Isuzu 4HL1, Workshop Manual

Page: 194 / 267

1A-192 Engine Control System
8
Repair or replace the faulty harness.
Is the action complete?
—
Verify repair and
go to Step 9 —
9
Review the DTC.
1. Certainly connect the FT sensor and
ECM connectors.
2. Using Tech 2, clear the DTC.
3. Perform test run and review the DTC.
Is DTC211 detected?
—
Go to Step 10
Refer to
Diagnostic Aids
10
Check the FT sensor output voltage.
1. Install Tech 2.
2. Starter switch "ON", and display the
engine data.
3. Observe the "Fuel Temperature Sensor"
display for output voltage.
Was the voltage within range?
Approx. 1.5 V
(ECT: 80°C)
Go to Step 19 Go to Step 11
11
Check the FT sensor output voltage.
Is the voltage 5 V or more?
—
Go to Step 12 Go to Step 14
12
Check the FT sensor circuit for +B short.
1. Starter switch "OFF".
2. Disconnect the ECM.
3. At the ECM connector pins, measure the
resistance.
Was the resistance within range?
Pins 48/46-
109/114/115/
116:
∞ Ω
Go to Step 16 Go to Step 13
13
Repair or replace the faulty harness.
Is the action complete?
—
Verify repair and
go to Step 21 —
14
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?
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 Go to Step 15
15
Repair or replace the faulty harness.
Is the action complete?
—
Verify repair and
go to Step 21 —
Step Action Value(s) Yes No