Workshop Manual

TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–37
DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Input
Step Action Yes No
1 Were you sent here from the “Powertrain On–Board Diagnostic
(OBD) System Check”?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Engine section
2 Perform the transmission fluid checking procedure. Refer to
Checking Transmission Fluid Level and Condition in Automatic
Transmission (4L30–E) section
Was the fluid checking procedure performed?
Go to Step 3
Refer to
Checking
Transmission
Fluid Level and
Condition in
Automatic
Transmission
(4L30–E) section
3 1. Install the scan tool.
2. With the engine “off”, turn the ignition switch “on”.
NOTE: Before clearing DTC(s), use the scan tool to record “Freeze
Frame” and “Failure Records” for reference, as data will be lost
when the “Clear Info” function is used.
3. Record the DTC “Freeze Frame” and “Failure Records”.
Does the scan tool display a TFT sensor signal voltage less than
0.4 volts?
Go to Step 4
Go to Diagnostic
Aids
4 1. Turn the ignition “off”.
2. Disconnect the transmission 7–way connector E–42.
3. Turn the ignition “on”.
Does the TFT signal voltage change to match the voltage 4.92
volts?
Go to Step 5 Go to Step 10
5 Using the J39200 DVOM, measure the resistance between
terminals E42–4(F) and E42–1(E).
Is the resistance within specifications? (See Transmission Fluid
Temperature (TFT) Sensor Specifications.)
Go to Diagnostic
Aids
Go to Step 6
6 1. Disconnect the transmission 7–way connector E–42.
2. Using the J39200 DVOM, measure the resistance between
terminals E42–4(F) and E42–1(E).
Is the resistance within specifications? (See Transmission Fluid
Temperature (TFT) Sensor Specifications.)
Go to Diagnostic
Aids
Go to Step 7
7 1. Remove the transmission oil pan. Refer to Transmission Oil
Temperature Sensor (Main Case) in Automatic Transmission
(4L30–E) section.
2. Check the internal wiring harness for a short to ground.
Was a problem found?
Go to Step 9 Go to Step 8
8 1. Disconnect the internal wiring harness at the TFT sensor.
2. Measure the resistance of the TFT sensor.
Is the resistance within specifications? (See Transmission Fluid
Temperature (TFT) Sensor Specifications.)
Go to Diagnostic
Aids
Go to Step 9
9 Replace the TFT Sensor.
Is the replacement complete?
Go to Step 13 —
10 Check circuit RED/BLK for a short to ground.
Was a problem found?
Go to Step 13 Go to Step 11