DTC P1625 2AD-FHV

DTC P1625 Idle Signal Transmitter Circuit

 

Description

The ECM reduces injector operation speed and applied voltage to the injector to reduce the sound it produces during idling. To do this, the ECM outputs applied voltage switching signals to terminal IJEN of the EDU from terminal IDLO of the ECM.

Toyota fault code list DTC P1625

DTC No. DTC Detection Condition Trouble Area
P1625 When either condition below is met:
  1. With the engine running at idle, voltage of the ECM IDLO terminal is 0.05 V or less for 3 seconds or more.
  2. With the engine running at speeds higher than idle, voltage of the ECM IDLO terminal is 3.4 V or more for 3 seconds or more.
  1. Open or short in idle control circuit
  2. ECM

Wiring diagram


Wiring diagram DTC P1625

Inspection procedure

 

NOTICE:

After replacing the ECM, the new ECM needs registration and initialization.

1.CHECK WIRE HARNESS (EDU - ECM)

Disconnect the B51 EDU connector.

  1. Disconnect the B51 EDU connector.

  2. Disconnect the B32 ECM connector.

  3. Measure the resistance of the wire harness connectors.

     

    Standard resistance:

    Tester Connection Specified Condition
    B51-2 (IJEN) - B32-62 (IDLO) Below 1 ?
    B51-2 (IJEN) - B32-62 (IDLO) - Body ground 10 k? or higher

  4. Reconnect the EDU connector.

  5. Reconnect the ECM connector.

 

  NG  
REPAIR OR REPLACE HARNESS AND CONNECTOR
 
OK  
   
2.REPLACE EDU

  1. Replace the EDU.

 

NEXT  
   
3.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3.

  2. Turn the ignition switch on (IG) and turn the tester ON.

  3. Clear DTCs.

  4. Start the engine and drive the vehicle for approximately 15 minutes.

  5. Enter the following menus: Powertrain / Engine and ECT / DTC.

  6. Read the DTCs.

     

    Result:
    Display (DTC Output) Proceed to
    P1625 A
    No output B

 

  OK  
SYSTEM IS OK
 
NG  
   
REPLACE ECM 
2AD-FHV