1A-74 Engine General Information and Diagnosis:
2 1) Turn the ignition switch OFF.
2) Disconnect the STVA lead wire coupler.
3) Check the continuity between each terminal and ground.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Resistance (:)
STVA continuity
f: (Infinity)
(Terminal – Ground)
4) 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. 6.5 :
(Terminal “A” – Terminal “B”, Terminal “C” –
Terminal “D”)
Is the resistance OK?
• B/Lg, P/W, W/B and
Y/W wire open or
shorted to the
ground, or poor “19”,
“2”, “18” and “1”
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-2)”.
• Loose or poor
contacts on the ECM
coupler.
• Replace the throttle
body assembly with a
new one. Refer to
“Throttle Body
Disassembly and
Assembly in Section
1D (Page 1D-12)”.
Step Action Yes No
(A)
I823H1110131-01
(A)
“A”
“C”
“D”
“B”
I823H1110132-01
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