1998 ISUZU TROOPER Service Repair Manual

Page 2025 of 3573

ISUZU TROOPER 1998  Service Repair Manual 6E±132
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1404 (Flash DTC 31) 
EGR VSV Circuit
060RW135
Circuit Description
The Engine control module (ECM) monitors the EGR
val

Page 2026 of 3573

ISUZU TROOPER 1998  Service Repair Manual 6E±133 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1404 ± EGR VSV Circuit	
StepNo Ye s Value(s) Action
3Check the VSV circuit.
Was the VSV circuit open or darmage?
ÐGo to Step 4Go to S

Page 2027 of 3573

ISUZU TROOPER 1998  Service Repair Manual 6E±134
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0405 (Flash DTC 26) 
EGR Pressure Sensor Low Voltage
060RW134
Action Taken When the DTC Sets
The ECM will illuminate

Page 2028 of 3573

ISUZU TROOPER 1998  Service Repair Manual 6E±135 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0405 ± EGR Pressure Sensor Low Voltage	
StepNo Ye s Value(s) Action
31. Turn off the ignition switch.
2. Remove the sensor connector c

Page 2029 of 3573

ISUZU TROOPER 1998  Service Repair Manual 6E±136
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1405 (Flash DTC 37) 
EGR EVRV Circuit Open/Short
060RW135
Circuit Description
EGR EVRV Circuit has a common power sour

Page 2030 of 3573

ISUZU TROOPER 1998  Service Repair Manual 6E±137 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1405 ± EGR EVRV Circuit Open/Short
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go t

Page 2031 of 3573

ISUZU TROOPER 1998  Service Repair Manual 6E±138
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0406 (Flash DTC 26) 
 EGR Pressure Sensor High Voltage
 060RW134
Action Taken When the DTC Sets
The ECM will illumina

Page 2032 of 3573

ISUZU TROOPER 1998  Service Repair Manual 6E±139 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0406 ± EGR Pressure Sensor High Voltage	
StepNo Ye s Value(s) Action
4Is the EGR pressure sensor voltage value displayed on
the Tech 2