1.CHECK POOR CONTACT.
Check for poor contact in the ECM connector and the suction control valve connector.
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Is there poor contact in ECM connector or suction control valve connector?
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Repair the poor contact of ECM connector or suction control valve connector.
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2.CHECK HARNESS BETWEEN ECM AND SUCTION CONTROL VALVE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and suction control valve.
3) Measure the resistance of harness between ECM connector and suction control valve connector.
Connector & terminal
(B134) No. 5 — (E123) No. 1:
(B134) No. 26 — (E123) No. 2:
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Is the resistance less than 1 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit of harness between ECM connector and suction control valve connector
• Poor contact in coupling connector
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3.CHECK HARNESS BETWEEN ECM AND SUCTION CONTROL VALVE CONNECTOR.
Measure the resistance between suction control valve connector and engine ground.
Connector & terminal
(E123) No. 1 — Engine ground:
(E123) No. 2 — Engine ground:
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Is the resistance 1 MΩ or more?
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Repair the short circuit to ground in harness between ECM connector and suction control valve connector.
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4.CHECK SUCTION CONTROL VALVE.
Measure the resistance between suction control valve terminals.
NOTE:
Measure the resistance when suction control valve temperature is 20°C (68°F).
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Is the resistance 1.8 — 2.4 Ω?
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The circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE:
In this case, temporary poor contact of connector may be the cause.
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Replace the suction control valve. 
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