2004 ISUZU TF SERIES Workshop Manual

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Page 1577 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–205
Diagnostic Trouble Code (DTC) P0251 (Symptom Code B) (Flash Code 53)
Injection Pump Malfunction
Step Action Value(s) Yes No
1Was the “On-Board D

Page 1578 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–206 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0251 (Symptom Code D) (Flash Code 53)
Injection Pump Malfunction
Step Action Value(s) Yes No
1Was the “On-Board D

Page 1579 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–207
Diagnostic Trouble Code (DTC) P0251 (Symptom Code E) (Flash Code 53)
Injection Pump Malfunction
Step Action Value(s) Yes No
1Was the “On-Board D

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–207
Diagnostic Trouble Code (DTC) P0251 (Symptom Code E) (Flash Code 53)
Injection Pump Malfunction
Step Action Value(s) Yes No
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2Go 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 P0251 (Symptom Code E) stored as
“Present Failure”?—Go to Step 3Refer 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 P0251 (Symptom Code E) stored in this
ignition cycle?—Go to Step 4Refer to
Diagnostic Aids
4 Was the DTC P1650 (Symptom Code A) or P1651
(Symptom Code B) stored at the same time?
—Go to DTC
Chart P1650
(Symptom
Code A) Go to Step 5
5 Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?—Verify repair Go to Step 6
6 Substitute a known good ECM and recheck.
Was the problem solved?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure. —Go to Step 7Go to Step 8
7 Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.—Verify repair—
8 Replace the injection pump assembly.
Is the action complete?—Verify repair—

Page 1580 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–208 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P0335 (SYMPTOM CODE B)
(FLASH CODE 43)CRANKSHAFT POSITION SENSOR CIRCUIT MALFUNCTION
DIAGNOSTIC TROUBLE CODE (DTC) P

Page 1581 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–209
Condition for setting the DTC and action taken when the DTC sets
Circuit Description
The CKP sensor is located on top of the flywheel
housing of th

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–209
Condition for setting the DTC and action taken when the DTC sets
Circuit Description
The CKP sensor is located on top of the flywheel
housing of the flywheel and fix ed with a bolt. The CKP
sensor is of the magnet coil type. The inductive pickup
sensors four gaps in the flywheel ex citer ring and is
used to determine the engine speed and engine
cylinder top dead center.
If the CKP sensor harness or sensor malfunction is
detected during engine run, DTC P0335 (Symptom
Code B) is stored.
If the CKP sensor harness or sensor malfunction is
detected during engine cranking, DTC P0335
(Symptom Code D) is stored.
If the CKP sensor signal frequency is ex cessively high
or engine over-running, DTC P0335 (Symptom Code E)
is stored.
Diagnostic Aids
An intermittent may be caused by the following:
Poor connections.
Misrouted harness.
Rubbed through wire insulation.
Broken wire inside the insulation.
Check for the following conditions:
Poor connection at ECM-Inspect harness connectors
for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe
the “Engine Speed” display on the Tech2 while
moving connectors and wiring harness related to the
sensor.
Diagnostic Trouble Code (DTC) P0335 (Symptom Code B) (Flash Code 43)
Crankshaft Position Sensor Circuit Malfunction
Diagnostic Trouble Code (DTC) P0335 (Symptom Code D) (Flash Code 43)
Crankshaft Position Sensor Malfunction
Flash
CodeCode Symptom
CodeMIL DTC Name DTC Setting Condition Fail-Safe (Back Up)
43 P0335 B ON Crankshaft Position Sensor
Circuit Ma lfunction1. Engine speed is more than
665rpm.
2. CKP sensor pulse width
e rro r.When pump camshaft speed
senso r is OK:
ECM use s do uble d pump cam-
sha ft spe ed as substitute
engine speed.
When pump camshaft speed
senso r is not OK:
1. MAB (fuel cutoff solenoid
valve) is operated.
2. Desired injection quantity
becomes 0mg/strk.
D ON Crankshaft Position Sensor
Circuit Ma lfunction1. No pump camshaft speed
se nsor erro r.
2.“Cranksha ft Position Se n-
so r Circuit Ma lfunction
(Symptom Code B)” is not
stored.
3. Engine speed is 0rpm.
4. Do uble d pump camsha ft
speed is more than 50rpm.When pump camshaft speed
senso r is OK:
ECM use s do uble d pump cam-
sha ft spe ed as substitute
engine speed.
Other tha n pump camsha ft
speed sensor is OK:
Fuel inje ctio n qua ntity is
reduced.
E ON Engine Speed Input Circuit
Range/PerformanceEngine spe ed is more tha n
5700rpm.When intermittent malfunction:
1. MAB (fuel cutoff solenoid
valve) is operated.
2. Desired injection quantity
becomes 0mg/strk.
When preliminary malfunction:
ECM use s do uble d pump cam-
sha ft spe ed as substitute
engine speed.
Step Action Value(s) Yes No
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2Go to On Board
Diagnostic
(OBD) System
Check

Page 1582 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E –210 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
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: Dia

Page 1583 of 4264

ISUZU TF SERIES 2004 Workshop Manual 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –211
7 Using the DVM and check the CKP sensor circuit.
1. Ignition “Off ”, engine “Off ”.
2. Disconnect the CKP sensor connector.
3. C

Page 1584 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E –212 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
9 Using the DVM and check the CKP sensor circuit.
1. Ignition “On ”, engine “Off ”.
2. Disconnect the CKP sensor connector.
3. Che

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