Table of Contents
DTC P0121 Throttle Position Sensor Circuit Range/Performance
Wiring Diagram
1
E23
7
6
5
4
3
17
16
15
14
13
12
11
27
26
25
24
23
22
21
34
33
32
31
1. TP sensor
3. To other sensors
2. To MAP sensor
4. ECM
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
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)
DTC Confirmation Procedure
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent 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.
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION
PROCEDURE.
• Intake air temp.: –7°C, 19.4°F or higher
• Engine coolant temp.: 70°C, 158°F or higher
• Altitude (barometric pressure): 2500 m, 8200 ft or less (540 mmHg, 72 kPa or more)
WHT/GRN
BRN/WHT
E22
2
1
7
6
5
4
3
10
9
8
19
18
17
16
15
14
13
12
11
20
19
18
27
26
25
24
23
30
29
28
35
34
33
32
31
ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-81
2
E22-8
WHT/GRN
GRY
E22-34
E22-28
BRN/WHT
3
E21
2
1
6
5
4
3
2
10
9
8
16
15
14
13
12
11
10
9
8
22
21
20
27
26
25
24
23
22
21
20
19
30
29
28
35
34
33
32
31
30
• Air intake system
• TP sensor
• TP sensor circuit
• ECM
• MAF sensor
• Idle air control valve
4
1
7
18
17
29
28
Trouble Area
Table of Contents
