power ISUZU TF SERIES 2004 Workshop Manual

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-283
Step Action Value (s) Yes No
12
Repair the open circuit between the VSS and meter
fuse.
Is the action complete?
- Verify repair -
13
Using the DVM and check the VSS ground circuit.
1. Ignition "On", engine "Off".
2. Disconnect the VSS connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
E-44
V


Less than 1VGo to Step 14 Repair faulty
harness and
verify repair
14
Using the DVM and check the VSS ground circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the VSS connector.
3. Check the circuit for open circuit.
Was the problem found?
E-44




- Repair faulty
harness and
verify repair Go to Step 23
15
Using the DVM and check the VSS signal circuit.
1. Ignition "On", engine "Off".
2. Disconnect the VSS connector and meter
connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
E-44


B-24
V

V


Less than 1V
Go to Step 16
Repair faulty
harness and
verify repair

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

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-299
Step Action Value (s) Yes No
6
Remove the IAC Valve and visually check.
Was the problem found?
- Go to Step 12 Go to Step 7
7
Using the DVM and check the IAC Valve coil at IAC
Valve.
1. Ignition "Off", engine "Off".
2. Disconnect the IAC Valve connector.
3. Check the coil resistance.
Does the tester indicate standard resistance as shown
in the following table?
IAC Valve














Measurement Terminal Resistance ()
1 - 2 Approximately 50
2 - 3 Approximately 50
1 – 3 Approximately 100
4 - 5 Approximately 50
5 - 6 Approximately 50
4 - 6 Approximately 100
-
Go to Step 8
Go to Step 12
8
Using the DVM and check the IAC Valve power supply
circuit.
1. Ignition "Off", engine "Off".

2. Disconnect the IAC Valve connector and ECM
main relay
3. Check the circuit for open circuit.
Was the problem found?
X-13E-70











-
Repair faulty
harness and
verify repair
Go to Step 9

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-303
Step Action Value (s) Yes No
11
Using the DVM and check the IAC Valve circuit.
1. Ignition "On", engine "Off".
2. Disconnect the IAC Valve connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicate voltage?
E-70
VVVV






-
Repair faulty
harness and
verify repair
Go to Step 14
12
Substitute a known good IAC Valve and recheck.
Was the problem solved?
- Go to Step 13 Go to Step 14
13
Replace the IAC Valve.
Was the problem solved?
- Verify repair Go to Step 14
14
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 15
15
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 -

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-305
Diagnostic Trouble Code (DTC) P1601 (Flash Code 65) CAN Bus Off

Step Action Value (s) Yes No
1
Was the "On-Board Diagnostic (OBD) System Check"
performed?
- Go to Step 2 Go to On Board
Diagnostic (OBD)
System Check
2
1. Connect the Tech 2.
2. Review and record the failure information.
3. Select "F0: Read DTC Infor By Priority" in "F0:
Diagnostic Trouble Code".
Is the DTC P1601 stored as "Present Failure"?
- Go to Step 3 Refer to
Diagnostic Aids
and Go to Step 3
3
1. Using the Tech2, ignition "On" and engine "Off".
2. Select "Clear DTC Information" with the Tech2 and
clear the DTC information.
3. Operate the vehicle and monitor the "F5: Failed
This Ignition" in "F2: DTC Information"
Was the DTC P1601 stored in this ignition cycle?
- Go to Step 4 Refer to
Diagnostic Aids
and Go to Step 4
4
Check any accessory parts which may cause electric
interference.
Was the problem found?
- Remove the
accessory parts
and verify repair Go to Step 5
5
1. Using the Tech 2, ignition "On" and engine "Off".
2. Select "AW30-40LE" in the system selection menu
"Powertrain".
3. Select "Read DTC Info Ordered By Priority" in the
"Diagnositic Trouble Code".
Was the any DTC's P1767 or U2104 stored in this
ignition cycle?
- Refer to
"Automatic
Transmission
Workshop
Manual" & Go to
DTC Chart
P1767 or U2104 Go to Step 6
6
Check for poor/faulty connection at the TCM or ECM
connector. If a poor/faulty connection is found, repair
as necessary.
Was the problem found?
E-60(A)








- Verify repair Go to Step 7

6E-306 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
7
Using the DVM and check the CAN BUS high circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the TCM connector.
3. Ignition "On".
4. Check the circuit for short to power supply circuit.
Was the problem found?


V



-
Repair faulty
harness and
verify repair
Go to Step 8
8
Using the DVM and check the CAN BUS low circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the TCM connector.
3. Ignition "On".
4. Check the circuit for short to power supply circuit.
Was the problem found?


V



-
Repair faulty
harness and
verify repair
Go to Step 9
9
Using the DVM and check the ECM CAN BUS circuit.
1. Ignition "Off", engine "Off".
2. Disconnect TCM connector.
3. Measure the resistance of ECM CAN BUS circuit.
Does the tester indicate standard resistance?






Approximately
120
Go to Step 14
Close to 0:
Go to Step 10
No resistance:
Go to Step 11

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-311
Diagnostic Trouble Code (DTC) U2104 (Flash Code 67) CAN Bus Reset
Counter Over-Run

Step Action Value (s) Yes No
1
Was the "On-Board Diagnostic (OBD) System Check"
performed?
- Go to Step 2 Go to On Board
Diagnostic (OBD)
System Check
2
1. Connect the Tech 2.
2. Review and record the failure information.
3. Select "F0: Read DTC Infor By Priority" in "F0:
Diagnostic Trouble Code".
Is the DTC U2104 stored as "Present Failure"?
- Go to Step 3 Refer to
Diagnostic Aids
and Go to Step 3
3
1. Using the Tech2, ignition "On" and engine "Off".
2. Select "Clear DTC Information" with the Tech2 and
clear the DTC information.
3. Operate the vehicle and monitor the "F5: Failed
This Ignition" in "F2: DTC Information"
Was the DTC U2104 stored in this ignition cycle?
- Go to Step 4 Refer to
Diagnostic Aids
and Go to Step 4
4
1. Using the Tech 2, ignition "On" and engine "Off".
2. Select "AW30-40LE" in the system selection menu
"Powertrain".
3. Select "Read DTC Info Ordered By Priority" in the
"Diagnositic Trouble Code".
Was the any DTC's P1767 or U2104 stored in this
ignition cycle?
- Refer to
"Automatic
Transmission
Workshop
Manual" & Go to
DTC Chart
P1767 or U2104 Go to Step 5
5
Check any accessory parts which may cause electric
interference.
Was the problem found?
- Remove the
accessory parts
and verify repair Go to Step 6
6
Check for poor/faulty connection at the TCM or ECM
connector. If a poor/faulty connection is found, repair
as necessary.
Was the problem found?
E-60(A)








- Verify repair Go to Step 7

6E-312 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
7
Using the DVM and check the CAN BUS high circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the TCM connector.
3. Ignition "On".
4. Check the circuit for short to power supply circuit.
Was the problem found?


V



-
Repair faulty
harness and
verify repair
Go to Step 8
8
Using the DVM and check the CAN BUS low circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the TCM connector.
3. Ignition "On".
4. Check the circuit for short to power supply circuit.
Was the problem found?


V



-
Repair faulty
harness and
verify repair
Go to Step 9
9
Using the DVM and check the ECM CAN BUS circuit.
1. Ignition "Off", engine "Off".
2. Disconnect TCM connector.
3. Measure the resistance of ECM CAN BUS circuit.
Does the tester indicate standard resistance?






Approximately
120
Go to Step 14
Close to 0: Go
to Step 10
No resistance:
Go to Step 11

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-319
Step Action Value (s) Yes No
7
Using the DVM and check the "CHECK ENGINE"
lamp circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the meter connector and immobilizer
control unit connector.
3. Ignition "On".
4. Check the circuit for short to power supply circuit.
Was the problem found?
B-68

V

-
Repair faulty
harness and
verify repair
Go to Step 8