2004 ISUZU TF SERIES Workshop Manual

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Page 1601 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –229
Diagnostic Trouble Code (DTC) P0400 (Symptom Code 3) (Flash Code 32)
Exhaust Gas Recirculation Flow Excessive Detected
Step Action Value(s) Yes

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –229
Diagnostic Trouble Code (DTC) P0400 (Symptom Code 3) (Flash Code 32)
Exhaust Gas Recirculation Flow Excessive Detected
Step Action Value(s) Yes No
1Was the “On-Board Diagnostic (OBD) System Check ”
performed?
— Go to Step 2 Go to
On Board
Diagnostic
(OBD) System Check
2 1. Connect the Tech 2. 2. Review and record the failure information.
3. Select “F0: Read DTC Infor As Stored By ECU ” in
“ F0: Diagnostic Trouble Codes ”.
Is the DTC P0400 (Symptom Code 3) stored as
“ Present Failure ”? —Go to Step 3 Refer to
Diagnostic Aids and Go to Step
3
3 1. Using the Tech 2, ignition “On ” and engine “Off ”.
2. Select “F1: Clear DTC Information ” in “F0:
Diagnostic Trouble Codes ” with the Tech 2 and
clear the DTC information.
3. Operate the vehicle and monitor the “F0: Read
DTC Infor As Stored By ECU ” in the “F0:
Diagnostic Trouble Codes ”.
Was the DTC P0400 (Symptom Code 3) stored in this
ignition cycle? —Go to Step 4 Refer to
Diagnostic Aids and Go to Step
4
4 Remove the MAF & IAT sensor assembly and check for the following conditions.
Objects blocking the air cleaner.
Objects blocking the MAF sensor.
Vacuum leaking at intake duct.
Objects blocking the turbocharger.
If a problem is found, repair as necessary.
Was the problem found? —Verify repair Go to Step 5
5 Remove the MAF & IAT sensor assembly and visually check.
Was the problem found? —Go to Step 6 Go to Step 8
6 Substitute a known good MAF & IAT sensor assembly and recheck.
Was the problem solved? —Go to Step 7 Go to Step 8
7 Replace the MAF & IAT sensor assembly. Is the action complete? —Verify repair —
8 Using the DVM and check the EGR EVRV. 1. Ignition “Off ”, engine “Off ”.
2. Disconnect the EGR EVRV connector.
3. Measure the resistance of EGR EVRV solenoid coil.
Does the tester indicate standard resistance?
Approx imately 14 at 20 °CGo to Step 11 Go to Step 9
1
2
EGR EVRV
1
2

Page 1602 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–230 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
9 Substitute a known good EGR EVRV and recheck.
Was the problem solved?—Go to Step 10Go to Step 11
10 Replace the EGR EVRV.
Is the action compl

Page 1603 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–231
14 Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming S

Page 1604 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E –232 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0400 (Symptom Code 4) (Flash Code 32)
Exhaust Gas Recirculation Circuit Short to Ground or Open Circuit
Step Acti

Page 1605 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –233
6 Using the DVM and check the EGR EVRV power
supply circuit.
1. Ignition “On ”, engine “Off ”.
2. Remove the EGR EVRV connector.

Page 1606 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–234 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
10 Replace the EGR EVRV.
Is the action complete?—Verify repair—
11 Is the ECM programmed with the latest software
release?
If not, download t

Page 1607 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –235
Diagnostic Trouble Code (DTC) P0400 (Symptom Code 5) (Flash Code 32)
Exhaust Gas Recirculation Flow Insufficient Detected
Step Action Value(s) Y

Page 1608 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–236 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
8 Using the Tech 2 or the vacuum pump and check the
EGR valve operation for the following condition
through the small window.
ÅERestrict shaft mov

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