2004 ISUZU TF SERIES Workshop Manual

Page 2177 of 4264

ISUZU TF SERIES 2004  Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-181 
Step   Action  Value (s)  Yes  No 
6 
Check for the following conditions.  
  Objects blocking the throttle valve.  
  Vacuum leaking at throttle body.

Page 2178 of 4264

ISUZU TF SERIES 2004  Workshop Manual 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

Page 2179 of 4264

ISUZU TF SERIES 2004  Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-183 
DIAGNOSTIC TROUBLE CODE (DTC) P0122 (FLASH CODE 21) THROTTLE 
POSITION SENSOR CIRCUIT LOW INPUT 
  
 
 
RUW46EMF000101 
 
Condition For Setting The DTC a

Page 2180 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6E-184 3.5L ENGINE DRIVEABILITY AND EMISSIONS 
Diagnostic Trouble Code (DTC) P0122 (Flash Code 21) Throttle Position 
Sensor Circuit Low Input 
Step   Action  Value (s)  Yes  No 
1 
Was the "On-Board

Page 2181 of 4264

ISUZU TF SERIES 2004  Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-185 
Step   Action  Value (s)  Yes  No 
6 
Using the DVM and check the TPS. 
1.  Ignition "Off", engine "Off".  
2.  Disconnect TPS connector.  
3.  Measure t

Page 2182 of 4264

ISUZU TF SERIES 2004  Workshop Manual 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".

Page 2183 of 4264

ISUZU TF SERIES 2004  Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-187 
Step   Action  Value (s)  Yes  No 
13 
Replace the ECM. 
Is the action complete? 
IMPORTANT: The replacement ECM must be 
programmed. Refer to section of

Page 2184 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6E-188 3.5L ENGINE DRIVEABILITY AND EMISSIONS 
DIAGNOSTIC TROUBLE CODE (DTC) P0123 (FLASH CODE 21) THROTTLE 
POSITION SENSOR CIRCUIT HIGH INPUT 
  
 
 
RUW46EMF000101 
 
Condition For Setting The DTC