Isuzu 2008MY N Series Workshop Manual page 231

1A-228 Engine Control System (4HK1)
Step
1. Test the 5 volts reference circuit 2 between the
ECM (pin 61 of J-14) and the following
components for a short to battery or ignition
voltage.
• APP sensor 2 (pin 1 of B-5)
• BARO sensor (pin 3 of B-121)
2. Test the 5 volts reference circuit 5 between the
ECM (pin 87 of E-12) and the following
10
components for a short to battery or ignition
voltage.
• FRP sensor (pin 3 of E-19)
• CMP sensor (pin 3 of E-18)
• EGR valve position sensor (pin 1 of E-15)
3. Repair the circuit(s) as necessary.
Did you find and correct the condition?
Replace the EGR valve. Refer to EGR Valve and
EGR Cooler in Section 1F Emission Control.
11
Did you complete the replacement?
Replace the FRP sensor. Refer to Fuel Pressure
Sensor in Section 1D Engine Fuel.
12
Did you complete the replacement?
Replace the CMP sensor. Refer to CMP Sensor in
Section 1B Engine Mechanical.
13
Did you complete the replacement?
Replace the BARO sensor. Refer to BARO Sensor
Replacement.
14
Did you complete the replacement?
Replace the APP sensor. Refer to Accelerator
Pedal Sensor in Section 1I Engine Speed Control
15
System.
Did you complete the replacement?
Important:
programmed and learned.
16
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
1. Reconnect
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
17
5. Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition?
Observe the DTC Information with a scan tool.
18
Are there any DTCs that you have not
diagnosed?
Action
Replacement ECM
all previously disconnected
within the conditions
Value(s)
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must be
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that you
—
Yes
Go to Step 17 Go to Step 16
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 3 Go to Step 18
Go to DTC List
No
—
—
—
—
—
—
System OK