Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 440
7A1–70 TRANSMISSION CONTROL SYSTEM (4L30–E)
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 for selected gear ratio vs. a ratio
not obtainable under normal driving conditions.
DTC P0757 Shift Solenoid B 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 DL, 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 4–3–3–4 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 the 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
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–71
DTC P0758 Shift Solenoid B Electrical
D07R200010
Circuit Description
D
The shift solenoid B is a simple on/off solenoid
located in the main case valve body. It is normally
open. When the port is open, fluid pressure actuates
the shift valve. In first or second gear, the Powertrain
Control Module (PCM) energizes the solenoid to
close a fluid inlet port.
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. In BACKUP
MODE or when the ignition is off, the HSD is turned
off.
This DTC detects a continuous open or short to ground in
the shift solenoid B circuit or shift solenoid B. 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
Fixed to 4th gear.
D
Maximum line pressure.
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 connections at
the PCM and transmission 7-way connector. 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.
7A1–72 TRANSMISSION CONTROL SYSTEM (4L30–E)
D
When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
Test Description
The numbers below refer to the
step numbers on the
diagnostic chart:
5. This test measures the resistance of the component.
6. This test checks the function of the shift solenoid B
and the transmission internal wiring harness.
9.This test checks for power to the shift solenoid B
from the ignition through the PCM.
Shift Solenoid Status Chart
Gear
Shift solenoid A
Shift solenoid B
1st
OFF
ON
2nd
ON
ON
3rd
ON
OFF
4th
OFF
OFF
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–73
DTC P0758 Shift Solenoid B 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 “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 4
Go to
Step 3
3
1. The engine “on”.
2. Apply brake pedal and select transmission range “D”.
3. Press and hold down the winter switch and select transmission
mode “winter”.
Does the scan tool display DTC P0758 at 3rd gear?
Go to
Step 7
Go to
Diagnostic
Aids
4
1. Turn the ignition “off”.
2. Disconnect the E-34 (BLUE) and E-35 (RED) PCM
connectors.
3. Turn the ignition “on”.
4. Using the J39200 DVOM, measure the voltage between PCM
connector terminals E35–31 and E35–1.
Is the voltage within 10 – 12 volts?
Go to
Step 13
Go to
Step 5
5
1. Turn the ignition “off”.
2. Using the J39200 DVOM, measure the resistance between
PCM connector terminals E35–31 and E35–43.
Is the resistance within 18 – 20 ohms?
Go to
Step 14
Go to
Step 6
6
1. Disconnect the transmission main case connector E–42.
2. Using the J39200 DVOM, measure the resistance between
terminals E42–6(A) and E42–2(D).
Is the resistance within 18 – 20 ohms?
Go to
Step 15
Go to
Step 16
7
1. Turn the ignition “off”.
2. Disconnect the E-34 (BLUE) and E-35 (RED) PCM
connectors.
3. Using the J39200 DVOM, measure the resistance between
PCM connector terminals E35–31 and E35–43.
Is the resistance within 18 – 20 ohms?
Go to
Step 8
Go to
Step 10
8
Using the J39200 DVOM, check a continuity between PCM
connector terminal E35–31 and ground.
Is there a continuity?
Go to
Step 17
Go to
Step 9
9
Using the J39200 DVOM, check a continuity between PCM
connector terminal E35–43 and ground.
Is there a continuity?
Go to
Step 18
Go to
Step 11
10
1. Disconnect the transmission main case connector E-42.
2. Using the J39200 DVOM, measure the resistance between
terminals E42–6(A) and E42–2(D).
Is the resistance within 18 – 20 ohms?
Go to
Step 19
Go to
Step 20
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст