6-68 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)
TROUBLESHOOTING
Step Action Yes No
1Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag. Flow
Ta bl e ”.
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%?
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection” in
Section 0A.
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 “GRY/RED” wire, “RED/
GRN” wire and “GRY/YEL” wire.
3) If OK, then with ignition switch ON, check
voltage between “GRY/RED” wire, and
“GRY/YEL” wire terminals at connector.
Is voltage about 4 – 6 V?
Go to Step 4. “GRY/RED” wire open,
“GRY/RED” wire shorted
to ground circuit/power
circuit, “GRY/YEL” wire
open, poor C51-3-21 con-
nection, or poor C51-3-13
connection.
If wire and connection are
OK, substitute a known-
good ECM (PCM) and
recheck.
4 Check TP Sensor.
1) Check resistance between terminals of TP
sensor referring to “TP Sensor” in Section
6E1.
Are measured values within specifications?
“RED/GRN” wire open/
shorted to ground, “RED/
GRN” wire shorted to
power circuit, or poor
C51-3-9 connection.
If OK, substitute a known-
good ECM (PCM) and
recheck.
Replace TP sensor.
To Next Page
Loading...
