1A-75 Engine General Information and Diagnosis:
2 1) Turn the ignition switch OFF.
2) Move the throttle body right side. Refer to “Throttle Body
Removal and Installation in Section 1D (Page 1D-9)”.
3) Disconnect the STVA lead wire coupler.
4) Check the continuity between each terminal and ground.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Resistance (Ω)
STVA continuity
∞ Ω (Infinity)
(Terminal – Ground)
5) If OK, then measure the STVA resistance (between the
B wire “A” and P wire “B”) and (between the G wire “C”
and W/Bl wire “D”).
STVA resistance
Approx. 7.0 Ω
(Terminal “A” – Ground “B”, Terminal “C” – Ground
“D”)
Is the resistance OK?
• W/B, P/W, G and B/
Lg wire open or
shorted to the
ground, or poor “1”,
“2”, “18” and “19”
connection.
• If wire and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspect it
again. Refer to “ECM
Removal and
Installation in Section
1C (Page 1C-1)”.
• Loose or poor
contacts on the ECM
coupler.
• Replace the STVA
with a new one. Refer
to “Throttle Body
Disassembly and
Assembly in Section
1D (Page 1D-10)”.
Step Action Yes No
(A)
I718H1110192-02
(A)
“A”
“B”
“C”
“D”
I718H1110193-02
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