1996 PCED OBDI
SECTION 18: Diesel Diagnosis — 7.3L DI Engine

AN: Transmission Fluid Temperature (TFT) Sensor
  AN: Introduction  

 

AN1 KOEO AND KOER DIAGNOSTIC TROUBLE CODE (DTC) 0712

Is voltage reading above 4.6v?
YesNo
Faulty TFT sensor. REFER to Section 07-01A of the Powertrain, Drivetrain Service Manual for TFT sensor replacement.GO to AN2.
 

AN2 CHECK TFT SIG CIRCUIT FOR SHORTS TO GROUND AND SIG RTN

Is each resistance greater than 10,000 ohms?
YesNo
REPLACE damaged PCM. REMOVE breakout box. CLEAR DTCs and RETEST.REPAIR short to ground in TFT Circuit 923 (O/BK). CLEAR DTCs and RETEST.
 

AN3 KOEO AND KOER DTC 0713

Is voltage reading 5v?
YesNo
REPAIR short to power in Circuit 923 (O/BK). CLEAR DTCs and RETEST.GO to AN4.
 

AN4 SIGNAL RETURN CIRCUIT CHECK

Is resistance less than 5 ohms?
YesNo
GO to AN5.REPAIR open in signal return Circuit 359 (GR/Y).
 

AN5 INDUCE OPPOSITE FAILURE

Does voltage reading go to 0v?
YesNo
Faulty TFT sensor. REFER to Section 07-01A of the Powertrain, Drivetrain Service Manual for TFT sensor replacement.GO to AN6.
 

AN6 CHECK CONTINUITY OF TFT SIG CIRCUIT

Is resistance less than 5.0 ohms?
YesNo
REPLACE PCM. CLEAR DTCs and RETEST.SERVICE open in TFT SIG harness Circuit 923 (O/BK). REMOVE breakout box. RECONNECT all components. RERUN Quick Test.
 

AN7 KOEO AND KOER DIAGNOSTIC TROUBLE CODE (DTC) 1711: INCREASE/DECREASE TRANSMISSION FLUID TEMPERATURE

Is DTC 1711 still present?
YesNo
GO to AN8.Transmission fluid was not at operating temperature. RERUN Quick Test. SERVICE other DTCs as necessary.
 

AN8 CIRCUIT VOLTAGE CHECK

Is reading above .2v and below 4v?
YesNo
REPLACE PCM. CLEAR DTCs and RETEST.If DTC 0712 is also present, GO to AN1.

If DTC 0713 is also present, GO to AN3.

If DTC 1711 only, GO to Section 07-01A of the Powertrain, Drivetrain Service Manual for TFT sensor replacement. CLEAR DTCs and RETEST.
 

AN9 CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE (DTC) 0712: VERIFY TFT SIG VOLTAGE

Is TFT PID voltage less than 0.5 volts?
YesNo
The TFT SIG voltage is less than the acceptable minimum, but is not intermittent. GO to AN1.The fault that produced Continuous Memory DTC 0712 is intermittent. GO to AN10.
 

AN10 TRANSMISSION HARNESS CHECK

Does TFT valve fluctuate or go below .5v?
YesNo
REPAIR harness as required. CLEAR DTCs and RETEST.Intermittent unable to duplicate.
 

AN11 CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE (DTC) 0713: VERIFY TFT SIG VOLTAGE

Is TFT PID voltage greater than 4.8 volts?
YesNo
The TFT SIG voltage is greater than the acceptable maximum, but is not intermittent. GO to AN3.The fault that produced Continuous Memory DTC 0713 is intermittent. GO to AN12.
 

AN12 TRANSMISSION HARNESS CHECK

Does TFT PID valve fluctuate or go above 4.6v?
YesNo
REPAIR harness as required. CLEAR DTCs and RETEST.Intermittent unable to duplicate.
 

AN13 CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE (DTC) 1783: RERUN KOEO SELF TEST

Any transmission related DTCs generated?
YesNo
ADDRESS any transmission-related DTCs by referring to Diagnostic Trouble Code Description charts in Scan Tool Diagnostic Test Procedures section.REFER to Section 07-01A of the Powertrain, Drivetrain Service Manual for over temperature condition (check clutch, transmission fluid level etc.).