Isuzu 2008MY N Series User Manual

Engine Control System (4HK1) 1A-221
5
1. Leave the DMM connected to the idle up
sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the accelerator pedal position
(APP) 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 10 Go to Step 6
6
Notice: If no PTO throttle sensor is installed, skip
to Step 7.
1. Leave the DMM connected to the idle up
sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the PTO throttle sensor 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 7
7
1. Test the 5 volts reference circuit between the
ECM (pin 42 of J-14) and the following
components for a short to ground or short to
the low reference circuit:
• APP sensor 1 (pin 4 of B-5)
• PTO throttle sensor (pin 1 of J-39)
• Idle up sensor (pin 3 of B-87)
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 13 Go to Step 12
8
1. Test the 5 volts reference circuit between the
ECM (pin 42 of J-14) and the following
components for a short to battery or ignition
voltage.
• APP sensor 1 (pin 4 of B-5)
• PTO throttle sensor (pin 1 of J-39)
• Idle up sensor (pin 3 of B-87)
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 13 Go to Step 12
9
Replace the idle up sensor. Refer to Idle Up Sensor
in Section 1I Engine Speed Control System.
Did you complete the replacement?
—
Go to Step 13
—
10
Replace the APP sensor. Refer to Accelerator
Pedal Sensor in Section 1I Engine Speed Control
System.
Did you complete the replacement?
—
Go to Step 13
—
11
Replace the PTO throttle sensor.
Did you complete the replacement?
—
Go to Step 13
—
12
Important: Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
—
Go to Step 13
—
Step Action Value(s) Yes No
LG4HKED-WE-0871.book 221 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