2004 ISUZU TF SERIES immobilizer

6E-282 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
10

Using the DVM and check the VSS signal.
1. Ignition "On", vehicle "Run (lift up)".
2. Measure the VSS output voltage at sensor, meter,
immobilizer control unit (if equipped) and ECM.
Does the tester indicate specified value?

Measurement Position Voltage (V) (AC Range) If No Good
VSS terminal 3 & GND Go to Step 11
Meter B24 connector 9 & GND Go to Step 15
Meter B24 connector 10 & GND Go to Step 17Immobilizer control unit B68 connector 6 & GND
Approximately 6.0 V at 20km/h
Go to Step 18 Immobilizer control unit B68 connector 8 & GND Go to Step 20
ECM E-61 connector 32 & GND
Approximately 4.0 V at 20km/hGo to Step 21
If a oscilloscope is available, monitor the VSS signal.
Does the oscilloscope indicate correct wave form?

Vehicle Speed Sensor (VSS) Reference Wave Form








CH1
0V


CH2
0V




Measurement Terminal: CH1: ECM B32(+) / CH2: VSS 3(+)
GND(-)
Measurement Scale: CH1: 10V/div / CH2: 10V/div 50ms/div
Measurement Condition: Approximately 20km/h
Note: The vehicle is without immobilizer system,
CH1 signal is same as CH2.


-

Refer to
Diagnostic Aids
and Go to Step
25

Refer the table
11
Using the DVM and check the VSS power supply
circuit.

1. Ignition "On", engine "Off".
2. Disconnect the VSS connector.
3. Check the circuit for open or short to ground circuit.
Was the DVM indicated specified value?
E-44
V




10-14.5V
Go to Step 13
Go to Step 12

6E-284 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
16
Using the DVM and check the VSS signal circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the VSS connector and meter
connector.
3. Check the circuit for open or short to ground circuit.
If a open or short to ground circuit is found, repair
the faulty harness and verify repair.
Is the action complete?
E-44




B-24



-
Verify repair
-
17
Replace the speed meter.
Is the action complete?
- Verify repair -
18
Using the DVM and check the VSS signal circuit.
1. Ignition "On", engine "Off".
2. Disconnect the meter connector and immobilizer
control unit connector (if equipped).
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
B-24
B-68
VV





Less than 1V
Go to Step 19
Repair faulty
harness and
verify repair

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-285
Step Action Value (s) Yes No
19
Using the DVM and check the VSS signal circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the meter connector and immobilizer
control unit connector (if equipped).
3. Check the circuit for open or short to ground circuit.
If a open or short to ground circuit is found, repair the
faulty harness and verify repair.
Is the action complete?
B-24
B-68






-
Verify repair
-
20
Replace the immobilizer control unit (if equipped).
Is the action complete?
- Verify repair -
21
Using the DVM and check the VSS signal circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the immobilizer control unit connector (if
equipped) and ECM connector.
3. Ignition "On".
4. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
B-68
V


E-61(B)
V



Less than 1V
Go to Step 22
Repair faulty
harness and
verify repair

6E-286 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
22

Using the DVM and check the VSS signal circuit.
Breaker box is available:
1. Ignition "Off", engine "Off".
2. Install the breaker box as type A (ECM
disconnected).
Refer to 6E-95 page.
3. Disconnect the immobilizer control unit connector (if
equipped).
4. Check the circuit for open or shot to ground circuit.
Was the problem found?
B32
Breaker Box


B-68






Breaker box is not available:
1. Ignition "Off", engine "Off".
2. Disconnect the immobilizer control unit connector (if
equipped) and ECM connector.
3. Check the circuit for open or short to ground circuit.
Was the problem found?
E-61(B)
B-68










-

Repair faulty
harness and
verify repair

Go to Step 25
23
Substitute a known good VSS and recheck.
Was the problem solved?
- Go to Step 24 Go to Step 25
24
Replace the VSS.
Was the problem solved?
- Verify repair Go to Step 25
25
Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the "SPS (Service Programming System)".
Was the problem solved?
- Verify repair Go to Step 26

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-287
Step Action Value (s) Yes No
26
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual. Following
ECM programming, the immobilizer system (if
equipped) must be linked to the ECM. Refer to section
11 “Immobilizer System-ECM replacement” for the
ECM/Immobilizer linking procedure.
- Verify repair -

6E-290 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No


Breaker box is not available:
1. Ignition "Off", engine "Off".
2. Disconnect the ECM connector.
3. Check the circuit for open circuit.
Was the problem found?
E-60(A)












E-61(B)







-

Repair faulty
harness and
verify repair

Go to Step 9
9
Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the "SPS (Service Programming System)".
Was the problem solved?
- Verify repair Go to Step 10
10
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual. Following
ECM programming, the immobilizer system (if
equipped) must be linked to the ECM. Refer to section
11 “Immobilizer System-ECM replacement” for the
ECM/Immobilizer linking procedure.
- Verify repair -

6E-292 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
7
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual. Following
ECM programming, the immobilizer system (if equipped)
must be linked to the ECM. Refer to section 11
“Immobilizer System-ECM replacement” for the
ECM/Immobilizer linking procedure.
- Verify repair -

6E-294 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
5
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual. Following
ECM programming, the immobilizer system (if
equipped) must be linked to the ECM. Refer to section
11 “Immobilizer System-ECM replacement” for the
ECM/Immobilizer linking procedure.
- Verify repair -