Workshop Manual

TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–59
DTC P0748 Pressure Control Solenoid (PCS) (Force Motor) Circuit Electrical
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
Emission in
Engine section
2 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 the “Clear Info”
function is used.
3. Record the DTC “Failure Records”.
4. While the engine is operating, put the transmission in Park.
5. Using the scan tool, apply 70 through 1060 milliampere (mA)
while observing “PC Ref. Current” and “PC Act. Current”.
Is the “PC Act. Current” reading always within 160 mA?
Go to Diagnostic
Aids
Go to Step 3
3 1. Turn the ignition “off”.
2. Disconnect the transmission 4–way connector E–40.
3. Using the J39200 DVOM, measure the resistance between
terminals E40–2(B) and E40–4(C).
Is the resistance within 3–7 ohms?
Go to Step 7 Go to Step 4
4 1. Remove the transmission oil pan. Refer to Solenoid (Adapter
Case Valve Body) in Automatic Transmission (4L30–E)
section.
2. Disconnect the internal wiring harness at the PCS.
3. Measure the resistance of the PCS.
Is the resistance within 3–7 ohms?
Go to Step 6 Go to Step 5
5 Replace the PCS.
Is the replacement complete?
Go to Step 10 —
6 Repair the internal wiring harness for an open.
Is the repair complete?
Go to Step 10 —
7 Inspect/repair circuits VIO/WHT and VIO/RED.
Was a problem found?
Go to Step 10 Go to Step 8
8 Inspect/repair circuits VIO/WHT and VIO/RED for a short to
ground or poor connections.
Was a problem found?
Go to Step 10 Go to Step 9
9 Replace the PCM. Refer to Powertrain Control Module (PCM) in
Automatic Transmission (4L30–E) section.
Is the replacement complete?
Go to Step 10 —
10 1. After the repair is complete, use the scan tool to select “DTC”,
then “Clear Info” function and ensure the following conditions
are met:
The PCS duty cycle is not at its electrical high or low limit.
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