Isuzu Trooper (2000 year). Manual — part 412

7A1–62 TRANSMISSION CONTROL SYSTEM (4L30–E)

DTC P0752 Shift Solenoid A Performance (Stuck ON)

D07RT011

Circuit Description

The shift solenoid A is used to control fluid flow acting on
the 1–2 and 3–4 shift valves. The solenoid is a normally
close exhaust valve that is used with the shift solenoid B
to allow four different shifting combinations.
The DTC detects when there is only a 2–2–3–3 shift
pattern depending on the state of the mechanical failure
instead of a 1–2–3–4 shift pattern. This is a type “B” DTC.

Conditions For Setting The DTC

D

No ETC DTCs.

D

No OSS DTCs P0722 or P0723.

D

No TCC solenoid DTC P0742, P1860, P1870.

D

No shift solenoid A DTC P0753.

D

No shift solenoid B DTC P0758.

D

Gear range is D4.

D

Output speed is greater than 375 rpm.

D

Transmission temperature is between 20

°

and 130

°

C

(68

°

and 266

°

F).

D

No range code P0705, P0706.

D

No torque code (to be confirmed).

D

Engine run for more 0 seconds and not influed cut-off
(to be confirmed).

All the above conditions have been met and the
combination of condition 1, 2 occur two consecutive
times.

Condition 1:

D

1st gear is commanded for

≥

1 sec

D

40

≤

Engine Torque

≤

400 N·m

D

Throttle positon

≥

10%

D

–8000

≤

TCC slip

≤

8000 rpm

D

Transmission out speed

≥

375 rpm

D

Speed ratio

≥

0.3

D

1.5

≤

Modeled Ratio

≤

2.4 for 0.687 seconds

Condition 2:

D

4th Gear is commanded for

≥

1 sec.

D

40

≤

Engine Torque

≤

400 N·m

D

Trottle position

≥

10%

D

–8000

≤

TCC slip

≤

8000 rpm

D

Speed ratio

≥

0.6

D

0.92

≤

Modeled Ratio

≤

1.5 for 7 seconds

Action Taken When the DTC Sets

D

Maximum line pressure.

D

For lamp illuminate refer to DTC type definition (type
B).

D

Turn force motor OFF.

Conditions For Clearing The The MIL/DTC

D

The PCM will turn off the MIL and CHECK TRANS
Lamp after three consecutive ignition cycles without a
failure reported.

D

The DTC can be cleared from the PCM history by
using a scan tool.

D

The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.

D

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled “off”
long enough to power down the PCM.

Diagnostic Aids

D

Verify that the transmission meets the specifications
in the 4L30–E shift speed chart.

D

Other internal transmission failures may cause more
than one shift to occur.

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–63

Test Description

The numbers below refer to the step numbers on the
diagnostic chart:
2. This test checks the function of the range switch

(mode switch).

3. This test checks that the scan tool commanded all

shifts, all shifts solenoids responded correctly, but
all the shifts did not occur.

DTC P0752 Shift Solenoid A Performance (Stuck ON)

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

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”.
4. With the engine operating, apply the brake pedal and select

each transmission range D1, D2, D3, D4, N, R, and P.

Does each selected transmission range match the “TR Switch” on
the scan tool?

Go to Step 3

Go to“Range

Switch Logic

Table”

3

1. While the engine is operating, raise the drive wheels.
2. With the transmission in D4 range, use the scan tool to

command 1st, 2nd and 3rd, and 4th gears while accelerating
the vehicle.

Was a 2–3 or 1–4 only shift pattern detected? (Road testing the
vehicle may be necessary).

Go to Step 4

Go to Diagnostic

Aids

4

Check the shift solenoid/hydraulic circuit for:

D

One or both of the shift solenoids for an internal malfunction.

D

Contamination or sediment in one or both of the shift
solenoids.

D

Damaged seals on one or both of the shift solenoids.

Refer to Solenoid (Main Case Valve Body) in Automatic
Transmission (4L30–E) section.

Was a problem found and corrected?

Go to Step 5

Go to Diagnostic

Aids

5

1. After the repair is complete, use the scan tool to select “DTC”,

then “Clear Info” function and road test the vehicle.

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

7A1–64 TRANSMISSION CONTROL SYSTEM (4L30–E)

DTC P0753 Shift Solenoid A Electrical

D07RY00014

Circuit Description

D

The shift solenoid A is a simple on/off solenoid
located in the main case valve body. The solenoid is
the normally closed type. In second or third gear, the
Powertrain Control Module (PCM) energizes the
solenoid to open a fluid inlet port. When the port is
open, fluid pressure actuates the shift valve.

D

The solenoid is activated by current. This current is
produced by applying a voltage to one side (the High
side) and a ground to the other side (Low side).

D

The High Side Driver (HSD) is a circuit of the PCM
that acts as a switch between the solenoids and the
supply voltage. The High side of the solenoid is
permanently supplied with voltage, except in
BACKUP MODE or when ignition is off the HSD is
turned off.

This DTC detects a continuous open or short to ground in
the shift solenoid A circuit or the shift solenoid A. This is a
type “B” DTC.

Conditions For Setting The DTC

D

Ignition is “on”, Engine “run”.

D

Battery voltage is between 10 and 16 volts.

D

The PCM commands the solenoid “on” and the
voltage remains high (B+) or the PCM commands the
solenoid “off” and the voltage remains low (zero
volts).

D

All conditions met for 0.84

∼

1.0 seconds.

Action Taken When The DTC Sets

D

Maximum line pressure.

D

Immediate landing to 4th gear.

D

Inhibit TCC engagement.

D

For lamp illuminate refer to DTC type definition (type
B).

Conditions For Clearing The MIL/DTC

D

The PCM will turn off the MIL and CHECK TRANS
Lamp after three consecutive ignition cycles without a
failure reported.

D

The DTC can be cleared from the PCM history by
using a scan tool.

D

The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.

D

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled “off”
long enough to power down the PCM.

Diagnostic Aids

D

Inspect the wiring for poor electrical connection at the
PCM and at the transmission 16–way connectors.
Look for possible bent, backed out, deformed or
damaged terminals. Check for weak terminal tension
as well. Also check for a chafed wire that could short
to bare metal or other wiring. Inspect for a broken wire
inside the insulation.

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–65

D

When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.

D

An open ignition feed circuit can cause multiple DTCs
to set.

D

A shift solenoid B DTC P0758 could also set with a
shift solenoid A electrical failure.

Test Description

The numbers below refer to the step numbers on the
diagnostic chart:
3. This test checks for power to the shift solenoid A

from the ignition through the PCM.

5. This test measures the resistance of the component.
9. This test checks the function of the shift solenoid A

and the transmission internal wiring harness.

Shift Solenoid Status Chart

Gear

Shift solenoid A

Shift solenoid B

1st

OFF

ON

2nd

ON

ON

3rd

ON

OFF

4th

OFF

OFF

DTC P0753 Shift Solenoid A 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

Emissions in

Engine section

2

1. Install the scan tool.
2. With the engine “on”, 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”.

Were DTCs P0753, P0758, P1860 set?

Go to Step 3

Go to Diagnostic

Aids

3

1. Turn the ignition “on”.
2. Using the J39200 DVOM, measure the voltage between PCM

connector terminals J2–43 and J1–1 (GND).

Is the voltage within 10–12 volts?

Go to Step 4

Go to Step 5

4

1. Turn the ignition “off”.
2. Disconnect the J2 (RED) PCM connector.
3. Turn the ignition “on”.
4. Using the J39200 DVOM, measure the voltage between PCM

connector terminals J1–5 and ground.

Is the voltage within 10 – 12 volts?

Go to Step 11

Go to Step 5

5

1. Turn the ignition “off”.
2. Disconnect the J2 (RED) PCM connector.
3. Using the J39200 DVOM, measure the resistance between

PCM connector terminals J2–43 and J1–5.

Is the resistance within 18 – 20 ohms?

Go to Step 6

Go to Step 7

6

1. Disconnect the J1 (BLUE) and J2 (RED) PCM connectors.
2. Using the J39200 DVOM, check a continuity between PCM

terminals J2–43 and ground.

Is there a continuity?

Go to Step 12

Go to Step 8

7

1. Disconnect the 16–way harness connector H–56.
2. Using the J39200 DVOM, measure the resistance between

terminals H56–11 and H56–10.

Is the resistance within 18–20 ohms?

Go to Step 14

Go to Step 9