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DTC P1608: Battery Current Sensor Circuit
 
 
 
 
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
Battery current sensor output voltage is out of specified range.
 
 
DTC SET CONDITIONS
Check Condition
  • Ignition switch is "ON" position
Judgment Criterion
  • The battery current sensor output voltage is less than 0.2 V for 2 seconds.
or
  • The battery current sensor output voltage is more than 4.8 V for 2 seconds.
 
 
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.
  • Open or shorted battery current sensor circuit, harness damage or 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 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 2.
Replace the battery current sensor. Then go to Step 9.
 
STEP 2. Measure the sensor supply voltage at battery current sensor harness side connector.
(1) Disconnect the battery current sensor connector and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal ECB5 line and ground.
  • Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Go to Step 5.
Go to Step 3.
 
STEP 3. Check of short to ground and open circuit in ECB5 line between battery current sensor and ECM connector.
Is the harness wire in good condition?
Go to Step 4.
Repair it. Then go to Step 9.
 
STEP 4. 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) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC P1608 stored?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 9.
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 5. Check the continuity at battery current sensor harness side connector.
(1) Disconnect the battery current sensor connector and measure at the harness side.
(2) Check for the continuity between terminal ECBE line and ground.
  • Continuity (2 ohms or less)
Does continuity exist?
Go to Step 7.
Go to Step 6.
 
STEP 6. Check of open circuit and harness damage in ECBE line between battery current sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 4.
Repair it. Then go to Step 9.
 
STEP 7. 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 8.
Repair it. Then go to Step 9.
 
STEP 8. Check of short to ground, open circuit and harness damage in ECB line between battery current sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 4.
Repair it. Then go to Step 9.
 
STEP 9. 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 P1608 stored?
Retry the troubleshooting.
The inspection is complete.