Suzuki Engine 2002 GRAND VITARA SQ625, Руководство по обслуживанию

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6-70 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)
TROUBLESHOOTING (DTC P0121)
Fig. for Step 4 and 5
Step Action Yes No
1 Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag.
Flow Table”.
2 Is there a DTC related to TP sensor (DTC P0120)? Go to applicable DTC
Diag. Flow Table. Go to Step 3.
3 Is SUZUKI scan tool available? Go to Step 4. Go to Step 5.
4 Check TP Sensor and its Circuit.
1) Turn ignition switch OFF and connect SUZUKI
scan tool to DLC.
2) Turn ignition switch ON and check TP sensor out-
put voltage when throttle valve is at idle position
and fully opened.
Does voltage vary within specified value linearly as
shown in figure?
If voltmeter was used,
check terminal C51-3-9
for poor connection.
If OK, substitute a known-
good ECM (PCM) and
recheck. Go to Step 6.
5 Check TP Sensor and Its Circuit.
1) Turn ignition switch ON.
2) Check voltage at terminal C51-3-9 of ECM (PCM)
connector connected, when throttle valve is at idle
position and fully opened.
Dose voltage vary within specified value linearly as
shown in figure?
It voltmeter was used,
check terminal C51-3-9
for poor connection.
If OK, substitute a known-
good ECM (PCM) and
recheck. Go to Step 6.
6 Check TP Sensor.
1) Turn ignition switch OFF.
2) Disconnect TP sensor connector.
3) Check for proper connection to TP sensor at each
terminal.
4) If OK, check TP sensor for resistance referring to
“TP sensor” in Section 6E1.
Is check result satisfactory?
High resistance in “GRY/
RED”, “RED/GRN” or
“GRY/YEL” circuit.
If wire and connection are
OK, substitute a known-
good ECM (PCM) and
recheck. Replace TP sensor.