Isuzu 4HL1 Workshop Manual page 151

Step
Check the exhaust brake solenoid valve
circuit.
1. Starter switch "OFF".
2. Disconnect the VIM.
6
3. Jumper the solenoid valve connector and
measure the resistance at the VIM
connector.
Was the resistance within range?
Check the exhaust brake solenoid valve
circuit.
1. Starter switch "OFF".
2. Disconnect the vehicle side connector
from ECM.
7
3. Jumper the solenoid valve connector and
measure the resistance at the ECM
connector.
Was the resistance within range?
Repair or replace the faulty harness.
8
Is the action complete?
Review the DTC.
1. Using Tech 2, check and store the DTC.
2. Clear the DTC.
9
3. Perform test run and review the DTC.
Is DTC46 detected?
1. Replace the VIM
IMPORTANT:
If necessary (for the vehicle equipped with
10
idle stop function), input the number of
startups to the replacing VIM.
Is the action complete?
Check DTC46 will not be set again.
1. Using Tech 2, clear the DTC.
11
2. Start the engine and review the DTC.
Is DTC46 detected?
Action
Engine Control System 1A-149
Value(s)
Pins 2-
ground
(jumpered:
pins 2-
ground): 0 Ω
(not jumpered):
∞ Ω
Go to Step 7
Pins 75-
ground
(jumpered:
pins 1-
ground): 0 Ω
(not jumpered):
∞ Ω
Go to Step 9
Verify repair and
—
go to Step 11
—
Go to Step 9
—
Verify repair and
go to Step 11
—
Refer to
Diagnostic Aids
and go to Step 2
Yes No
Go to Step 8
Go to Step 8
Refer to
Diagnostic Aids
Repair is
complete
—
—