Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 428
7A1–22 TRANSMISSION CONTROL SYSTEM (4L30–E)
IMPORTANT:
Only four Fail Records can be stored.
Each Fail Record is for a different DTC. It is possible that
there will not be Fail Records for every DTC if multiple
DTCs are set.
Clear DTC
NOTE: If you clear the DTC (Diagnostic Trouble Codes)
you will not be able to read any codes recorded during the
last occurrence.
NOTE: To use the DTC again to identify a problem, you
will need to reproduce the fault or the problem. This may
require a new test drive or just turning the ignition on (this
depends on the nature of the fault).
1. If you have a Tech 2:
1. Connect the Tech 2 if it is still not connected GO
THROUGH Tech 2 OBD II CONNECTION.
2. Push “F1: Clear DTC Information” in the
Application Menu and answer “Yes” to the
question “Do you want to clear DTC’s?”
a. When a malfunction still exists and the Tech 2
displays “4L30E CODES NOT CLEARED”. This
means that the problem is still there or that the
recovery was not done. Please GO TO DTC
CHECK.
b. When a malfunction has been repaired and the
recovery is done. The Tech 2 displays “4L30E
CODES CLEARED”.
2. If you have no Tech 2:
Disconnect the PCM battery feed as necessary.
DTC Check
1. Diagnostic Trouble Codes (DTC) have been identified
by Tech 2.
2. You have written the list of the DTCs. The order of the
malfunctions has no meanings for this PCM. Usually
only one or two malfunctions should be set for a given
problem.
3. Check directly the DTCs you identified. The DTCs are
sorted by number. Refer to
Diagnostic Trouble Code
(DTC) Identification in this section.
PCM Precaution
The PCM can be damaged by:
1. Electrostatic discharge
2. The short circuit of some terminals to voltage or to
ground.
Electrostatic Discharge Damage Description:
1. Electronic components used to control systems are
often designed to carry very low voltage, and are very
susceptible to damage caused by electrostatic
discharge. It is possible for less than 100 volts of
static electricity to cause damage to some electronic
components. By comparison, it takes as much as
4,000 volts for a person to even feel the zap of a static
discharge.
2. There are several ways for a person to become
statically charged. The most common methods of
charging are by friction and induction. An example of
charging by friction is a person sliding across a car
seat, in which a charge of as much as 25,000 volts
can build up. Charging by induction occurs when a
person with well insulated shoes stands near a highly
charged object and momentarily touches ground.
Charges for the same polarity are drained off, leaving
the person highly charged with the opposite polarity.
Static charges of either type can cause damage,
therefore, it is important to use care when handling
and testing electronic components.
NOTICE:
To prevent possible electrostatic
discharge damage:
1. Do not touch the PCM connector pins or soldered
components on the PCM circuit board.
2. Be sure to follow the guidelines listed below if
servicing any of these electronic components:
3. Do not open the replacement part package until it is
time to install the part.
4. Avoid touching electrical terminals of the part.
5. Before removing the part from its package, ground
the package to a known good ground on the vehicle.
6. Always touch a known good ground before handling
the part. This step should be repeated before
installing the part if the part has been handled while
sliding across the seat, while sitting down from a
standing position or while walking some distance.
Information On PCM
1. The Powertrain Control Module (PCM) is located in
the center console and is the control center of the
electronic transmission control system.
2. The PCM must be maintained at a temperature below
85
°
(185
°
F) at all times. This is most essential if the
vehicle is put through a paint baking process. The
PCM will become inoperative if its temperature
exceeds 85
°
C (185
°
F). Therefore, it is
recommended that the PCM be removed or that
temporary insulation be placed around the PCM
during the time the vehicle is in a paint oven or other
high temperature process.
3. The PCM is designed to process the various inputs
and then respond by sending the appropriate
electrical signals to control transmission upshift,
downshift, shift feel and torque converter clutch
engagement.
4. The PCM constantly interprets information from the
various sensors, and controls the systems that affect
transmission and vehicle performance. By analyzing
operational problems, the PCM is able to perform a
diagnostic function by displaying DTC(s) and aid the
technician in making repairs.
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–23
Intermittent Conditions
If the Tech 2 displays a diagnostic trouble code as
intermittent, or if after a test drive a DTC does not
reappear though the detection conditions for this DTC are
present, the problem is most likely a faulty electrical
connection or loose wiring. Terminals and grounds should
always be the prime suspect. Intermittents rarely occur
inside sophisticated electronic components such as the
PCM.
Use the DTC information to understand which wires and
sensors are involved.
When an intermittent problem is encountered, check
suspect circuits for:
1. Poor terminal to wire connection.
2. Terminals not fully seated in the connector body
(backed out).
3. Improperly formed or damaged terminals.
4. Loose, dirty, or corroded ground connections:
HINT: Any time you have an intermittent in more than
one circuit, check whether the circuits share a
common ground connection.
5. Pinched or damaged wires.
6. Electro–Magnetic Interference (EMI):
HINT: Check that all wires are properly routed away
from coil, and generator. Also check for improperly
installed electrical options, such as lights, 2–way
radios, etc.
Use the F2: SNAPSHOT mode of the Tech 2 to help
isolate the cause of an intermittent fault. The snapshot
mode will record information before and after the problem
occurs. Set the snapshot to “trigger” on the suspect DTC.
If you notice the reported symptom during the test drive,
trigger the snapshot manually.
After the snapshot has been triggered, command the
Tech 2 to play back the flow of data recorded from each of
the various sensors. Signs of an intermittent fault in a
sensor circuit are sudden unexplainable jump in data
values out of the normal range.
Transmission And PCM Identification
The chart below contains a list of all important information
concerning rear axle ratio, Powertrain Control Module
(PCM), and transmission identification.
VEHICLE
Rr axle
PCM
TRANSMISSION
Type
Engine
Rr axle
Ratio
ISUZU Parts No.
Calibration
Code
Isuzu Part No.
Model Code
Isuzu /
3 5L V6
4 300
8–97287–830–0
G26
8–96023–779–0
YB (4
×
4)
Axiom
3.5L V6
4.300
8–09389–969–0
G26
8–96024–169–0
YE (4
×
2)
240R200001
7A1–24 TRANSMISSION CONTROL SYSTEM (4L30–E)
Diagnostic Trouble Code (DTC)
Identification
DTC
NUMBER
DTC NAME
DTC TYPE
MIL “CHECK
ENGINE”
“CHECK
TRANS”
P0218
Transmission Fluid Over Temperature
D
P0705
Transmission Range Switch (Mode Switch) Illegal
Position
D
P0706
Transmission Range Switch (Mode Switch)
Performance
D
P0711
Transmission Fluid Temperature (TFT) Sensor
Performance
D
P0712
Transmission Fluid Temperature (TFT) Sensor
Circuit Low Input
D
P0713
Transmission Fluid Temperature (TFT) Sensor
Circuit High Input
D
P0719
Brake Switch Circuit Low (Stuck On)
D
P0722
Automatic Transmission Output Speed Sensor
(OSS) Low Input
B
ON
Flash
P0723
Automatic Transmission Output Speed Sensor
(OSS) Intermittent
B
ON
Flash
P0724
Brake Switch Circuit High (Stuck Off)
D
P0730
Gear Error Without Input Speed
C
Flash
P0742
Torque Converter Clutch (TCC) System Stuck On
B
ON
Flash
P0748
Pressure Control Solenoid (PCS) (Force Motor)
Circuit Electrical
C
Flash
P0751
Shift Solenoid A Performance (Stuck Off)
B
ON
Flash
P0752
Shift Solenoid A Performance (Stuck On)
B
ON
Flash
P0753
Shift Solenoid A Electrical
B
ON
Flash
P0756
Shift Solenoid B Performance (Stuck Off)
B
ON
Flash
P0757
Shift Solenoid B Performance (Stuck On)
B
ON
Flash
P0758
Shift Solenoid B Electrical
B
ON
Flash
P1850
Brake Band Apply Solenoid Malfunction
D
P1860
TCC Solenoid Electrical
B
ON
Flash
P1870
Transmission Component Slipping (TCC Stuck
Off)
B
ON
Flash
DTC TYPE
DEFINITION
B
Emission related, turn on MIL (Check Engine) and flashing Check Trans after 2 consecutive trips
(Removal to confirmed)
C
Non–emission related, flashing Check Trans on 1st failure
D
Non–emission related, no lamps
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–25
DTC P0218 Transmission Fluid Over Temperature
D07R200004
Circuit Description
The Transmission Fluid Temperature (TFT) sensor is a
thermister that controls the signal voltage to the PCM.
The PCM supplies a 5–volt reference to the sensor on
circuit RED/BLK. When the transmission fluid is cold, the
sensor resistance is high and the PCM will sense high
signal voltage. As the fluid temperature warms to a
normal transmission operating temperature of 100
°
C
(212
°
F), the sensor resistance becomes less and the
voltage decreases to 1.5 to 2.0 volts.
This DTC detects a high transmission temperature for a
long period of time. This is a type “D” DTC.
Conditions For Setting The DTC
D
No TFT DTCs P0712 or P0713.
D
TFT is greater than 135
°
C (275
°
F).
D
All conditions met for 21 seconds.
Action Taken When The DTC Sets
D
Hot mode TCC Shift Pattern.
D
The PCM will not illuminate the Malfunction Indicator
Lamp (MIL).
D
ATF Lamp ON. (TFT is greater than 145
°
C (293
°
F))
D
Disable E–side TCC OFF request.
Conditions For Clearing The DTC
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 warm–up 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.
D
When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
D
Check harness routing for a potential short to ground
in circuit RED/BLK.
D
Scan tool TFT sensor temperature should rise
steadily to about 100
°
C (212
°
F), then stabilize.
D
Check for a “skewed” (mis–scaled) sensor by
comparing the TFT sensor temperature to the
ambient temperature after a vehicle cold soak. A
“skewed” sensor can cause delayed garage shifts or
TCC complaints.
D
Check for a possible torque converter stator problem.
D
Verify customer driving habits, trailer towing, etc.
Test Description
The numbers below refer to
the step numbers on the
diagnostic chart.
3. This test checks for a “skewed” sensor or shorted
circuit.
4. This test simulates a TFT DTC P0713.
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