2002 ISUZU AXIOM ignition

7A1±76
TRANSMISSION CONTROL SYSTEM (4L30±E)
Diagnostic Aids

Inspect the wiring for poor electrical connection at the
PCM and at the 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.

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:
3. This test checks for power to the brake band apply
solenoid from the ignition through the PCM.
4. This test checks the resistance of the transmission
internal wiring harness and brake band apply
solenoid.
5. This test checks the ability of the PCM and wiring to
control the ground circuit.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±77
DTC P1850 Brake Band Apply Solenoid Malfunction
StepActionYe sNo
1Were you sent here from the ªPowertrain On±Board Diagnostic
(OBD) System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emission in
Engine section
21. Install the scan tool.
2. With the engine ªonº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when the ªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
Were DTCs P0753, P0758 set?
Go to Step 3Go to Step 4
3Using the J39200 DVOM, back probe between PCM connector
terminals E35±43 and E35±1.
Is the voltage between 10 to 12 volts?
Go to Step 5Go to Step 6
41. Turn the ignition ªoffº.
2. Disconnect the E-34 (BLUE) and E-35 (RED) PCM connector.
3. Using the J39200 DVOM, measure the resistance between
PCM connector terminals E35±43 and E35±10.
Is the resistance within 10±12 ohms?
Go to Step 10Go to Step 11
5Using the J39200 DVOM, back probe between PCM connector
terminals E35±10 and E35±1.
Is the voltage between 10 to 12 volts?
Go to Step 19Go to Step 4
61. Turn the ignition ªoffº.
2. Disconnect the E-34 (BLUE) and E-35 (RED) PCM connector.
3. Using the J39200 DVOM, check continuity between PCM
terminal E35±43 and ground.
Is there a continuity?
Go to Step 7Go to Step 8
71. Disconnect the transmission main case connector E-42.
2. Using the J39200 DVOM, check continuity between the
terminal E42±7(B) and ground.
Is there continuity?
Go to Step 13Go to Step 14
81. Disconnect the E-34 (BLUE) and E-35 (RED) PCM Connector.
2. Using the J39200 DVOM, measure the resistance between
the PCM connector terminals E35±43 and E35±10.
Is the resistance within 10±12 ohms?
Go to Step 19Go to Step 9
91. Disconnect the transmission main case connector E-42.
2. Using the J39200 DVOM, measure the resistance between
the terminals E42±7(B) and E42±2(D).
Is the resistance within 10±12 ohms?
Go to Step 15Go to Step 16
10Using the J39200 DVOM, check continuity between PCM
terminal E35±10 and ground.
Is there continuity?
Go to Step 12Go to Step 19
111. Disconnect the transmission main case connector E-42.
2. Using the J39200 DVOM, measure the resistance between
the terminals E42-7(B) and E42-2(D).
Is the resistance within 10±12 ohms?
Go to Step 18Go to Step 16

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±79
DTC P1860 TCC PWM Solenoid Electrical
D07R200011
Circuit Description
The PCM allows current to flow through the solenoid coil
according to the duty cycle (percentage of ªonº and ªoffº
time). This current flow through the solenoid coil creates
a magnetic field that magnetizes the solid core. The
magnetized core attracts the check ball to seat against
spring pressure. This blocks the exhaust for the TCC
signal fluid and allows 2±3 drive fluid to feed to TCC signal
circuit.The TCC signal fluid pressure acts on the TCC
regulator valve to regulate line pressure and to apply fluid
pressure to the torque converter clutch shift control valve.
When the TCC shift valve is in the apply position,
regulated apply fluid pressure is directed through the TCC
valve to apply the torque converter clutch. The TCC
PWM solenoid is used in conjunction with the TCC PWM
solenoid to regulate fluid to the torque converter. The
TCC PWM solenoid is attached to the valve body within
the transmission.
This DTC detects a continuous open or short to ground or
ignition in the TCC circuit or the TCC PWM solenoid. This
is a type ªBº DTC.
Conditions For Setting The DTC

Battery voltage is between 10 and 16 volts.

No shift solenoid A DTCs P0751 or P0752 or P0753.

No shift solenoid B DTCs P0756 or P0757 or P0758.

Ignition is ªonº, Engine ªrunº.

The PCM commands the solenoid ªonº and the
voltage remains low (zero volts).

The PCM commands the solenoid ªoffº and the
voltage remains high (B+).

All conditions met for 0.875 ~ 1.25 seconds.
Action Taken When The DTC Sets

Inhibit TCC engagement.
For lamp illuminate refer to
DTC type definition (type
B).
Conditions For Clearing The MIL/DTC

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

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

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

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.
Diagnostic Aids

Inspect the wiring for poor electrical connections at
the PCM and at the transmission 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.

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
:
3. This test checks for voltage to the solenoid.
4. This test checks the ability of the PCM and wiring to
control the ignition circuit.
9. This test checks the resistance of the TCC solenoid
and the internal wiring harness.

7A1±80
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P1860 TCC PWM Solenoid Electrical
StepActionYe sNo
1Were you sent here from the ªPowertrain On±Board Diagnostic
(OBD) System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emission in
Engine section
21. Install the scan tool.
2. With the engine ªonº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when theªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
Was DTC P1860 set?
Go to Step 3Go to Step 4
3Using the J39200 DVOM, back probe between PCM connector
terminals E35±51 and E35±33.
Is the voltage 0?
Go to Step 5Go to Step 6
41. Apply brake pedal and select transmission range ªDº.
2. Do a test drive, and increase the vehicle speed to TCC ªonº at
4th.
Does the scan tool display DTC P1860 at TCC ªONº?
Go to Step 9
Go to Diagnostic
Aids
51. Turn the ignition ªoffº.
2. Disconnect the E-35 (RED) PCM connector.
3. Using the J39200 DVOM, measure the resistance between
PCM connector terminals E35±51 and E35±33.
Is the resistance within 18 ± 20 ohms?
Go to Step 7Go to Step 8
6The wiring harness between PCM connector terminal E35±51
and transmission adapter case connector terminal E40±1(A) is
shorted to voltage.
Was a problem found and corrected?
Go to Step 15Go to Step 16
7Intermittent condition.
Check the wiring harness and terminals between PCM connector
J2 and transmission adapter case connector E±40.
Was a problem found and corrected?
Go to Step 15Go to Step 16
81. Disconnect the transmission adapter case connector E±40.
2. Using the J39200 DVOM, measure the resistance between
terminal E40±1(A) and ground.
Is the resistance within 18 ± 20 ohms?
Go to Step 13Go to Step 14
91. Turn the ignition ªoffº.
2. Disconnect the E-35 (RED) PCM connector.
3. Using the J39200 DVOM, measure the resistance between
terminals E35±51 and E35±33.
Is the resistance within 18 ± 20 ohms?
Go to Step 15Go to Step 10
101. Disconnect the transmission adapter case connector E±40.
2. Using the J39200 DVOM, measure the resistance between
terminal E40±1(A) and ground.
Is the resistance within 18±20 ohms?
Go to Step 11Go to Step 12
11The wiring harness between PCM connector E-35 and adapter
case connector E-40 is shorted to ground.
Was a problem found and corrected?
Go to Step 17Ð

7A1±82
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P1870 Transmission Component Slipping (TCC Stuck Off)
D07R200008
Circuit Description
The PCM monitors the difference in engine speed and
transmission output speed. For example in D3 drive
range with the ECCC commanded, the engine speed
should closely match transmission output speed.
This DTC detects excessive TCC slip when the ECCC is
engaged. This is a type ªBº DTC.
Conditions For Setting The DTC
The following conditions are met for three TCC cycles
with reported excessive TCC slip conditions.

No OSS DTCs P0722 or P0723.

No shift solenoid A DTCs P0751 or P0752 or P0753.

No shift solenoid B DTCs P0756 or P0757 or P0758.

No TCC solenoid DTCs P0742 or P1860 or P1870.

Engine speed is between 1,000 and 3,500 rpm for 0.5
seconds.

Gear range is D4.

13% < TPS < 99%

50 < Engine Torque < 300 N´m

TFT is between 20
and 150
C (68
and 302
F).

TCC slip speed is between 250 rpm and 800 rpm for 3
times 7 seconds.

Vehicle speed is between 25 km/h (15 mph) and 225
km/h (158 mph).

Speed ratio is between 0.6 and 0.95.

ECCC is ªONº.
Low (0.8) < TCC Capacity < hi (0.99) for 5 seconds
Action Taken When The DTC Sets

Only stored in memory.

For lamp illuminate refer to
DTC type definition (type
B).
Conditions For Clearing The MIL/DTC

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

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

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

The PCM will cancel the DTC default actions when
the fault no longer exist and the ignition is cycled ªoffº
long enough to power down the PCM.
Diagnostic Aids

Range switch malfunction could set a DTC P1870.

A mechanical failure of the shift solenoids, TCC
solenoid, or TCC PWM solenoid could set a DTC
P1870.

Internal transmission failures may set a DTC P1870.

An intermittent or incorrect engine speed signal may
set a DTC P1870.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±83
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
2. This test checks the indicated range signal to the
actual selected range. A faulty switch could set a
DTC P1870.
3. This test checks the torque converter for slippage
while in a commanded lockup state.Range Switch Logic Table
RangeRange Switch Ping
PositionABCP(G)
ParkONOFFOFFON
ReverseONONOFFOFF
NeutralOFFONOFFON
D4OFFONONOFF
D3ONONONON
2ONOFFONOFF
LOFFOFFONON
IllegalOFFOFFOFFOFF
IllegalOFFOFFOFFON
DTC P1870 Transmission Component Slipping (TCC Stuck Off)
StepActionYe sNo
1Were you sent here from the ªPowertrain On±Board Diagnostic
(OBD) System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Engine section
21. Install the scan tool.
2. With the engine ªoffº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when the ªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
4. Apply the brake pedal.
5. Select each transmission range: DL, D2, D3, D4, N, R, and P.
Does each selected transmission range match the scan tool ªTR
Switchº display?
Go to Step 3
Go to ªRange
Switch Logic
Tableº
3Drive the vehicle in 4th gear while the TCC is engaged.
At any time is the ªTCC Slip Speedº greater than 130 rpm for 8
seconds while the TCC is engaged?
Go to System
Diagnosis ChartsGo to Diagnostic
Aids

ENTERTAINMENT8C±15
Audio Self-Diagnosis
StepActionValue(s)Ye sNo
11. Simultaneously press and hold the RESET key and
the CLOCK key (on the display panel).
2. Turn the ignition switch to the ON position.
Does DIAG appear on the display screen?
ÐGo to Step 2
Check power
supply and
component
connections.
Start
self-diagnosis
again.
2Press and release the SERVICE key (1 time only).
Does DIAG AUDIO appear on the display?
ÐGo to Step 3Go to Step 11
3Press and release the SERVICE key (1 time only) to
check tape connections.
Does TAPE OK appear on the display?
ÐGo to Step 4
On NG display,
Go to
Step 11
4Press and release the SERVICE key (1 time only) to
check CD changer connections.
Does CD CHG OK appear on the display?
ÐGo to Step 5
On NG display,
Go to
Step 11
5Press and release the SERVICE key (1 time only) to
check communication with A/C unit.
Does A/C DATA OK appear on the display?
ÐGo to Step 9
On NG display,
Go to
Step 6
6Is A/C DATA ERR1(abnormal display data line)
displayed?
Ð
Refer to A/C
self-diagnosis
Go to Step 7
7Is A/C DATA ERR2 (abnormal CLOCK data line)
displayed?
Ð
Refer to A/C
self-diagnosis
Go to Step 8
8Is A/C DATA ER3 (abnormal SW data line) displayed?ÐGo to Step 11Ð
9Press and release the SERVICE key (1 time only) to
display the A/C unit error history.
Is the action complete?
ÐGo to Step 10Ð
101. Press and release the SERVICE key (1 time only) to
change to the key diagnosis mode.
2. Press and release each key.
NOTE: As a key is pressed, its name should appear on
the display. The A/C LED should blink at 1±second
intervals.
Did the events described in Step 2 occur?
ÐGo to Step 12Go to Step 11
11Replace the audio unit.
Is the action complete?
ÐGo to Step 1Ð
12Press and release the ON/OFF key.
Is the action complete?
ÐGo to Step 1Go to Step 13
13Press and release the SERVICE key (1 time only).
Is the action complete?
ÐGo to Step 3Ð

8C±16ENTERTAINMENT
Display Self-Diagnosis
StepActionValue(s)Ye sNo
11. Simultaneously press and hold the RESET key and
the CLOCK key (on the display panel).
2. Turn the ignition switch to the ON position.
Does DIAG appear on the display screen?
ÐGo to Step 2
Check power
supply and
component
connections.
Start
self-diagnosis
again.
2Press and release the RESET key (1 time only).
Does DIAG DISP appear on the display?
ÐGo to Step 3Go to Step 10
3Press and release the RESET key (1 time only) to start
audio communications diagnosis.
Does AUD DAT OK appear on the display?
ÐGo to Step 5
On NG display,
Go to
Step 4
4Replace the audio unit.
Is the action complete?
ÐGo to Step 1Ð
51. Press and release the RESET key (1 time only).
2. Confirm that the trouble history is displayed on the
screen.
Is the trouble history displayed?
ÐGo to Step 6Ð
6Press and release the RESET key (1 time only) to start
MID communications diagnosis.
Does MID DATA OK appear on the display?
ÐGo to Step 8
On NG display,
Go to
Step 7
7Replace the MID unit.
Is the action complete?
ÐGo to Step 1Ð
81. Press and release the RESET key (1 time only) to
display MID communications error history.
2. Confirm that the error history is displayed on the
screen.
Is the error history displayed?
ÐGo to Step 9Ð
9Press and release the RESET key (1 time only) to open
all segments.
Do all segments light?
ÐGo to Step 11Go to Step 10
10Replace the display unit.
Is the action complete?
ÐGo to Step 1Ð
11Press and release the ON/OFF key to complete display
self-diagnosis.
Is the action complete?
ÐGo to Step 1Go to Step 12
12Press and release the SERVICE key.
Is the action complete?
ÐGo to Step 3Ð