Isuzu 4HL1 Workshop Manual page 194

1A-192 Engine Control System
Step
Repair or replace the faulty harness.
8
Is the action complete?
Review the DTC.
1. Certainly connect the FT sensor and
ECM connectors.
9
2. Using Tech 2, clear the DTC.
3. Perform test run and review the DTC.
Is DTC211 detected?
Check the FT sensor output voltage.
1. Install Tech 2.
2. Starter switch "ON", and display the
engine data.
10
3. Observe the "Fuel Temperature Sensor"
display for output voltage.
Was the voltage within range?
Check the FT sensor output voltage.
11
Is the voltage 5 V or more?
Check the FT sensor circuit for +B short.
1. Starter switch "OFF".
2. Disconnect the ECM.
12
3. At the ECM connector pins, measure the
resistance.
Was the resistance within range?
Repair or replace the faulty harness.
13
Is the action complete?
Check the FT sensor circuit harness for open
wiring or short.
1. Starter switch "OFF".
2. Disconnect the ECM.
3. Disconnect the FT sensor connector.
4. At the ECM connector, measure the
resistance.
Was the resistance within range?
14
Repair or replace the faulty harness.
15
Is the action complete?
Action Value(s)
Verify repair and
—
go to Step 9
—
Go to Step 10
Approx. 1.5 V
(ECT: 80°C)
Go to Step 19
—
Go to Step 12
Pins 48/46-
109/114/115/
116:
∞ Ω
Go to Step 16
Verify repair and
—
go to Step 21
Pins 46-48
(jumpered:
pins 1-2): 0 Ω
(not jumpered):
∞ Ω
Pins 46-
ground
(jumpered:
pins 1-
ground): 0 Ω
(not jumpered):
∞ Ω
Pins 48-
ground
(jumpered:
pins 2-
ground): 0 Ω
(not jumpered):
∞ Ω
Go to Step 16
Verify repair and
—
go to Step 21
Yes No
Refer to
Diagnostic Aids
Go to Step 11
Go to Step 14
Go to Step 13
Go to Step 15
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