Isuzu Trooper 1999 Workshop Manual page 1515

7A1–62 TRANSMISSION CONTROL SYSTEM (4L30–E)
DTC P0748 Pressure Control Solenoid (PCS) (Force Motor) Circuit Electrical
Step
1 Were you sent here from the "Powertrain On–Board Diagnostic
(OBD) System Check"?
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 0.1 amp through 1.0 amp while
observing "PC Ref. Current" and "PC Act. Current".
Is the "PC Act. Current" reading always within 0.16 amp?
3 1. Turn the ignition "off".
2. Disconnect the transmission 5–way connector M–6.
3. Using the J39200 DVOM, measure the resistance between
terminals M6–2(B) and M6–1(E).
Is the resistance within 3–7 ohms?
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?
5 Replace the PCS.
Is the replacement complete?
6 Repair the internal wiring harness for an open.
Is the repair complete?
7 Inspect/repair circuits J3–E4, M6–2(B), J3–E3, and M6–1(E).
Was a problem found?
8 Inspect/repair circuits J3–E4, M6–2(B), J3–E3, and M6–1(E) for
a short to ground or poor connections.
Was a problem found?
9 Replace the PCM. Refer to Powertrain Control Module (PCM) in
Automatic Transmission (4L30–E) section.
Is the replacement complete?
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?
Action Yes
Go to OBD
System Check
Driveability and
Emission in
Go to Step 2 Engine section
Go to Diagnostic
Go to Step 3
Aids
Go to Step 7 Go to Step 4
Go to Step 6 Go to Step 5
Go to Step 10
Go to Step 10
Go to Step 10 Go to Step 8
Go to Step 10 Go to Step 9
Go to Step 10
Begin diagnosis
again
Repair verified
Go to Step 1
Exit DTC table
No
Refer to
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