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DTC P0606-00: Engine-ECU main processor malfunction
 
 
 
 
CIRCUIT OPERATION
  • MFI relay is built into the IPDM E/R.
  • In the IPDM E/R, the voltage from the 12V battery is applied.
  • The ECM connector terminal number 95 turns ON the power transistor in the unit, and the relay turns ON through electricity being supplied to the MFI relay coil.
  • When the MFI relay turns ON, 12V battery voltage is supplied from the IPDM E/R to the ECM, the sensor, and the actuator.
 
 
TECHNICAL DESCRIPTION
Throttle actuator control processor checks the ECM for abnormal conditions.
 
 
DESCRIPTIONS OF MONITOR METHODS
No watch dog pulse is detected.
 
 
MONITOR EXECUTION
Continuous.
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Check Condition
  • Power supply mode of electric motor switch is ON.
Judgment Criterion
  • No surveillance pulse signals is inputted for 0.5 second.
Check Condition
  • When the ECM wake up.
Judgment Criterion
  • When the communication error is judged between main-CPU and sub-CPU for 10 times.
 
 
FAIL-SAFE AND BACKUP FUNCTION
Throttle opening degree position is in default position.
 
 
OBD-II DRIVE CYCLE PATTERN
None.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • MFI relay (built into the IPDM E/R) failed.
  • Shorted MFI relay circuit or connector damage.
  • Open or shorted electric motor switch 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
1.STEP 1. Using scan tool (M.U.T.-III SE), read the other system DTC.
Use scan tool (M.U.T.-III SE) to check and see if a DTC is set in the IPDM E/R [Refer to ELECTRICAL & POWER CONTROL, Power Control System – IPDM E/R – System Description – Diagnosis System (IPDM E/R) M.U.T.-III SE Function (IPDM E/R)].
Q: Is any DTC set in the IPDM E/R?
Perform troubleshooting of IPDM E/R system (Refer to ELECTRICAL & POWER CONTROL, Power Control System – IPDM E/R – System Description – Diagnosis System (IPDM E/R) M.U.T.-III SE Function (IPDM E/R)).
 
2.STEP 2. Perform voltage measurement at ECM connector terminal number 84.
  • Disconnect connector, and measure at harness side.
  • Power supply mode of electric motor switch: ON
  • Voltage between ECM connector terminal number 84 and ground.
OK: 12V battery positive voltage
Q: Is the check result normal?
Repair or replace the connector, or check and repair harness between IPDM E/R connector terminal number 19 and ECM connector terminal number 84.
 
3.STEP 3. Check harness between IPDM E/R connector terminal number 19 and ECM connector terminal number 84.
Check power supply line for damage.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
4.STEP 4. Check harness between IPDM E/R connector terminal number 93 and ECM connector terminal number 95.
Check power supply line for short circuit.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
5.STEP 5. Using scan tool (M.U.T.-III SE), DTC recheck after erasing DTC.
After erasing the DTC, check again to see if the DTC is set again.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Turn OFF the power supply mode of the electric motor switch.
(3) Turn ON the power supply mode of the electric motor switch.
(4) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC P0606-00 set?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points – How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).