2004 ISUZU TF SERIES Workshop Manual

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ISUZU TF SERIES 2004  Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–101
5. After choosing the data, click the “Nex t” button.
6. When all the necessary information is entered, the
“details” of software within th

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ISUZU TF SERIES 2004  Workshop Manual 6E–102 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
HOW TO USE BREAKER BOX
The engine control module (ECM) and other connectors
have water proof connector and special terminal. Water
proof terminal d

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ISUZU TF SERIES 2004  Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–103
Breaker Box Connection Type A 
Breaker box  connection type A, check for “open circuit”
and “short to ground circuit”.
342
51
(1) Engine Co

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ISUZU TF SERIES 2004  Workshop Manual 6E–104 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
Breaker Box Connection Type B
Breaker box  connection type B, check for “short to
power supply circuit” and “power, signal voltage check”
b

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ISUZU TF SERIES 2004  Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–105
ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK
Circuit Description
The on-board diagnostic system check is the starting
point for any driveability complain

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ISUZU TF SERIES 2004  Workshop Manual 6E–106 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6. The Tech2 parameters which is not within the typical
range may help to isolate the area which is causing the
problem.12. This vehicle is equippe

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ISUZU TF SERIES 2004  Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–107
8Using the DVM and check the data link connector
ground circuit.
1. Ignition “Off”, engine “Off”. 
2. Check the circuit for open circuit.

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ISUZU TF SERIES 2004  Workshop Manual 6E–108 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
11Using the DVM and check the data link connector
communication circuit.
1. Ignition “Off”, engine “Off”. 
2. Disconnect the ECM connector.