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DTC P0657-00: Throttle valve control servo relay circuit malfunction
 
 
 
 
CIRCUIT OPERATION
  • Throttle actuator relay is built into the IPDM E/R.
  • In the IPDM E/R, the voltage from the 12V battery is applied.
  • Voltage from the 12V battery is applied to the control terminal of the throttle actuator relay.
  • The ECM connector terminal number 65 turns ON the power transistor in the unit, and the relay turns ON through electricity being supplied to the throttle actuator relay coil.
  • When the throttle actuator relay turns ON, 12V battery voltage is supplied from the throttle actuator relay to the ECM connector terminal number 64.
 
 
TECHNICAL DESCRIPTION
When the power supply mode of the electric motor switch ON signal is input into the ECM, the ECM turns ON the throttle actuator control motor relay.
 
 
DESCRIPTIONS OF MONITOR METHODS
Throttle actuator relay circuit voltage is smaller than the specified value.
 
 
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
  • 12V battery positive voltage is higher than 8.3 volts.
Judgment Criterion
  • The power line voltage of the electronic controlled throttle valve system should be 6.0 volts or lower for 0.35 second.
 
 
FAIL-SAFE AND BACKUP FUNCTION
Throttle opening degree position is in default position.
 
 
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 1 OBD- II DRIVE CYCLE.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Throttle actuator relay (built into the IPDM E/R) failed.
  • Open or shorted throttle actuator relay 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 65.
  • Disconnect connector, and measure at harness side.
  • Power supply mode of electric motor switch: ON
  • Voltage between ECM connector terminal number 65 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 67 and ECM connector terminal number 65.
 
3.STEP 3. Perform voltage measurement at ECM connector terminal number 64.
  • Disconnect connector, and measure at harness side.
  • Short-circuit ECM connector the terminal number 65 to the ground.
  • Voltage between ECM connector terminal number 64 and ground.
OK: 12V battery positive voltage
Q: Is the check result normal?
 
4.STEP 4. Check harness between IPDM E/R connector terminal number 72 and ECM connector terminal number 64.
Check power supply line for open/short circuit.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
5.STEP 5. Test the OBD-II drive cycle.
After erasing the DTC, carry out test drive with the drive cycle pattern, and recheck the DTC.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Carry out test drive with the drive cycle pattern (Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 1 OBD- II DRIVE CYCLE).
(3) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC P0657-00 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).