P0613-INTERNAL TCM

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The internal Watchdog (WD) is a separate hardware circuit that continuously monitors the microprocessor. To insure the proper operation of the Transmission controller the watchdog must receive a signal from the microprocessor within a specific time window (14 msec ± 1 msec) to prevent a system shutdown after a short delay (570 msec). The microprocessor periodically tests the WD's ability to provide this shutdown function using a three phase test;

1) Send the signal too late > 15 msec

2) Send the signal too early < 13 msec

3) Delay test < 590 msec

If the watchdog input signal arrives too early or too late, the Watchdog Fault line will go low and the watchdog delay will start to time out. The delay will be reset by the correct timing of watchdog signal sent during subsequent operations.

The Delay Test checks the delay time out. The Delay Monitor line is pulled low, which forces the delay to start timing out. At the end of the delay time the Transmission Relay will be turned off. The delay test, upon detection of the relay turning off, will immediately turn the relay back on before shutdown can occur.


  • When Monitored:

    1) One time after the controller is reset (ignition turned to the RUN position) and every 60 seconds thereafter. The Delay Test is executed after a reset only.

    2) 2 seconds after an invalid test.

  • Set Condition:

    If either of the following conditions occur 3 times:

    1) The watchdog fault line remains high after the period has elapsed for the too early - too late watchdog test.

    2) The Transmission Control Relay remains on after the watchdog delay expired.


Possible Causes
  
POWER OR GROUND CIRCUIT
  
POWERTRAIN CONTROL MODULE
  

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)



Diagnostic Test

1.CHECK THE WIRING AND CONNECTORS


NOTE: Due to the integration of the Powertrain and Transmission Control Modules, the transmission part of the PCM has it's own specific power and ground circuits.





Were there any problems found?

Yes


No