Isuzu 2008MY N Series User Manual

Engine Control System (4HK1) 1A-233
5
1. Leave the DMM connected to the boost
pressure sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the intake throttle valve harness
connector.
4. Turn ON the ignition, with the engine OFF.
Does the DMM voltage change to more than
the specified value?
4.5 volts
Go to Step 11 Go to Step 6
6
1. Leave the DMM connected to the boost
pressure sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the crankshaft position (CKP)
sensor harness connector.
4. Turn ON the ignition, with the engine OFF.
Does the DMM voltage change to more than
the specified value?
4.5volts
Go to Step 12 Go to Step 7
7
1. Leave the DMM connected to the boost
pressure sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the exhaust differential pressure
sensor harness connector.
4. Turn ON the ignition, with the engine OFF.
Does the DMM voltage change to more than
the specified value?
4.5volts
Go to Step 13 Go to Step 8
8
1. Test the 5 volts reference circuit 3 between the
ECM (pin 80 of J-14) and the exhaust
differential pressure sensor (pin 3 of J-33) for
a short to ground or short to the low reference
circuit.
2. Test the 5 volts reference circuit 4 between the
ECM (pin 95 of E-12) and the following
components for a short to ground or short to
the low reference circuit:
• CKP sensor (pin 3 of E-20)
• Boost pressure sensor (pin 3 of E-24)
• Intake throttle position sensor (pin 5 of E-
16)
3. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 15 Go to Step 14
9
1. Test the 5 volts reference circuit 3 between the
ECM (pin 80 of J-14) and the exhaust
differential pressure sensor (pin 3 of J-33) for
a short to battery or ignition voltage.
2. Test the 5 volts reference circuit 4 between the
ECM (pin 95 of E-12) and the following
components for a short to battery or ignition
voltage.
• CKP sensor (pin 3 of E-20)
• Boost pressure sensor (pin 3 of E-24)
• Intake throttle position sensor (pin 5 of E-
16)
3. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 15 Go to Step 14
Step Action Value(s) Yes No
LG4HKED-WE-0871.book 233 ページ ２００７年１１月２９日 木曜日 午後６時２９分

Isuzu 2008MY N Series Specifications

General

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