagnostic Procedure
EC-129
Page 572 of 2267

3 CHECK GROUND CIRCUIT
1. Turn ignition switch ªOFFº.
2. Check harness continuity between throttle position sensor harness connector terminal 1 and engine ground.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 5.
NG©GO TO 4.
4 DETECT MALFUNCTIONING PART
Check the harness for open or short between ECM and throttle position sensor.
©Repair open circuit or short to ground or short to power in harness or connectors.
5 CHECK INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 92 and throttle position sensor harness connector terminal 2.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 6.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
6 CHECK THROTTLE POSITION SENSOR
Refer to ªComponent Inspectionº, EC-QG-131.
OK or NG
OK©GO TO 7.
NG©Replace throttle position sensor. To adjust it, perform ªBasic Inspectionº, EC-QG-72.
7 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-QG-102.
©INSPECTION END
DTC P0120 THROTTLE POSITION SENSORQG16I18DE
Diagnostic Procedure (Cont'd)
EC-130
Page 573 of 2267

Component InspectionNCEC0086THROTTLE POSITION SENSORNCEC0086S01With CONSULT-II
1) Stop engine (ignition switch OFF).
2) Turn ignition switch ON.
3) Select ªDATA MONITORº mode with CONSULT-II.
4) Check voltage of ªTHRTL POS SENº under the following con-
ditions.
NOTE:
Voltage measurement must be made with throttle position
sensor installed in vehicle.
Throttle valve conditions Voltage (V)
Completely closed 0.35 - 0.65 (a)
Partially open Between (a) and (b)
Completely open 3.7 - 4.5 (b)
If NG, adjust throttle position sensor idle position. Refer to
ªBasic Inspectionº, EC-QG-72.
5) If it is impossible to adjust throttle position sensor idle position
in ªBasic Inspectionº, replace throttle position sensor.
Without CONSULT-II
1) Stop engine (ignition switch OFF).
2) Turn ignition switch ON.
3) Check voltage between ECM terminal 92 (Throttle position
sensor signal) and ground under the following conditions.
NOTE:
Voltage measurement must be made with throttle position
sensor installed in vehicle.
Throttle valve conditions Voltage (V)
Completely closed 0.35 - 0.65 (a)
Partially open Between (a) and (b)
Completely open 3.7 - 4.5 (b)
If NG, adjust throttle position sensor idle position. Refer to
ªBasic Inspectionº, EC-QG-72.
4) If it is impossible to adjust throttle position sensor idle position
in ªBasic Inspectionº, replace throttle position sensor.
NEF069A
SEF007X
DTC P0120 THROTTLE POSITION SENSORQG16I18DE
Component Inspection
EC-131
Page 574 of 2267

Component DescriptionNLEC0094The heated oxygen sensor 1 (front) is placed into the exhaust
manifold. It detects the amount of oxygen in the exhaust gas com-
pared to the outside air. The heated oxygen sensor 1 (front) has a
closed-end tube made of ceramic zirconia. The zirconia generates
voltage from approximately 1V in richer conditions to 0V in leaner
conditions. The heated oxygen sensor 1 (front) signal is sent to the
ECM. The ECM adjusts the injection pulse duration to achieve the
ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical
change from 1V to 0V.
CONSULT-II Reference Value in Data Monitor
Mode
NLEC0095Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 (B1)
IEngine: After warming upMaintaining engine speed at 2,000
rpm0 - 0.3V+,Approx. 0.6 - 1.0V
HO2S1 MNTR
(B1)LEAN+,RICH
Changes more than 5 times during
10 seconds.
ECM Terminals and Reference ValueNLEC0096Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
62 RHeated oxygen sensor
1 (front)[Engine is running]
IAfter warming up to normal operating tempera-
ture and engine speed is 2,000 rpm0 - Approximately 1.0V
SEF008W
SEF463R
SEF288D
DTC P0130 HEATED OXYGEN SENSOR 1 (FRONT)
(CIRCUIT)QG16I18DE
Component Description
EC-132
Page 575 of 2267

On Board Diagnosis LogicNLEC0097Under the condition in which the heated oxygen sensor 1 (front)
signal is not input, the ECM circuits will read a continuous approxi-
mately 0.3V. Therefore, for this diagnosis, the time that output
voltage is within 200 to 400 mV range is monitored, and the diag-
nosis checks that this time is not inordinately long.
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0130
0130IThe voltage from the sensor is constantly approx. 0.3V.IHarness or connectors
(The sensor circuit is open or shorted.)
IHeated oxygen sensor 1 (front)
DTC Confirmation ProcedureNLEC0098CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test.
TESTING CONDITION:
IBefore performing the following procedure, confirm that
battery voltage is more than 11V at idle.
With CONSULT-II
1) Start engine and warm it up to normal operating temperature.
2) Select ªHO2S1 (B1) P0130º of ªHO2S1 (B1)º in ªDTC WORK
SUPPORTº mode with CONSULT-II.
3) Touch ªSTARTº.
4) Let it idle for at least 3 minutes.
NOTE:
Never raise engine speed above 3,200 rpm after this step. If
the engine speed limit is exceeded, return to step 4.
5) When the following conditions are met, ªTESTINGº will be dis-
played on the CONSULT-II screen. Maintain the conditions
continuously until ªTESTINGº changes to ªCOMPLETEDº. (It
will take approximately 10 to 60 seconds.)
ENG SPEED 1,700 - 3,200 rpm
Vehicle speed Above 64 km/h (40 MPH)
B/FUEL SCHDL Above 3.0 msec
Selector lever Suitable position
If ªTESTINGº is not displayed after 5 minutes, retry from
step 2.
6) Make sure that ªOKº is displayed after touching ªSELF-DIAG
SEF237U
SEF825Y
SEF826
SEF645Y
DTC P0130 HEATED OXYGEN SENSOR 1 (FRONT)
(CIRCUIT)QG16I18DE
On Board Diagnosis Logic
EC-133
Page 576 of 2267
RESULTSº. If ªNGº is displayed, refer to ªDiagnostic Procedureº,
EC-QG-136.
Overall Function CheckNLEC0099Use this procedure to check the overall function of the heated oxy-
gen sensor 1 (front) circuit. During this check, a 1st trip DTC might
not be confirmed.
Without CONSULT-II
1) Start engine and warm it up to normal operating temperature.
2) Set voltmeter probes between ECM terminal 62 (HO2S1 sig-
nal) and engine ground.
3) Check the following with engine speed held at 2,000 rpm con-
stant under no load.
IThe voltage does not remain in the range of 0.2 - 0.4V.
4) If NG, go to ªDiagnostic Procedureº, EC-QG-136.
SEF011X
DTC P0130 HEATED OXYGEN SENSOR 1 (FRONT)
(CIRCUIT)QG16I18DE
Overall Function Check
EC-134