Workshop Manual

7A1–26
TRANSMISSION CONTROL SYSTEM (4L30–E)
DTC P0218 Transmission Fluid Over Temperature
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 following checks:
B Check for possible engine system problems.
B Transmission fluid checking procedure. Refer to Checking
Transmission Fluid Level and Condition in Automatic
Transmission (4L30–E) Section.
Were the checks performed?
Go to Step 3 —
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 “Failure
Records” for reference, as data will be lost when “Clear Info”
function is used.
3. Record the DTC “Failure Records”.
Is the TFT sensor signal voltage less than 1.54 volts?
Go to Step 4
Go to Diagnostic
Aids
4 1. Turn the ignition “off”.
2. Disconnect the transmission 7–way connector E–42
(additional DTCs may set).
3. With the engine “off”, turn the ignition switch “on”.
Is the TFT sensor signal voltage greater than 4.92 volts?
Go to Internal
Wiring Harness
Check
Go to Step 5
5 Inspect/repair circuit RED/BLK for a short to ground.
Was a problem found?
Go to Step 7 Go to Step 6
6 1. Inspect the PCM for poor connections.
2. Replace the PCM if no poor connections were found.
Is the replacement complete?
Go to Step 7 —
7 1. After the repair is complete, use the scan tool to select “DTC”,
then “Clear Info” function and ensure the following conditions
are met:
TFT is less than 125°C (257°F) for at least 10 seconds.
2. Review the scan tool “DTC Info”.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table