Suzuki 2000 Grand Vitara SQ625 Service Manual page 56

6-52 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check TP Sensor and Its Circuit.
1) Connect scan tool to DLC with ignition switch
OFF and then turn ignition switch ON.
2) Check throttle valve opening percentage
displayed on scan tool while opening throttle
valve from idle position to full open position.
Is it displayed 0% or 100%?
3 Check Wire Harness.
1) Disconnect connector from TP sensor with
ignition switch OFF.
2) Check for proper connection to TP sensor at
each terminals C30-3 and C30-2.
3) If OK, then with ignition switch ON, check
voltage between C30-3, and C30-1
terminals at connector.
Is voltage about 4 – 6 V?
4 Check TP Sensor.
1) Check resistance between terminals of TP
sensor referring to "TP Sensor Inspection"
in Section 6E1.
Are measured values within specifications?
ACTION YES
Go to Step 2.
Go to Step 3.
Go to Step 4.
"R /G" wire open/
shorted to ground,
"R /G" wire shorted to
power circuit, or poor
C51-3-9 connection.
If OK, substitute a
known-good ECM
(PCM) and recheck.
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Intermittent trouble.
Check for intermittent
referring to "Intermit-
tent and Poor Connec-
tion" in Section 0A.
"Gr/R" wire open,
"Gr/R" wire shorted to
ground circuit/power
circuit, "Gr/Y" wire
open, poor C51-3-21
connection, or poor
C51-3-13 connection.
If wire and connection
are OK, substitute a
known-good ECM
(PCM) and recheck.
Replace TP sensor.