ISUZU AXIOM 2002 Service Repair Manual

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±32
Tech 2 Scan Tool
From 98 MY, Isuzu dealer service departments are
recommended to use Tech 2. Please refer to Tech 2 scan
tool user guide.
901RW257
Legend
(1) PCMCIA Card
(2) SAE 16/19 Adaptor(3) DLC Cable
(4) Tech 2

4B2±33
DRIVE LINE CONTROL SYSTEM (TOD)
Getting Started

Before operating the Isuzu PCMCIA card with the
Tech 2, the following steps must be performed:
1. The Isuzu 02 System PCMCIA card (1) inserts into
the Tech 2 (4).
2. Connect the SAE 16/19 adapter (2) to the DLC cable
(4).
3. Connect the DLC cable to the Tech 2 (4)
4. Mark sure the vehicle ignition is off.
5. Connect the Tech 2 SAE 16/19 adapter to the vehicle
DLC connector.
826R200011
6. The vehicle ignition turns on.
7. Power up the Tech 2.
8. Verify the Tech 2 power up display.
060RW009
Operating Procedure
The power up screen is displayed when you power up the
tester with the Isuzu systems PCMCIA card. Follow the
operating procedure below.
060R100102

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±34
060R200079

4B2±35
DRIVE LINE CONTROL SYSTEM (TOD)
Diagnostic Trouble Codes
CodeTech 2 code
(P code)ItemDiagnosisCheck flow No.
12ÐStart codeNormalÐ
13P1735RefShorted GND6
14P1731Front speed sensorInput abnormality (open, sig or com)2
15P1736RefShorted VB6
16P1737Front speed sensorInput abnormality4
17P1774Inhibitor switchInput abnormality8
21P1716TPSShorted or disconnected wiring,
abnormality in input7
23ÐECUCPU abnormality1
24P1733Rear speed sensorInput abnormality (open, sig or com)3
27P1738Rear speed sensorInput abnormality5
28P1760ADC (+) & AXLE SWOutput abnormality10
31P1721EMC (+)Shorted VB, disconnected coil/wiring or
shorted GND9
32P1761ADC (+)Shorted VB or disconnected wiring11
33P1762ADC (+)Shorted GND12
36ÐECUCPU abnormality1
37P1712ECUCPU abnormality1
38P1714ECUCPU abnormality1
41P1741Hight-Low shift motorShorted GND or disconnected wiring13
42P1773Hight-Low shift motorUser operation error (not failure)14
43P1743Hight-Low shift motorMotor moving more than 5s15
55P1755Hight-Low shift motorInput abnormality of motor position signal16
TPS : Throttle Position Sensor
EMC : Electromagnetic coil
ADC : Shift on the fly (Axle Dis Connect)

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±36
Diagnosis from Trouble Codes

Diagnose the fault that have been saved to the control
unit according to the system self-diagnostic function.
Check flow
Trouble codePhenomenonStandard
1 23, 36, 37, 38The ECU has failed.Ð
P1712, P1714
StepActionYe sNo
1Turn on the starter switch.
Is the trouble reproduced?Replace the ECU
and conduct the
test run.
Go to
Step 3Go to Step 2
21. Clear the trouble codes.
2. Conduct the test run.
Is the trouble reproduced during the test run?
Replace the ECU
and conduct the
test run.
Go to
Step 3
The trouble is not
reproduced.
Refer to
ªTrouble
intermittently
observedº.
Go to Step 3
31. Check that all the parts are mounted.
2. Clear the trouble codes.
Is this step complete?
Verify the repair.Return to Step 3

4B2±37
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
214Front speed sensor signal open or
GND short speed sensor com
0.2V > sensor voltage
P1731GND short, s eed sensor com
open.
NOTE: The following procedure shows the case that the
front or rear sensor common grounding line is broken.
D04R200005

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±38
StepActionYe sNo
11. Start the engine.
2. Select TOD mode.
Is there the memory except DTC 14(P1731)?
Go to Step 4Go to Step 2
21. Turn off the starter switch.
2. Disconnect the ECU connector (C±38) and (C±37).
Is there the continuity between (C±37) terminal 10 and 25?
Repair the circuit.
Go to
Step 7Go to Step 3
31. Disconnect the transfer connector (A±1).
Is there the continuity between the connector (C±37) terminal 10
and the connector (A±1) terminal 6, the connector (C±38) terminal
12 and connector (A±1) terminal 2, and the connector (C±38)
terminal 13 and connector (A±1) terminal 10?
Replace the front
speed sensor.
Go to
Step 7
Repair the circuit.
Go to
Step 7
4Is the memory DTC 24(P1733)?
Go to Step 5
Refer to other
trouble check
flow.
5Is there the continuity between harnesses of terminal 32 and 45
(vehicle side terminal of the front and rear speed sensor)?
Go to Step 6
Repair the circuit.
Go to
Step 7
6Is there the continuity between harnesses of terminal 12 and 13
(vehicle side terminal of the speed sensor COM(±) and ref)?Replace front and
rear speed
sensor.
Go to
Step 7
Repair the circuit.
Go to
Step 7
71. Check that all the parts are mounted.
2. Clear the trouble code.
Is the step complete?
Verify the repair.Return to Step 7

4B2±39
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
324Rear speed sensor signal open or
GND short speed sensor COM
0.2 V > sensor voltage
P1733GND short, s eed sensor COM
open.
NOTE: The following procedure shows the case that the
front or rear sensor common grounding line is broken.
D04R200005

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±40
StepActionYe sNo
11. Start the engine.
2. Select TOD mode.
Is there the memory except DTC 24(P1733)?
Go to Step 4Go to Step 2
21. Turn off the starter switch.
2. Disconnect the ECU connector (C±38) and (C±37).
Is there the continuity between the connector (C±37) terminal 23
and 25?
Repair the circuit.
Go to
Step 7Go to Step 3
31. Disconnect the transfer connector (A±1).
Is there the continuity between the connector (C±37) terminal 23
and the connector (A±1) terminal 5, the connector (C±38) terminal
12 and connector (A±1) terminal 1, and the connector (C±38)
terminal 13 and connector (A±1) terminal 9?
Replace the rear
speed sensor.
Go to
Step 7
Repair the circuit.
Go to
Step 7
4Is the memory DTC 14(P1731)?
Go to Step 5
Refer to other
trouble cheek
flow.
5Is there the continuity between harnesses of terminal 32 and 45
(vehicle side terminal of the front and rear speed sensor)?
Go to Step 6
Repair the circuit
Go to
Step 7
6Is there the continuity between harnesses of terminal 12 and 13
(vehicle side terminal of the speed sensor COM(±) and ref)?Replace front and
rear speed
sensor.
Go to
Step 7
Repair the circuit.
Go to
Step 7
71. Check that all the parts are mounted.
2. Clear the trouble code.
Is the step complete?
Verify the repairReturn to Step 7

4B2±41
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
416The front speed sensor no pulse.Hi level : 4.5 ~ 6.0 V
Lo level : 0.7 ~ 2.0 V
P1737Frequency (F) =
700-850 Hz (at 50 km/h or 31 mph)
NOTE: Find the trouble in which the pulse corresponding
to the running speed is not input.
D04R200005