1.CHECK HARNESS BETWEEN ECM AND OIL FLOW CONTROL SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and oil flow control solenoid valve.
3) Measure the voltage between ECM and chassis ground.
Connector & terminal
(B137) No. 15 (+) — Chassis ground (−):
(B137) No. 14 (+) — Chassis ground (−):
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Is the voltage less than 1 V?
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Repair the short circuit of harness to power supply between ECM and oil flow control solenoid valve connector.
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2.CHECK HARNESS BETWEEN ECM AND OIL FLOW CONTROL SOLENOID VALVE.
Measure the resistance of harness between ECM and oil flow control solenoid valve connector.
Connector & terminal
(B137) No. 15 — (E37) No. 1:
(B137) No. 14 — (E37) 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 and oil flow control solenoid valve connector
• Poor contact in coupling connector
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3.CHECK OIL FLOW CONTROL SOLENOID VALVE.
Measure the resistance between oil flow control solenoid valve terminals.
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Is the resistance between 6 — 12 Ω?
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Repair the poor contact of ECM and oil flow control solenoid valve connector.
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Replace the oil flow control solenoid valve. 
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