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DTC P1607: Malfunction of the System Power Supply (Low Voltage)
 
 
 
 
DIAGNOSTIC FUNCTION
The TCM determines that the system is faulty if too low battery voltage is supplied to the TCM (open circuit in the power supply circuit).
 
 
DESCRIPTIONS OF MONITOR METHODS
The voltage, which is applied to the solenoid valve, is abnormal.
 
 
MONITOR EXECUTION
Ignition switch (IG1) line voltage: 11 volts or more
 
 
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
LOGIC FLOW CHARTS (Monitor Sequence)
 
 
DTC SET CONDITIONS
Check Conditions
  • Power supply voltage (IG1 line voltage): 11 volts or more
Judgment Criteria
  • Solenoid drive voltage (battery line voltage) remains less than 8.0 volts for 0.2 second.
 
 
OBD-II DRIVE CYCLE PATTERN
Ignition switch: "ON" position (start the engine and keep it for 10 seconds or more)
 
 
PROBABLE CAUSES
  • Damaged wiring harness and connectors
  • Malfunction of TCM
 
 
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)
STEP 1. Using scan tool (M.U.T.-III), check the other DTC(s) is stored.
Check if DTC(s) other than DTC P1607 is stored.
Is the DTC stored?
Carry out the appropriate troubleshooting (Refer to ).
Go to Step 2.
 
STEP 2. Check the TCM connector for a contact status problem and internal short circuit.
Is the check result normal?
Go to Step 3.
Replace the TCM (Refer to ).
 
STEP 3. Check for open circuit or short to ground in BATT, BAT2 line between the TCM connector and the battery.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Using scan tool (M.U.T.-III), recheck the DTC.
Check again if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Carry out a test drive with the OBD-II drive cycle pattern.
(4) Recheck the DTC.
Is DTC P1607 stored?
Replace the TCM (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).