Dtc P0121 Throttle Position Circuit Range / Performance Problem - Suzuki Jimny Service Manual

DTC P0121 Throttle Position Circuit Range / Performance Problem

WIRING DIAGRAM
Refer to DTC P0120 section.
CIRCUIT DESCRIPTION
DTC DETECTING CONDITION
• After engine warmed up.
• 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) in 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 acci-
dent and be 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.
1) Turn ignition switch OFF. Clear DTC with ignition switch ON, check vehicle and environmental condition for :
– 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 °C, 158 °F or higher
2) Warm up engine to normal operating temperature.
3) Increase vehicle speed to 30 – 40 mph, 50 – 60 km/h in 3rd gear or "D" range and hold throttle valve at that
opening position for 1 min.
4) Stop vehicle.
5) Check DTC in "DTC" mode and pending DTC in "ON BOARD TEST" or "PENDING DTC" mode.
INSPECTION
Step
1 Was "Engine Diag. Flow Table" performed?
2 Is SUZUKI scan tool available?
3 Check TP Sensor and Its Circuit.
1) Turn ignition switch OFF and connect
SUZUKI scan tool to DLC. See Fig. 1.
2) Turn ignition switch ON and check TP sen-
sor output voltage when throttle valve is at
idle position and fully opened. See Fig. 3.
Dose voltage vary within specified value linearly
as shown in figure?
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-57
• TP sensor malfunction
• High resistance in the circuit
• ECM malfunction
Yes
Go to Step 2.
Go to Step 3.
Substitute a known-good
ECM and recheck.
POSSIBLE CAUSE
No
Go to "Engine Diag. Flow
Table".
Go to Step 4.
Go to Step 5.