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DTC P1609: Battery Current Sensor Range/Performance
 
 
 
 
CIRCUIT OPERATION
  • A 5-volt voltage is supplied to the battery current sensor power terminal from the ECM terminal ECB5. The ground terminal is grounded with ECM terminal ECBE.
  • A voltage that is proportional to the battery current is sent to the ECM terminal ECB from the battery current sensor output terminal.
 
 
TECHNICAL DESCRIPTION
  • The battery current sensor outputs a voltage which corresponds to the battery current.
  • The ECM checks whether this voltage is within a specified range.
 
 
DESCRIPTIONS OF MONITOR METHODS
Check whether the battery current sensor output voltage changes or not during the engine running.
 
 
DTC SET CONDITIONS
Check Condition
  • After 30 seconds since the engine speed is more than 200 r/min.
Judgment Criterion
  • When there is no change in battery current sensor output voltage.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Prohibits generator output suppression control against current consumers. (operates as a normal generator.)
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are: )
  • Battery current sensor failed.
  • Harness damage.
  • Connector damage.
  • ECM failed.

 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle Communication Interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite Main Harness A
  • MB992747: V.C.I.-Lite USB Cable Short
  • MB992748: V.C.I.-Lite USB Cable Long
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
  • MB992110: Power Plant ECU Check Harness
STEP 1. Check battery itself
Refer to GROUP 54A, Battery - On-vehicle Service - Battery Check .
Is the check result normal?
Go to Step 2.
Repair it. Then go to Step 8.
 
STEP 2. Check battery test
Refer to GROUP 54A, Battery - On-vehicle Service - Battery Test .
Is the check result normal?
Go to Step 3.
Replace the battery. Then go to Step 8.
 
STEP 3. Check battery current sensor itself
Refer to GROUP 54A, Battery - Inspection - Battery Current Sensor Check <2.4 L Engine> .
Is the check result normal?
Go to Step 4.
Replace the battery current sensor. Then go to Step 8.
 
STEP 4. Check of harness damage in ECB5 line between battery current sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 5.
Repair it. Then go to Step 8.
 
STEP 5. Check of harness damage in ECBE line between battery current sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 6.
Repair it. Then go to Step 8.
 
STEP 6. Check of harness damage in ECB line between battery current sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 7.
Repair it. Then go to Step 8.
 
STEP 7. Using scan tool (M.U.T.-III), read the diagnostic trouble code (DTC).
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
(1) Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) .
(2) Start the engine and run at idle.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC P1609 stored?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 8.
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
 
STEP 8. Using scan tool (M.U.T.-III), read the diagnostic trouble code (DTC).
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
(1) Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) .
(2) Start the engine and run at idle.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC P1609 stored?
Retry the troubleshooting.
The inspection is complete.