OBD port ISUZU TF SERIES 2004 Repair Manual

TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-73

DTC P1791 (FLASHING CODE 62) Transmission Control Module RAM Error

Step Action Value(s) YES NO
1
Was the Powertrain On-Board Diagnostic (OBD)
System Check performed? — Go to Step 2 Go to OBD
System Check
2

1. Install the scan tool.

2. Key “OFF" and keep the position for more than 30
seconds.
3. Key “ON"

4. Check the DTC on the scan tool.
Does the scan tool indicate DTC P1791? — Go to Step 3 Refer to
Diagnostic Aids
3 Replace the TCM.
Important:
The replacement TCM must be
programmed (Refer to SPS for procedure).
Is the action complete? — Verify repair —

7A2-76 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)

DTC U2104 (FLASHING CODE 65) CAN BUSS OFF

Step Action Value(s) YES NO
1
Was the Powertrain On-Board Diagnostic (OBD)
System Check performed? — Go to Step 2 Go to OBD
System Check
2

1. Install the scan tool.

2. Key “ON".
3. Review and record scan tool data.

4. Operate the vehicle within scan tool data.
Does the scan tool indicate DTC U2104? — Go to Step 3 Refer to
Diagnostic Aids
3 Observe the valid data of the ECM on the scan tool.
Was the valid data of the ECM fixed or did not
synchronized? — Go to step 4 Refer to
Diagnostic Aids
4 Check the wire between the TCM connector and the
ECM connector by J39200 DMM.

1. Key “OFF".
2. Disconnect the TCM connector.

3. Measure the resistance between terminal C94-7
and terminal C94-17.
Is the resistance specified value? About 120
Go to Step 7 Go to Step 5
5 Check the resistance of the ECM..

1. Key "OFF".

2. Disconnect the ECM connector.
3. Measure the resistance between the ECM terminal
E60-70 and the ECM terminal E60-71.
Is the resistance specified value? About 120
Go to step 6 Go to step 8
6 Replace or Repair the wire between the TCM
connector C94-7,17 and the ECM connector E60-
70,71.
Is the action complete? — Verify repair —
7 Replace the TCM.
Important:
The replacement TCM must be
programmed (Refer to SPS for procedure).
Is the action complete? — Verify repair —
8 Replace the ECM.
Important:
The replacement ECM must be
programmed (Refer to SPS for procedure).
Is the action complete? — Verify repair —