Isuzu 2008MY N Series User Manual

1A-240 Engine Control System (4HK1)
DTC P1261 or P1262 (Flash Code 34)
Circuit Description
The charge up circuit in the ECM steps up the voltage
for fuel injectors and is divided into two banks, common
1 and 2. The common 1 covers fuel injectors in
cylinders #1 and #4, and the common 2 covers fuel
injectors in cylinders #2 and #3. If the common 1 or
common 2 fuel injector charge up circuit in the ECM is
an open circuit, DTC P1261 or P1262 will set.
Condition for Running the DTC
• The battery voltage is between 16 to 32 volts.
• The ignition switch is ON.
Condition for Setting the DTC
• The ECM detects its internal common 1 fuel
injector charge up circuit is open circuit. (DTC
P1261)
• The ECM detects its internal common 2 fuel
injector charge up circuit is open circuit. (DTC
P1262)
Action Taken When the DTC Sets
• The ECM illuminates the MIL when the diagnostic
runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
• The ECM limits fuel injection quantity.
• The ECM inhibits pilot injection.
• The ECM inhibits EGR control.
Condition for Clearing the DTC
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type A.
Diagnostic Aids
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.
Circuit/ System Testing DTC P1261 or P1262
Step Action Value(s) Yes No
1
Did you perform the Diagnostic System Check
- Engine Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Engine Controls
2
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition?
—
Go to Step 3 Go to Step 4
3
Important: Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
—
Go to Step 4
—
4
1. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition?
—
Go to Step 3 Go to Step 5
5
Observe the DTC Information with a scan tool.
Are there any DTCs that you have not
diagnosed?
—
Go to DTC List System OK
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Isuzu 2008MY N Series Specifications

General

Brand	Isuzu
Model	2008MY N Series
Category	Control Systems
Language	English