Isuzu Trooper (1998-2002 year). Service manual — part 760
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–25
Isuzu Trooper
240RY00031
7A1–26 TRANSMISSION CONTROL SYSTEM (4L30–E)
Diagnostic Trouble Code (DTC)
Identification
DTC
NUMBER
DTC NAME
DTC TYPE
“CHECK
TRANS”
P0218
Transmission Fluid Over Temperature
D
P0560
System Voltage Malfunction
C
Flash
P0705
Transmission Range Switch (Mode Switch) Illegal Position
D
P0706
Transmission Range Switch (Mode Switch) Performance
D
P0712
Transmission Fluid Temperature Sensor Circuit Low Input
(TFT)
D
P0713
Transmission Fluid Temperature (TFT) Sensor Circuit High
Input
D
P0719
TCC Brake Switch Circuit High (Stuck ON)
D
P0722
Transmission Output Speed Sensor (OSS) Low Input
C
Flash
P0723
Transmission Output Speed Sensor (OSS) Intermittent
C
Flash
P0730
Transmission Incorrect Gear Ratio
C
Flash
P0748
Pressure Control Solenoid (PCS) (Force Motor) Circuit
Electrical
C
Flash
P0753
Shift Solenoid A Electrical
C
Flash
P0758
Shift Solenoid B Electrical
C
Flash
P1790
ROM Transmission Side Bad Check Sum
C
Flash
P1792
EEPROM Transmission Side Bad Check Sum
C
Flash
P1835
Kickdown Switch Always ON
D
P1850
Brake Band Apply Solenoid Malfunction
D
P1860
TCC Solenoid Electrical
D
DTC TYPE
DEFINITION
C
Flashing Check Trans on 1st failure
D
No lamps
NOTE: On the following charts, refer to the Powertrain
Control Module (PCM) section for the Wiring System, and
the Body and Accessories section for circuit diagram
details, parts location, and connector configuration.
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–27
DTC P0218 Transmission Fluid Over Temperature
D07RW029
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–GRN/RED. 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 CHECK TRANS
Lamp.
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 at the transmission 16–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–GRN/RED.
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.
2. This test checks for a “skewed” sensor or shorted
circuit.
3. This test simulates a TFT DTC P0713.
7A1–28 TRANSMISSION CONTROL SYSTEM (4L30–E)
DTC P0218 Transmission Fluid Over Temperature
Step
Action
Yes
No
1
Perform the following checks:
D
Check for possible engine system problems.
D
Transmission fluid checking procedure. Refer to Checking
Transmission Fluid Level and Condition in Automatic
Transmission (4L30–E) Section.
Were the checks performed?
Go to Step 2
—
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 “Clear Info”
function is used.
3. Record the DTC “Failure Records”.
Is the TFT sensor signal voltage less than 1.54 volts?
Go to Step 3
Go to Diagnostic
Aids
3
1. Turn the ignition “off”.
2. Disconnect the transmission 16–way connector H–53
(additional DTCs may set).
Is the TFT sensor signal voltage greater than 4.92 volts?
Go to Internal
Wiring Harness
Check.
Go to Step 4
4
Inspect/repair circuit RED/BLK–GRN/RED for a short to ground.
Was a problem found?
Go to Step 6
Go to Step 5
5
1. Inspect the PCM for poor connections.
2. Replace the PCM if no poor connections were found.
Is the replacement complete?
Go to Step 6
—
6
1. After the repair is complete, use the scan tool to select “DTC”,
then “Clear Info” function and ensure the following conditions
are met:
TFT is less than 125
°
C (257
°
F) for at least 10 seconds.
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
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