ISUZU AXIOM 2002 Service Repair Manual

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±42
StepActionYe sNo
11. Connect TECH 2.
While running in TOD mode, does TECH±2's front speed sensor
indication change with vehicle speed?
Go to Step 2
Repair and
inspection front
speed sensor
tone wheel.
Go to
Step 6
21. Clear the trouble code.
While running at 40 km/h or 25 mph in TOD mode for 30
consecutive sec, is the trouble code reissued?
Go to Step 3
The trouble is not
reproduced.
Refer to
ªTroubles
intermittently
observedº.
31. 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 10
and 25?
Repair the circuit.
Go to
Step 6Go to Step 4
41. 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 5
Repair the circuit.
Go to
Step 5
51. Clear the trouble code.
While running at 40 km/h or 25 mph in TOD mode for 30
consecutive sec, is the trouble code reissued?
Replace ECU.
Go to
Step 6Go to Step 6
61. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
ªDiagnosis Flowº.
Return to Step 6

4B2±43
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
527The rear speed sensor no pulse.Hi level : 4.5 ~ 6.0 V
Lo level : 0.7 ~ 2.0 V
P1738Frequency (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

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±44
StepActionYe sNo
11. Connect TECH 2.
While running in TOD mode, does TECH±2's rear speed sensor
indication change with vehicle speed?
Go to Step 2
Repair and
inspection front
speed sensor
tone wheel.
Go to
Step 6
21. Clear the trouble code.
While running at 40 km/h or 25 mph in TOD mode for 30
consecutive sec, is the trouble code reissued?
Go to Step 3
The trouble is not
reproduced.
Refer to
ªTroubles
intermittently
observedº
.
31. 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 5Go to Step 4
41. 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 5
Repair the circuit.
Go to
Step 5
51. Clear the trouble code.
While running at 40 km/h or 25 mph in TOD mode for 30
consecutive sec, is the trouble code reissued?
Replace ECU.
Go to
Step 6Go to Step 6
61. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
ªDiagnosis Flowº.
Return to Step 6

4B2±45
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
613 (P1735)The reference is short-circuited to
GND.Reference
5 V
15 (P1736)The reference is short-circuited to
VB.
If the reference wire (12) is short-circuited to GND, the
speed signal is not generated. If the wire is short-circuited
to the battery voltage, the signal level becomes faulty.
D04R200005

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±46
StepActionYe sNo
11. Start the engine.
Does the voltage between terminals 12 and 47 meet the standard
5V?Refer to ªTrouble
intermittently
observedº.
Go to Step 2
2Is the voltage below the standard?Go to Step 3Go to Step 7
31. Turn off the starter switch.
2. Disconnect the ECU connector.
Is the continuity established between vehicle harness terminals
(C±38)12 and (C±37)25?
Go to Step 4
The ECU is
failed. Replace
the ECU.
Go to
Step 8
41. Disconnect the H-7 connector.
Is the continuity established between floor harness connector
terminals (H-7)2 and (H-7)15?
Go to Step 5
Short to GND
between
(C±38)12 and
(H±7)2.
Repair the circuit.
Go to
Step 8
51. Disconnect the A-1 connector.
Is the continuity established between transfer harness connector
male terminals (A±1)1 and (A±1)7?
Replace the rear
speed sensor.
Go to
Step 8
The reference
harness for the
rear speed
sensor is
short±circuited to
GND. Repair the
circuit.
Go to
Step 6
61. Disconnect the A-1 connector.
Is the continuity established between transfer harness connector
terminals (A±1)2 and (A±1)7?
Replace the front
speed sensor.
Go to
Step 8
The reference
harness for the
rear speed
sensor is
short±circuited to
GND. Repair the
circuit.
Go to
Step 8
71. Turn off the starter switch.
2. Disconnect the ECU connector.
3. Turn on the starter switch.
Is the battery voltage observed between harness connector
terminals (C±38)12 and (C±37)25?
Repair the circuit.
Go to
Step 8
The ECU has
failed. Replace
the ECU.
Go to
Step 8
81. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
ªDiagnosis Flowº
Go to Step 8

4B2±47
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
721 (P1716)The voltage of the throttle position
sensor (TPS) is faulty.See below table.
NOTE: The signal voltage from the TPS deviates from
the standard range.
D04R200025

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±48
D04RY00012

4B2±49
DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn off the starter switch.
Is the battery voltage normal?
Go to Step 2
Charge or
replace the
battery.
Go to
Step 7
21. Turn on the starter switch.
Does the voltage between terminals 15 and 47 fall within the
standard range?
Go to Step 3Go to Step 4
31. Clear the trouble code.
2. Turn on the starter switch.
Is there DTC21 (P1716)?
Go to Step 4
Refer to ªTrouble
intermittently
observedº.
41. Turn off the starter switch.
2. Disconnect the ECU connector.
3. Turn on the starter switch.
Does the voltage between terminals (C±38)15 and (C±37)25 fall
within the standard range above?
The ECU has
failed. Replace
the ECU.
Go to
Step 7Go to Step 5
5Is the harness healthy?
Go to Step 6
Repair the
harness.
Go to
Step 7
6Is the TPS healthy?
Go to Step 7
Replace the TPS.
Go to
Step 7
71. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
ªDiagnosis Flowº.
Go to Step 7

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±50
Check flowTrouble codePhenomenonStandard
817 (P1774)The input from the mode switch is
abnormal.Ð
D04R200025

4B2±51
DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
1Is the TOD control unit the regular part? (Verity the part number.)
Go to Step 2
Replace with the
regular part.
Go to
Step 2
21. Turn on the starter switch.
Does the voltage between the terminal 28 and 47 accord with the
table 1 corresponding to the AT selector positions?
Go to Step 3Go to Step 5
3Does the voltage between the terminal 41 and 47 accord with the
table 1 corresponding to the AT selector positions?
Go to Step 4Go to Step 6
4Does the voltage between the terminal 27 and 47 accord with the
table 1 corresponding to the AT selector positions?Refer to ªTrouble
intermittently
observedº.
Go to Step 7
51. Disconnect the AT mode connector (E±41).
Does the continuity between the inhibitor switch terminal 5 (D)
and 8 (A) accord with the table 2 corresponding to the AT selector
positions?Repair the circuit
between the
connector
terminal (C±37) 6
and (E±41) 8.
Go to
step 8
Replace the
inhibitor switch.
Go to
Step 8
61. Disconnect the AT mode connector (E±41).
Does the continuity between the inhibitor switch terminal 5 (D)
and 7 (B) accord with the table 2 corresponding to the AT selector
positions?Repair the circuit
between the
connector
terminal (C±37)
19 and (E±41) 7.
Go to
Step 8
Replace the
inhibitor switch.
Go to
Step 8
71. Disconnect the AT mode connector (E±41).
Does the continuity between the inhibitor switch terminal 5 (D)
and 6 (C) accord with the table 2 corresponding to the AT selector
positions?Repair the circuit
between the
connector
terminal (C±37) 5
and (E±41) 6.
Go to
Step 8
Replace the
inhibitor switch.
Go to
Step 8
81. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Verify the repair.Go to Step 8