Suzuki Liana RH413, Service Manual

Page: 105 / 1302

Engine General Information and Diagnosis: 1A-54
DTC P0121: Throttle Position Circuit Range / Performance Problem
S3RH0A1104024
Wiring Diagram
DTC Detecting Condition and Possible Cause
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.
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.
C41-10
C41-22
C41-16
5V 5V
ECM
GRY/RED
GRY/BLU
ORN
C41 (31P) G04 (24P) G03 (17P)
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 28 27 29 30 31
5 6 1 2 3 4 5 6 7
11 12 9 10 11 13 12 14 15 16
16 17
1 2
7 8
13 14
3 4
9 10
15
17 18
8
19 20 21 22 23 24
1
2
I2RH0B110026-01
1. To MAP sensor and CO adjust resistor (if equipped)
2. From other sensors
DTC detecting condition 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
• TP sensor malfunction
• High resistance in the circuit
• ECM malfunction