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Page 2201 of 4264

ISUZU TF SERIES 2004  Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-205 
Step   Action  Value (s)  Yes  No 
7 
 Using the DVM and check the O2 sensor circuit for the 
affected bank. 
1.  Ignition "Off", engine "Off".  
2. Disc

Page 2202 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6E-206 3.5L ENGINE DRIVEABILITY AND EMISSIONS 
Step   Action  Value (s)  Yes  No 
11 
1.  Using the Tech 2, ignition "On" and engine "On".  
2. Select the "Miscellaneous Test" and perform the 
"IAC Co

Page 2204 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6E-208 3.5L ENGINE DRIVEABILITY AND EMISSIONS 
CIRCUIT DESCRIPTION 
 The Engine Control Module (ECM) supplies a bias
voltage of about 450 mV between the heated oxygen
sensor (HO2S) high and low circu

Page 2208 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6E-212 3.5L ENGINE DRIVEABILITY AND EMISSIONS 
Condition For Setting The DTC and Action Taken When The DTC Sets 
Flash 
Code Code  Type  DTC Name  DTC Setting Condition  Fail-Safe (Back Up) 
P0171  B

Page 2209 of 4264

ISUZU TF SERIES 2004  Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-213 
Diagnostic Trouble Code (DTC) P0171 (Flash Code 44) O2 Sensor System 
 Too Lean (Bank 1) 
Diagnostic Trouble Code (DTC) P0174 (Flash Code 44) O2 Sensor S

Page 2210 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6E-214 3.5L ENGINE DRIVEABILITY AND EMISSIONS 
Step   Action  Value (s)  Yes  No 
6 
1.  Using the Tech 2, ignition "On" and engine "Off".  
2.  Monitor the "Throttle Position" in the data display.

Page 2213 of 4264

ISUZU TF SERIES 2004  Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-217 
Condition For Setting The DTC and Action Taken When The DTC Sets 
Flash 
Code Code  Type  DTC Name  DTC Setting Condition  Fail-Safe (Back Up) 
P0172  B

Page 2214 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6E-218 3.5L ENGINE DRIVEABILITY AND EMISSIONS 
Diagnostic Trouble Code (DTC) P0172 (Flash Code 45) O2 Sensor System Too 
Rich (Bank 1) 
Diagnostic Trouble Code (DTC) P0175 (Flash Code 44) O2 Sensor Sy