1.CHECK INSTALLATION CONDITION OF BATTERY.
Turn the ignition switch to OFF.
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Are the positive and negative terminals of battery securely tightened?
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Tighten the positive and negative terminals of battery securely.
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2.CHECK BATTERY TERMINAL.
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Is there any connection of electrical parts to the positive and negative terminals of battery?
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Remove the wirings of electrical parts connected to the positive and negative terminals of battery.
NOTE:
Directly connecting electrical parts to the battery may cause erroneous operation of the battery current sensor.
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3.CHECK INSTALLATION CONDITION OF V-BELT.
Check the installation condition of V-belt. 
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Is the V-belt installed properly?
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Install the V-belt properly.
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4.CHECK BATTERY VOLTAGE.
2) Select “High mode” from “Alternator control” in “System Operation Check Mode”, and measure the battery voltage after 10 seconds or more have passed.
NOTE:
For detailed procedures, refer to “System Operation Check”.
3) Select “Low mode” from “Alternator control” in “System Operation Check Mode”, and measure the battery voltage.
CAUTION:
Do not continue the “Low mode” operation for more than one minute.
NOTE:
For detailed procedures, refer to “System Operation Check”.
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Does battery voltage lowered from 13.9 — 14.8 V to 12.2 — 13.1 V between step 2) and step 3)?
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5.CHECK HARNESS BETWEEN ECM AND GENERATOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and generator.
3) Measure the resistance of harness between ECM and generator connector.
Connector & terminal
(B134) No. 36 — (F26) No. 3:
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Is the resistance less than 1 Ω?
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Repair the open circuit of harness between ECM and generator connector.
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6.CHECK HARNESS BETWEEN ECM AND GENERATOR CONNECTOR.
Measure the resistance between generator connector and engine ground.
Connector & terminal
(B471) No. 3 — Engine ground:
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Is the resistance 1 MΩ or more?
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Repair the ground short circuit of harness between ECM and generator connector.
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7.CHECK BATTERY CURRENT SENSOR.
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Has water entered the connector?
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Completely remove any water inside.
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8.CHECK HARNESS BETWEEN ECM AND BATTERY CURRENT SENSOR CONNECTOR.
1) Disconnect the connectors from the ECM and battery current sensor.
2) Measure the resistance of the harness between the ECM and battery current sensor connector.
Connector & terminal
(B135) No. 22 — (B538) No. 3:
(B135) No. 32 — (B538) No. 1:
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Is the resistance less than 1 Ω?
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Repair the open circuit in the harness between the ECM and battery current sensor connector.
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9.CHECK HARNESS BETWEEN ECM AND BATTERY CURRENT SENSOR CONNECTOR.
Measure the resistance between ECM and chassis ground.
Connector & terminal
(B135) No. 22 — Chassis ground:
(B135) No. 32 — Chassis ground:
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Is the resistance 1 MΩ or more?
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Repair the short circuit to ground in the harness between the ECM and battery current sensor connector.
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10.CHECK HARNESS BETWEEN ECM AND BATTERY CURRENT SENSOR CONNECTOR.
Measure the resistance between ECM connectors.
Connector & terminal
(B135) No. 22 — (B135) No. 32:
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Is the resistance 1 MΩ or more?
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Repair the short circuit to power in the harness between the ECM and battery current sensor connector.
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11.CHECK HARNESS BETWEEN ECM AND BATTERY CURRENT SENSOR CONNECTOR.
1) Connect the connector to ECM.
2) Measure the resistance of the harness between the battery current sensor connector and engine ground.
Connector & terminal
(B538) No. 2 — Engine ground:
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Is the resistance less than 5 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit in harness between ECM and battery current sensor connector
• Poor contact of joint connector
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12.CHECK FOR POOR CONTACT.
Check for poor contact of the battery current sensor connector.
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Is there poor contact of the battery current sensor connector?
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Repair the poor contact of the battery current sensor connector.
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Replace the battery current sensor.
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