chassis ISUZU TF SERIES 2004 Workshop Manual

9A1-8 RESTRAINT CONTROL SYSTEM

Circuit Description
When the ignition switch is first turned “ON”, “Ignition 1”
voltage is applied from the “SRS” fuse to the SRS
control unit at the “Ignition 1” input terminals “35”. The
SRS control unit responds by flashing the “AIR BAG”
warning lamp seven times, while performing tests on
the SRS.

Notes On System Check Chart
1.
The “AIR BAG” warning lamp should flash seven
times after ignition is first turned “ON”.
2.
After the “AIR BAG” warning lamp flashes seven
times, it should turn “OFF”
3.
This test checks for the proper operation of the
“Serial Data” line. This test will also determine
whether history diagnostic trouble codes are stored
and, if so, identify them.
4.
Improper operation of the “AIR BAG” warning lamp
is indicated. This test differentiates a warning lamp
stays “ON” condition from a warning lamp does not
come “ON” condition.
5.
This test checks for proper operation of the “Serial
Data” line. This test will also identify the stored
diagnostic trouble codes and whether they are
current or history.
Diagnostic Aids
The order in which diagnostic trouble codes are
diagnosed is very important. Failure to diagnose the
diagnostic trouble codes in the order specified may
result in extended diagnostic time, incorrect diagnosis
and incorrect parts replacement.


SRS Diagnostic System Check
Step Action Yes No
1 Note the “Air Bag” warning lamp as ignition switch is turned “ON.”
Does the “AIR BAG” warning lamp flash seven 7 times? Go to Step 2 Go to Step 3
2 Note the “AIR BAG” warning lamp after it flashed 7 times.
Does the “AIR BAG” warning lamp go “OFF”? Go to Step 4 Go to Step 5
3 Note the “AIR BAG” warning lamp as ignition switch is turned
“ON”.
Does the “AIR BAG” warning lamp come “ON” steady? Go to Chart B. Go to Chart C.
4
1.
Note the “AIR BAG” warning lamp as that ignition switch is
turned “ON.”

Ignition switch “OFF.”

2.
Connect a scan tool to data link connector.

3.
Follow direction given in the scan tool instruction manual.

Ignition switch “ON.”

4.
Request the SRS diagnostic trouble code display, recode all
history diagnostic trouble code(s). specify as such, on repair
order
Is (are) diagnostic trouble code(s) displayed? Ignition switch
“OFF.”
When DTC B1000 is
set, go to DTC
B1000 Chart.
For all other history
codes refer to
“Diagnostic Aids”
For that specific
DTC.
A history DTC
indicates the
malfunction has
been repaired or is
intermittent. SRS is functional
and free of
malfuncitons, no
further diagnosis is
required.
If scan tool indicated
“NO DATA
RECEIVED,” refer to
chassis electrical
section 8.

RESTRAINT CONTROL 9A1-9

Step Action Yes No
5
1. Ignition switch “OFF.”
2. Connect a scan tool to data link connector.

3. Follow directions as given in the scan tool instruction
manual.

4. Ignition switch “ON.”
5. Request the SRS diagnostic trouble code display, Recode
all diagnostic trouble code(s), specifying as current or history
on repair order.
Is (are) diagnostic trouble code (s) displayed? Ignition switch
“OFF”.
When DTC B0053 is
set, go to DTC
B0053 chart.
When DTC B0051 is
set, go to DTC
B0051 chart.
When DTC B0018
is set, go to DTC
B0018 chart.
When DTC B0024
is set, go to DTC
B0024 chart.
Diagnose remaining
current DTCs from
lowest to highest.
When only history
DTCs exist, refer to
“Diagnostics Aids”
for that specific
DTC.
A history DTC
indicates the
malfunction has
been repaired or is
intermittent. If scan tool indicates
“No Data Received,”
refer to chassis
electrical section 8.

RESTRAINT CONTROL 9A1-43

DTC B0057 (Flash Code 57) Passenger Pretensioner Squib Circuit Low Resistance

Step Action Yes No
1 Was the “SRS Diagnostic System Check” performed? Go to Step 2 Repeat the “SRS
Diagnostic System
Check”
2

1. Check the passenger pretensioner squib circuit for short to
valtage or short to ground.

2. If the broblem found, repair as necessary.
Was a problem found? Verify repair Go to Step 3
3

1. Ignition switch “Off.”

2. Make sure the passenger air bag assembly yellow connector
located at the base of the passenger seat.
Is the yellow connector connected properly? Go to Step 4 Seat passenger
pretensioner
assembly yellow
connector
properly.
Go to Step 7
4

1. Disconnect and inspect the passenger air bag assembly
yellow connector located at the base of the passenger seat.

2. If ok, reconnect the passenger air bag assembly connector.

3. Ignition switch “ON.”
Is DTC B0057 Current? Go to Step 5 Go to Step 7
5

1. Ignition switch “Off.”

2. Disconnect SRS coil and passenger pretensioner assembly,
yellow connector located at the base of the passenger seat.

3. Connect 5-8840-2421-0 SRS driver/passenger load tool and
appropriate adapters to passenger pretensioner assembly
harness connectors.

4. Ignition switch “ON.”
Is DTC B0057 current? Go to Step 6 Ignition switch
“Off.”
Replace the
passenger
pretensioner
assembly.
Go to Step 7
6

1. Ignition switch “Off.”

2. There has been a decrease in the total circuit resistance of
the passenger inflator deployment loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking circuits “Passenger pretensioner High” and
“Passenger Pretensioner Low”, and SRS control unit
connector terminal “44” and “43” to locate the root cause.
Was a fault found? Replace SRS
harness or repair
chassis harness.
Go to Step 7 Go to Chart A
7

1. Reconnect all components, ensure all component are
properly mounted.

2. Clear diagnostic trouble codes.
Was this step finished? Repeat the “SRS
Diagnostic System
Check” Go to Step 7

9A1-46 RESTRAINT CONTROL SYSTEM

DTC B0058 (Flash Code 58) Passenger Pretensioner Squib Circuit High Resistance

Step Action Yes No
1 Was the “SRS Diagnostic System Check” Performed? Go to Step 2 Go to The “SRS
Diagnostic System
Check”
2

1. Check the passenger pretensioner circuit for open.

2. If the problem found, repair as necessary.
Was a problem found? Verify repair Go to Step 3
3

1. Ignition switch “Off.”

2. Make sure the passenger air bag assembly yellow connector
located at the base of the passenger seat.
Is the yellow connector connected properly? Go to Step 4 Seat passenger
pretensioner
assembly yellow
connector
properly.
Go to Step 7
4

1. Disconnect and inspect the passenger pretensioner assembly
yellow connector located at the base of the passenger seat.

2. If ok, reconnect the passenger pretensioner assembly
connector.
3. Ignition switch “ON.”
Is DTC B0058 current? Go to Step 5 Go to Step 7
5

1. Ignition switch “Off.”

2. Disconnect passenger pretensioner assembly, yellow
connector located at the base of the passenger seat.

3. Connect 5-8840-2421-0 SRS driver / passenger load tool and
appropriate adapters to passenger pretensioner assembly
harness connectors.

4. Ignition switch “ON.”
Is DTC B0058 Current? Go to Step 6 Ignition switch
“Off.”
Replace the
passenger
pretensioner
assembly.
Go to Step 7
6

1. Ignition switch “Off.”

2. There has been an increase in the total circuit resistance of
the passenger loop.

3. Use the high resolution ohmmeter mode of the DVM while
checking circuits “Pasenger Pretensioner High” and
“Passenger Pretensioner Low”, and SRS control unit
connector terminal “44” and “43” to locate the root cause.
Was a fault found? Replace SRS
harness or repair
chassis harness.
Go to Step 7 Go to Chart A
7

1. Reconnect all components ensure all component are properly
mounted.

2. Clear diagnostic trouble codes.
Was This step finished? Repeat the “SRS
Diagnostic System
Check” Go to Step 7

9A1-52 RESTRAINT CONTROL SYSTEM

Step Action Yes No
4

1. Disconnect and inspect the pretensioner yellow connector
located base of the driver seat.

2. If ok, reconnect the Pretensioner assembly yellow connector.

3. Ignition switch “ON.”
Is DTC B0064 current? Go to Step 5 Go to Step 8
5

1. Ignition switch “OFF.”

2. Disconnect deive pretensioner assembly, yellow connector
located at the base of the driver seat.

3. Connect SRS driver / passenger load tool 5-8840-2421-0 and
appropriate adapter to drive pretensioner assembly harness
connectors.

4. Ignition switch “ON.”
Is DTC B0064 current? Go to Step 6 Go to Step 7
6

1. Ignition switch “OFF.”

2. There has been a decrease in the total circuit resistance of
the driver deployment loop.

3. Use the high resolution ohmmeter mode of the DVM while
checking circuits “Driver Pretensioner High” and “Driver
Pretensioner Low”, and SRS control unit connector terminal
“42” and “41” to locate the root cause.
Was a fault found? Replace SRS
harness or repair
chassis harness.
Go to Step 8 Go to Chart A
7

1. Ignition switch “OFF.”

2. Disconnect SRS driver / passenger load tool from driver
pretensioner assembly harness connector.
3. Connect SRS driver / passenger load tool 5-8840-2421-0 to
the top of steering column connector.

4. Reconnect pretensioner harness connector as the base of the
driver seat.

5. Ignition switch “ON.”
Is DTC B0064 current? Ignition switch
“off.”
Replace SRS coil
assembly.
Go to Step 8 Ignition switch
“OFF.”
Replace driver
pretensioner
assembly.
Go to Step 8
8

1. Reconnect all components, ensure all component are
properly mounted.

2. Clear diagnostic trouble codes.
Was this step finished? Go to the “SRS
Diagnostic System
Check” Go to Step 8

RESTRAINT CONTROL 9A1-57

DTC Will Clear When
The malfunction is no longer occurring and the ignition
is turned “OFF”.

DTC Chart Test Description
Number(s) below refer to step number(s) on the
diagnostic chart:
2.
This test determines whether the SRS control unit is
malfunctioning
3.
This test isolates the malfunction to one side of the
pretensioner assembly yellow connector at the base
of the driver seat.
4.
This test determines whether the malfunction is in
“Driver Pretensioner High” circuit.
5.
This test determines whether the malfunction is in
“Driver Pretensioner Low” circuit.
6.
This test determines whether the malfunction is in
“Driver Pretensioner High” circuit.
7.
This test determines whether the malfunction is in
“Driver Pretensioner Low” circuit.
8.
This test determines whether the malfunction is in
the driver pretensioner assembly.
Diagnostic Aids
An intermittent condition is likely to be caused by a short
to ground/+B in the driver pretensioner circuit. Inspect
circuits “Driver Pretensioner High” and “Driver
Pretensioner Low” carefully for cutting or chafing.


DTC B0066 (Flash Code 66) Driver Pretensioner Squib Circuit Voltage Range/Performance

Step Action Yes No
1 Was the “SRS Diagnostic System Check” performed? Go to Step 2 Go to the “SRS
Diagnostic System
Check”
2

1. When measurements are requested in this chart use 5-8840-
0285-0 DVM with correct terminal adapter from 5-8840-
0385-0.

2. Ignition switch “OFF.”
3. Ignition switch “ON.”

4. Check the driver pretensioner squib circuit for short to
voltage, short to ground and open.
Was a problem found? Verify repair Go to Step 3
3

1. Ignition switch “OFF.”

2. Disconnect pretensioner yellow connector located at base of
the driver seat. leave passenger pretensioner assembly
connected.

3. Connect SRS driver / passenger load tool 5-8840-2421-0 and
appropriate adapter to pretensioner harness connector.

4. ignition switch “ON.”
Is DTC B0066 current? Go to Step 4 Go to Step 8
4

1. Ignition switch “OFF.”

2. Disconnect SRS control unit.
3. Disconnect SRS driver / passenger load tool.

4. Measure resistance on SRS control unit harness connector
“42” to terminal “40” (ground).
Does 5-8840-0285-0 display “OL” (infinite)? Go to Step 5 Replace SRS
harness or repair
chassis harness.
Go to Step 9

9A1-58 RESTRAINT CONTROL SYSTEM

Step Action Yes No
5 Measure resistance on SRS control unit harness connector from
terminal “41” to terminal “40” (ground).
Does 5-8840-0285-0 display “OL” (infinite)? Go to Step 6
Replace SRS
harness.
Go to Step 9
6 Measure resistance on SRS control unit harness connector from
terminal “42” to terminal “35” (ignition).
Does 5-8840-0285-0 display “OL” (infinite)? Go to Step 7
Replace SRS
harness or repair
chassis harness.
Go to Step 9
7 Measure resistance on SRS control unit harness connector from
terminal “41” to terminal “35” (ignition).
Does 5-8840-0285-0 display “OL” (infinite)? Go to Chart A
Replace SRS
harness or repair
chassis harness.
Go to Step 9
8

1. Ignition switch “OFF.”

2. Disconnect SRS driver / passenger load tool 5-8840-2421-0
from pretensioner assembly harness connector.

3. Connect SRS driver / passenger load tool 5-8840-2421-0 and
appropriate adapter to driver pretensioner assembly harness
connector.

4. Reconnect pretensioner harness connector as the base of the
driver seat.

5. Ignition switch “ON.”
Is DTC B0066 current? Go to Step 9
Ignition switch
“OFF.”
Replace driver
pretensioner
assembly.
Go to Step 9
9

1. Reconnect all components ensure all component are properly
mounted.

2. Clear diagnostic trouble codes.
Was this step finished? Go to the “SRS
Diagnostic System
Check” Go to Step 9

PROPELLER SHAFT 4A-19
Front Propeller Shaft

Removal and Installation



RTW34AMF000301

Legend
(1) Bolt, Nut and Washer (Front Axle Side)
(2) Front Propeller Shaft
(3) Nut and Washer (Transfer Side)


401RS020
Removal
1. Jack up the vehicle and support it on the chassis stands.
2. Gear shift lever should be placed in neutral position and
parking brake released.
3. Remove the exhaust and transfer protectors.
NOTE:
Apply alignment marks on the flange at the front propeller shaft
both front and rear side.
4. Remove bolt, nut and washer (Front axle side).
5. Remove bolt, nut and washer (Transfer side).
6. Remove front propeller shaft.

4B-10 REAR AXLE

Disassembly

Raise vehicle to the working level.

Support the axle assembly with the proper jack
and chassis stands.

Remove wheel and tire.

Drain differential oil.

Remove propeller shaft. (Refer to the section
“Rear Propeller Shaft”.)

1.
Remove brake drum.
2. Remove ABS sensor. (Refer to the section “ABS”.)
3. Remove brake pipe from wheel cylinder.
420R300003

5A-14 BRAKE CONTROL SYSTEM


No. Connector face No. Connector face
H-15
White
Engine Room ~ Chassis


H-18
White
Engine Room ~ INST


P-2
Silver
Relay & Fuse Box


P-6
Silver
Body Earth (Ground)


P-10
Silver
Engine Ground


R-15
Black
2-4WD Control Unit