6-2-86 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
2 Check TP sensor and its circuit.
1) Connect scan tool to DLC with ignition
switch turned OFF and then turn ON ignition
switch.
2) Check throttle valve opening percentage dis-
played on scan tool.
3) Check throttle valve opening percentage dis-
played on scan tool while opening throttle
valve from idle position to full open position.
Is it displayed 0%?
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection” in Section 0A.
3 Check wire harness.
1) Disconnect connector from TP sensor with
ignition switch turned OFF.
2) Check for proper connection to TP sensor at
“WHT/GRN”, “GRY” and “BRN/WHT” wire
terminals.
3) If OK, then with ignition switch turned ON,
check for the following terminal voltages.
• Between “WHT/GRN” terminal of TP sensor
connector and body ground
• Between “GRY” terminal of TP sensor con-
nector and body ground (See Fig. 1)
Is each terminal voltage about 4 – 6 V?
Go to Step 5. Go to Step 4.
4 Check ECM voltage.
1) Check for proper connection of ECM con-
nector at “E22-8” and “E22-34” wire termi-
nals.
2) If OK, disconnect connector from MAP sen-
sor.
3) Turn ignition switch to ON position.
4) Check for the following terminal voltages.
• Between “E22-8” terminal of ECM connector
and body ground
• Between “E22-34” terminal of ECM connec-
tor and body ground
Is each terminal voltage about 4 – 6 V?
Check MAP sensor refer-
ring to “Manifold Absolute
Pressure Sensor (MAP
Sensor) Inspection” in
Section 6E2.
If they are OK, go to Step
5.
Go to Step 5.
5 Check wire circuit.
1) Disconnect connectors from ECM with igni-
tion switch turn OFF.
2) Check that there is insulation between
“WHT/GRN” wire terminal of TP sensor con-
nector and body ground and between “GRY”
wire terminal of TP sensor connector and
body ground.
Is there insulation?
Go to Step 6. “WHT/GRN” and/or
“GRY” wire shorted to
ground circuit.
If wires are OK, substitute
a known-good ECM and
recheck.
Step Action Yes No
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