Code No. P1608: Battery Current Sensor System
OPERATION
- A power voltage of 5 V is applied to the battery current sensor connector
terminal from the engine-ECU connector terminal ECB5 and is earthed to the engine-ECU connector
terminal AFSE&ECBE from the battery current sensor connector terminal.
- The battery current sensor connector terminal outputs a sensor signal, which is
input into the engine-ECU connector terminal ECB.
FUNCTION
- The battery current sensor detects a battery current and inputs a signal
into the engine-ECU.
- In response to the signal, the engine-ECU controls charging and discharging.
TROUBLE JUDGMENT
Check Condition
- Battery positive voltage is 8 - 16 V.
- 2 seconds later after the ignition switch has been in "ON" position or the engine
has started up.
- The battery current sensor output voltage is less than 0.2 V.
- The battery current sensor output voltage is more than 4.7 V.
FAIL-SAFE AND BACKUP FUNCTION
- The AS&G control is prohibited.
PROBABLE CAUSES
- Failed battery current sensor
- Open/short circuit or harness damage in battery current sensor circuit or loose
connector contact
- Failed engine-ECU
DIAGNOSIS PROCEDURE |
STEP 1. Check battery current sensor itself. |
Q.
Is the check result normal?
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Go to Step 2. |
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Repair or replace the connector, or replace the battery current sensor. |
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STEP 2. Perform voltage measurement at battery current sensor connector. |
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OK: 4.9 - 5.1 V |
Q.
Is the check result normal?
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Go to Step 4. |
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Go to Step 3. |
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STEP 3. Check harness between battery current sensor connector terminal and engine-ECU connector terminal ECB5. |
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Q.
Is the check result normal?
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Go to Step 8. |
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Repair or replace the connector, or repair the damaged harness wire. |
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STEP 4. Perform resistance measurement at battery current sensor connector. |
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OK: Continuity (2 Ω or less) |
Q.
Is the check result normal?
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Go to Step 6. |
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Go to Step 5. |
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STEP 5. Check harness between battery current sensor connector terminal and engine-ECU connector terminal AFSE&ECBE. |
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Q.
Is the check result normal?
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Go to Step 8. |
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Repair or replace the connector, or repair the damaged harness wire. |
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STEP 6. Check harness between battery current sensor connector terminal and engine-ECU connector terminal ECB5. |
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Q.
Is the check result normal?
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Go to Step 7. |
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Repair or replace the connector, or repair the damaged harness wire. |
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STEP 7. Check harness between battery current sensor connector terminal and engine-ECU connector terminal ECB. |
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Q.
Is the check result normal?
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Go to Step 8. |
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Repair or replace the connector, or repair the damaged harness wire. |
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STEP 8. M.U.T.-III diagnosis code |
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Q.
Is the diagnosis code set?
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Replace the engine-ECU. |
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions ). |
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