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DTC P0515: Battery Temperature Sensor Circuit
 
 
 
 
CIRCUIT OPERATION
  • Approximately 5 volts are applied to the battery temperature sensor output terminal from the ECM terminal BTS via the resistor in the ECM. The ground terminal is grounded with ECM terminal ECBE.
  • The battery temperature sensor is a negative temperature coefficient type of resistor. When the battery temperature rises, the resistance decreases.
  • The battery temperature sensor output voltage increases when the resistance increases and decreases when the resistance decreases.
 
 
TECHNICAL DESCRIPTION
  • The battery temperature sensor converts the battery temperature to a voltage.
  • The ECM checks whether this voltage is within a specified range.
 
 
DESCRIPTIONS OF MONITOR METHODS
Battery temperature sensor output voltage is out of specified range.
 
 
DTC SET CONDITIONS
Check Condition
  • After 2 seconds since the ignition switch is turned ON or since the completion of engine start.
Judgment Criterion
  • Battery temperature sensor output voltage is more than 4.6 V (corresponding to a battery temperature of -50°C or less) for 2 seconds.
or
  • Battery temperature sensor output voltage is less than 0.2 V (corresponding to a battery temperature of 90°C or more) 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 temperature sensor failed.
  • Open/shorted battery temperature 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 the battery temperature sensor.
  • Check battery temperature sensor itself (Refer to GROUP 54A, Battery - Inspection - Battery Current Sensor Check ).
Is the check result normal?
Go to Step 2.
Replace the battery current sensor. Then go to Step 8.
 
STEP 2. Measure the sensor supply voltage at battery temperature sensor harness side connector.
(1) Disconnect the battery temperature sensor connector and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal BTS line and ground.
  • Voltage should be between 4.5 and 4.9 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.5 and 4.9 volts?
Go to Step 5.
Go to Step 3.
 
STEP 3. Check of short to ground and open circuit in BTS line between battery temperature sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 4.
Repair it. Then go to Step 8.
 
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) 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 DTC P0515 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 5. Check the continuity at battery temperature sensor harness side connector.
(1) Disconnect the battery temperature 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 temperature 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. Check of harness damage in BTS line between battery temperature sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 4.
Repair it. Then go to Step 8.
 
STEP 8. Using scan tool (M.U.T.-III), read the diagnostic trouble code (DTC).
(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 P0515 stored?
Retry the troubleshooting.
The inspection is complete.