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4-68 FI SYSTEM DIAGNOSIS
Step 2
1) Turn the ignition switch OFF.
2) Disconnect the STVA lead wire coupler.
3) Check the continuity between each terminal and ground.
STVA continuity: ∞ Ω (Infinity)
(Terminal – Ground)
4) If OK, then measure the STVA resistance (between terminal
A and terminal B) and (between terminal C and terminal
D).
STVA resistance: Approx. 7.0 Ω
(
Terminal
A –
Terminal
B)
(
Terminal
C –
Terminal
D)
09900-25008: Multi-circuit tester set
Tester knob indication: Resistance (Ω)
Is the resistance OK?
5) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
2
2
YES
• W/B, P/W, G and B/Lg wire open or shorted to
ground, or poor
1
,
2
,
H
and
I
connection
• If wire and connection are OK, intermittent trou-
ble 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.
NO
• Loose or poor contacts on the ECM coupler.
• Replace the STVA with a new one.
When using the multi-circuit tester, do not storongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
2
(Black) (Gray)
ECM couplers (Harness side)