service ISUZU TF SERIES 2004 Workshop Manual

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-153
Step Action Value (s) Yes No
11
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-157
Step Action Value (s) Yes No
7
Using the DVM and check the MAF sensor ground
circuit.
1. Ignition "On", engine "Off".
2. Disconnect the MAF sensor connector .
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
E-63
V




Less than 1V
Go to Step 8
Repair faulty
harness and
verify repair
8
Using the DVM and check the MAF sensor signal
circuit.
1. Ignition "On", engine "Off".
2. Disconnect the MAF sensor connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
E-63
V




Less than 1V
Go to Step 11
Repair faulty
harness and
verify repair
9
Substitute a known good MAF & IAT sensor assembly
and recheck.
Was the problem solved?
- Go to Step 10 Go to Step 11
10
Replace the MAF & IAT sensor assembly.
Is the action complete?
- Verify repair -
11
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 12
12
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-162 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
10
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 11
11
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-167
Step Action Value (s) Yes No

Breaker box is not available:
1. Ignition "Off", engine "Off".
2. Disconnect the IAT sensor connector.
3. Check the circuit for open circuit.
Was the problem found?
E-61(B)
E-63






- Repair faulty
harness and
verify repair Go to Step 14
12
Substitute a known good MAF & IAT sensor assembly
and recheck.
Was the problem solved?
- Go to Step 13 Go to Step 14
13
Replace the MAF & IAT sensor assembly.
Is the action complete?
- Verify repair -
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-171
Step Action Value (s) Yes No
7

Using the DVM and check the ECT sensor 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 ECT sensor connector.
4. Check the circuit for short to sensor ground or
ground circuit.
Was the problem found?
A21A22


Breaker Box




Breaker box is not available:
1. Ignition "Off", engine "Off".
2. Disconnect the ECT sensor connector.
3. Check the circuit for short to sensor ground or
ground circuit.
Was the problem found?
E-60(A)










-

Repair faulty
harness and
verify repair

Go to Step 10
8
Substitute a known good ECT sensor assembly and
recheck.
Was the problem solved?
- Go to Step 9 Go to Step 10
9
Replace the ECT sensor.
Is the action complete?
- Verify repair -
10
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 11

6E-172 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
11
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-177
Step Action Value (s) Yes No
11

Using the DVM and check the ECT sensor ground
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 ECT sensor connector.
4. Check the circuit for open circuit.
Was the problem found?
A22
Breaker Box
E-69






Breaker box is not available:
1. Ignition "Off", engine "Off".
2. Disconnect the ECT sensor connector.
3. Check the circuit for open circuit.
Was the problem found?
E-60(A)
E-69










-

Repair faulty
harness and
verify repair

Go to Step 14
12
Substitute a known good ECT sensor assembly and
recheck.
Was the problem solved?
- Go to Step 13 Go to Step 14
13
Replace the ECT sensor.
Is the action complete?
- Verify repair -
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

6E-178 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
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 -

6E-182 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
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 -

6E-186 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
9

Using the DVM and check the TPS 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 TPS connector.
4. Check the circuit for open, short to sensor ground
or short to ground circuit.
Was the problem found?
B26B39


Breaker BoxE-68







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












-

Repair faulty
harness and
verify repair

Go to Step 12
10
Substitute a known good TPS and recheck.
Was the problem solved?
- Go to Step 11 Go to Step 12
11
Replace the TPS.
Is the action complete?
- Verify repair -
12
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 13