2004 ISUZU TF SERIES ignition

6E-230 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
7
Using the DVM and check the injector power supply
circuit.
1. Ignition "On", engine "Off".
2. Disconnect the injector connector for the affected
cylinder.
3. Check the circuit for open circuit.
Was the DVM indicated specified value?
E-6/E-7/E-8/E-9/
E-51/E-52
V



Battery voltage
Go to Step 9
Go to Step 8
8
Repair the open or short to ground circuit between the
ECM main relay and injector for the affected cylinder.
Is the action complete?
- Verify repair -
9
Using the DVM and check the injector signal circuit.
Breaker box is available:
1. Ignition "Off", engine "Off".
2. Install the breaker box as type A (ECM
disconnected).
Refer to 6E-95 page.
3. Disconnect the injector connector for the affected
cylinder.
4. Check the circuit for open or short to ground circuit.
Was the problem found?
A36
Breaker Box


E-6


No.1 Cylinder

B3
Breaker Box


E-7


No.2 Cylinder

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-231
Step Action Value (s) Yes No

A35
Breaker Box


E-8


No.3 Cylinder

B4
Breaker Box


E-9


No.4 Cylinder

A34
Breaker Box


E-51


No.5 Cylinder

B5
Breaker Box


E-52


No.6 Cylinder


Breaker box is not available:
1. Ignition "Off", engine "Off".
2. Disconnect the injector connector for the affected
cylinder and ECM connector.
3. Check the circuit for open or short to ground circuit.
Was the problem found?
E-60(A)
E-6






 No.1 Cylinder

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-233
Step Action Value (s) Yes No
10 Using the DVM and check the injector signal circuit.
1. Ignition "On", engine "Off".
2. Disconnect the injector connector for the affected
cylinder.
3. Check the circuit for short to battery voltage circuit.
Was the DVM indicated battery voltage?
E-6/E-7/E-8/E-9/
E-51/E-52
V



- Repair faulty
harness and
verify repair Go to Step 12
11
Replace the injector for the affected cylinder.
Was the problem solved?
- Verify repair Go to Step 12
12
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 13
13
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 -

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-235
CIRCUIT DESCRIPTION
The CKP reference signal is produced by the crankshaft
position (CKP) sensor. During one crankshaft
revolution, crankshaft pulses will be produced. The
Engine Control Module (ECM) uses the CKP reference
signal to calculate engine RPM and crankshaft position.
The ECM constantly monitors the number of pulses on
the CKP reference circuit and compares them to the
number of camshaft position (CMP) signal pulses being
received. If the ECM receives an incorrect number o
f
pulses on the CKP reference circuit, DTC P0336 will
set.

DIAGNOSTIC AIDS
An intermittent may be caused by a poor connection,
rubbed–through wire insulation or a wire broken inside
the insulation. Check for:
 Poor connection –Inspect the ECM harness and
connectors for improper mating, broken locks,
improperly formed or damaged terminals, and poo
r
terminal-to-wire connection.
 Damaged harness – Inspect the wiring harness fo
r
damage.
Reviewing the Failure Records vehicle mileage since
the diagnostic test last failed may help determine ho
w
often the condition that caused the DTC to be set
occurs. This may assist in diagnosing the condition.

Diagnostic Trouble Code (DTC) P0336 (Flash Code 29) Crankshaft Position
Sensor Circuit Range/Performance (58X)
Diagnostic Trouble Code (DTC) P0337 (Flash Code 29) Crankshaft Position
Sensor Circuit No Signal (58X)

Step Action Value (s) Yes No
1
Was 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 By Priority" in "F0:
Diagnostic Trouble Code".
Is the DTC P0336 or P0337 stored as "Present
Failure"?
- Go to Step 3 Refer to
Diagnostic Aids
and Go to Step 3
3
1. Using the Tech2, ignition "On" and engine "Off".
2. Select "Clear DTC Information" with the Tech2 and
clear the DTC information.
3. Operate the vehicle and monitor the "F5: Failed
This Ignition" in "F2: DTC Information"
Was the DTC P0336 or P0337 stored in this ignition
cycle?
- Go to Step 4 Refer to
Diagnostic Aids
and Go to Step 4
4
Check any accessory parts which may cause electric
interference or magnetic interference.
Was the problem found?
- Remove the
accessory parts
and verify repair Go to Step 5
5
Attempt to start the engine.
Does the engine start and continue to "Run"?
- Go to Step 6 Go to Step 7

6E-236 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
6

Using the DVM and check the CKP sensor signal.
1. Ignition "On", engine "On".
2. Measure the CKP output voltage at the sensor and
ECM.
Does the tester indicate standard voltage?

Measurement Point Voltage (V) (AC Range)
At CKP sensor terminal 3 & GND
At ECM E60 connector A23 & GND
Approximately 1.9 V at 2000rpm

If a oscilloscope is available, monitor the CKP sensor
signal.
Does the oscilloscope indicate correct wave form?
Crankshaft Position (CKP) Sensor Reference Wave Form
0V


Measurement Terminal: A23(+) A25(-)
Measurement Scale: 2.0V/div 5ms/div
Measurement Condition: Approximately 2000rpm

Go to Step 17 Go to Step 7
7
Check for poor/faulty connection at the CKP sensor or
ECM connector. If a poor/faulty connection is found,
repair the faulty terminal.
Was the problem found?
E-60(A)





E-59





- Verify repair Go to Step 8

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-237
Step Action Value (s) Yes No
8
Remove the CKP sensor from the cylinder block and
visually check.
Check for the following conditions.

Objects sticking the CKP sensor.

Objects sticking the CKP sensor pluser.

Gear missing the CKP sensor pluser.
Was the problem found?
- Verify repair Go to Step 9
9
Using the DVM and check the CKP sensor power
supply circuit.
1. Ignition "On", engine "Off".
2. Disconnect the CKP sensor connector.
3. Check the circuit for open, short to ground or short
to battery voltage circuit.
Was the DVM indicated specified value?
E-59
V



Approximately
5.0V
Go to Step 12
Less than 1V:
Go to Step 10
More than
specified value:
Go to Step 11
10
Repair the open or short to ground circuit between the
ECM and CKP sensor.
Was the problem solved?
E-60(A)
E-59


- Verify repair Go to Step 21

6E-238 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
11
Repair the short to battery voltage circuit between the
ECM and CKP sensor.
Was the problem solved?
E-60(A)
E-59


- Verify repair Go to Step 21
12
Using the DVM and check the CKP sensor signal
circuit.
Breaker box is available:
1. Ignition "Off", engine "Off".
2. Install the breaker box as type A (ECM
disconnected).
Refer to 6E-95 page.
3. Disconnect the CKP sensor connector.
4. Check the circuit for open, short to sensor ground
or short to ground circuit.
Was the problem found?
E-59



A23A25


Breaker Box

3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-239
Step Action Value (s) Yes No

Breaker box is not available:
1. Ignition "Off", engine "Off".
2. Disconnect the CKP sensor connector and ECM
connector.
3. Check the circuit for open, short to sensor ground
or short to ground circuit.
Was the problem found?
E-60(A)
E-59







- Repair faulty
harness and
verify repair Go to Step 13
13
Using the DVM and check the CKP sensor signal
circuit.
1. Ignition "On", engine "Off".
2. Disconnect the CKP sensor connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
E-59
V




Less than 1V
Go to Step 14
Repair faulty
harness and
verify repair