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DTC P0121: Throttle Position Circuit Range / Performance Problem
Wiring Diagram
DTC Detecting Condition and Possible Cause
DTC will set when the following conditions are detected.
• After engine warmed up.
• While vehicle running at specified engine speed.
• No change in intake manifold pressure (constant throttle opening)
• Difference between actual throttle opening (detected from TP sensor) and
opening calculated by ECM (obtained on the basis of engine speed and
intake manifold pressure) is larger than specified value.
*2 driving cycle detection logic, continuous monitoring
DTC Confirmation Procedure
WARNING
!
• When performing a road test, select a
place where there is no traffic or
possibility of a traffic accident and very
careful during testing to avoid occurrence
of an accident.
• Road test should be carried out with 2
persons, a driver and a tester, on a level
road.
C41 (31P)
9
8
7
6
5
4
3
2
1
21
20
19
18
17
16
15
14
13
12
11
10
31
30
29
28 27
26
25
24
23
22
1. To MAP sensor and CO adjust resistor (if equipped)
2. From other sensors
DTC detecting condition
Engine General Information and Diagnosis:
1
GRY/RED
GRY/BLU
ORN
2
G04 (24P)
7
6
5
4
3
2
1
6
16
15
14
13 12
11
10
9
8
12
24
23
22
21
20
19
18
17
17
NOTE
Check to make sure that the following
conditions are satisfied when using this DTC
confirmation procedure.
• Altitude (barometric pressure): 2400 m,
8000 ft or less (560 mmHg, 75 kPa or more)
• Ambient temp.: –10 °C, 14 °F or higher
• Intake air temp.: 70 °C, 158 °F or lower
• Engine coolant temp.: 70 – 110 °C, 158 –
230 °F
1) Turn ignition switch OFF. Clear DTC with ignition
switch ON.
2) Warm up engine to normal operating temperature.
3) Increase vehicle speed to 50 – 60 km/h, 30 – 40 mph
in 3rd gear or "D" range and hold throttle valve at
that opening position for 1 min.
4) Stop vehicle.
5) Check DTC and pending DTC.
ECM
5V
5V
C41-22
C41-16
C41-10
G03 (17P)
5
4
3
2
1
11
10
9
8
7
16
15
14
13
Possible cause
• TP sensor malfunction
• High resistance in the circuit
• ECM malfunction
1A-54
S3RH0A1104024
I2RH0B110026-01
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