Dtc P0201, P0202, P0203 Or P0204 - Isuzu 2008MY N Series Workshop Manual

1A-132 Engine Control System (4HK1)
DTC P0201, P0202, P0203 or P0204 (Flash Code 271, 272, 273 or 274)
Circuit Description
The ECM calculates the optimum fuel injection ON time
using data sent from various engine sensors. The
common 1 and 2 fuel injector charge voltage circuits
are high-voltage supply, which drives fuel injectors for
each cylinder in conjunction with the ECM grounding
the fuel injector solenoid control circuit. 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 fuel injector charge voltage circuit or solenoid
control circuit is open circuit, DTC P0201 - P0204 will
set depending upon which cylinder injector circuit
failed. If the fuel injector solenoid control circuit is
shorted to voltage circuit or common charge voltage
circuit, this DTC will also set.
Condition for Running the DTC
• DTCs P1261 and P2146 are not set. (DTC P0201
or P0204)
• DTCs P1262 and P2149 are not set. (DTC P0202
or P0203)
• The battery voltage is between 18 to 32 volts.
• The ignition switch is ON.
• The engine is running.
Condition for Setting the DTC
Either of following condition is met:
• The ECM detects an open circuit on the fuel
injector solenoid circuits.
Circuit/ System Testing DTC P0201
Step
Did you perform the Diagnostic System Check
1
- Engine Controls?
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
2
4. Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition?
1. Turn OFF the ignition.
2. Disconnect the in-line harness connector from
the cylinder head cover case.
3. Measure the resistance of the charge voltage
circuit across the female side connector.
3
4. Measure the resistance of the charge voltage
circuit across the male side connector.
Are both resistance readings less than the
specified value (either of reading is out of
specified value will not set this DTC)?
Action
• The ECM detects that the fuel injector solenoid
control circuit is shorted to voltage circuit or charge
voltage circuit.
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.
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.
Notice: Each DTC agrees with engine cylinder order.
• P0201: Cylinder #1
• P0202: Cylinder #2
• P0203: Cylinder #3
• P0204: Cylinder #4
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Value(s) Yes
—
Go to Step 2
—
Go to Step 3
1.0Ω
Go to Step 4
No
Go to Diagnostic
System Check -
Engine Controls
Go to Diagnostic
Aids
Go to Step 9