Isuzu 4HL1 Workshop Manual page 120

1A-118 Engine Control System
Step
Check the VS sensor ground circuit for open
wiring.
1. Starter switch "OFF".
2. Measure the resistance between VS
7
sensor connector ground pin and ground
(e.g., frame or body)
Was the resistance within range?
Check the VS sensor signal circuit for open
wiring.
1. Starter switch "OFF".
2. Jumper the VS sensor connector and
8
measure the resistance at the VIM
connector.
Was the resistance within range?
Repair or replace the faulty harness.
9
Is the action complete?
Check the VS sensor.
1. Remove the VS sensor.
2. Connect the VS sensor connector.
3. Starter switch "ON".
10
4. While turning the VS sensor shaft slowly,
measure the voltage between connector
pins 2 and 3.
Did the voltage change within range?
Replace the VS sensor.
11
Is the action complete?
Review the DTC.
1. Using Tech 2, clear the DTC.
12
2. Perform test run and review the DTC.
Is DTC25 detected?
1. Replace the VIM.
IMPORTANT:
If necessary (for the vehicle equipped with
13
idle stop function), input the number of
startups to the replacing VIM.
Is the action complete?
Check DTC25 will not be set again.
1. Using Tech 2, clear the DTC.
14
2. Perform test run and review the DTC.
Is DTC25 detected?
Action Value(s)
Pins 2-
ground: 0 Ω
Go to Step 8
Pins 14-
ground
(jumpered:
pins 2-
ground): 0 Ω
Go to Step 10
Verify repair and
—
go to Step 14
1.0 ~ 3.0 V /
12.0 ~ 15.0 V
Go to Step 12
Verify repair and
—
go to Step 14
—
Go to Step 13
—
Verify repair and
go to Step 14
—
Refer to
Diagnostic Aids
and go to Step 2
Yes No
Go to Step 9
Go to Step 9
Go to Step 11
Refer to
Diagnostic Aids
Repair is
complete
—
—
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