Isuzu 2008MY N Series Workshop Manual page 72

Step
Connect a DMM between the each position sensor
signal circuit (pins 2, 3 and 4 of E-2) and a known
good ground.
10
Is there circuit which did not voltage reading
within the specified value?
1. Test the position sensor signal circuits
between the VNT control module (pins 1, 2
and 3 of E-4) and the actuator & sensor (pins
2, 3 and 4 of E-2) for a short circuit each other.
11
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
Connect a DMM across the position sensor
reference voltage circuit and the low reference
circuit (pins 1 and 5 of E-2).
12
Is the DMM voltage more than the specified
value?
1. Test the position sensor reference voltage
circuit between the VNT control module (pin 8
of E-4) and the actuator & sensor (pin 1 of E-
2) for the following conditions:
• An open circuit
• A short to ground
13
• A short to the low reference circuit
• A short to battery or ignition voltage
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the position sensor signal circuits (which
ever voltage reading did not read within the
specified value at Step 10) between the VNT
control module (pins 1, 2 and 3 of E-4) and the
actuator & sensor (pins 2, 3 and 4 of E-2) for
the following conditions:
• An open circuit
• A short to ground
14
• A short to the low reference circuit
• A short to the reference voltage circuit
• A short to battery or ignition voltage
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the position sensor low reference circuit
between the VNT control module (pin 4 of E-4)
and the actuator & sensor (pin 5 of E-2) for an
open circuit or high resistance.
15
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
Action
Engine Control System (4HK1)
Value(s)
4.0 to 6.0
volts
Go to Step 14
—
Go to Step 20
8.0 to 10.0
volts
Go to Step 16
—
Go to Step 20
—
Go to Step 20
—
Go to Step 20
Yes No
Go to Step 11
Go to Step 12
Go to Step 15
Go to Step 17
Go to Step 17
Go to Step 17
1A-69