Isuzu 4HL1 Workshop Manual page 124

1A-122 Engine Control System
Step
Check the PTO accelerator sensor circuit for
short.
1. Disconnect the VIM.
2. Disconnect the PTO accelerator sensor
7
connector.
3. At the VIM connector pins, measure the
resistance.
Was the resistance within range?
Repair or replace the faulty harness.
8
Is the action complete?
Check the PTO accelerator sensor.
1. Measure the resistance between each
sensor connector pin and ground (e.g.,
9
frame or body)
Was the resistance within range?
Replace the
accelerator sensor).
10
Is the action complete?
Review the DTC.
1. Certainly connect the PTO accelerator
sensor and VIM connectors.
11
2. Using Tech 2, clear the DTC.
3. Perform test run and review the DTC.
Is DTC28 detected?
1. Replace the VIM.
IMPORTANT:
If necessary (for the vehicle equipped with
12
idle stop function), input the number of
startups to the replacing VIM.
Is the action complete?
Check DTC28 will not be set again.
1. Using Tech 2, clear the DTC.
13
2. Perform test run and review the DTC.
Is DTC28 detected?
Action
PTO control lever
Value(s)
Pins 71-31:
∞ Ω
Pins 31-34:
∞ Ω
Pins 71-34:
∞ Ω
—
∞ Ω
(PTO
—
—
—
—
Yes
Go to Step 9
Verify repair and
go to Step 13
Go to Step 11
Verify repair and
go to Step 13
Go to Step 12 Diagnostic Aids
Verify repair and
go to Step 13
Refer to
Diagnostic Aids
and go to Step 2
No
Go to Step 8
—
Go to Step 10
—
Refer to
—
Repair is
complete