1A-126 Engine Control System (4HK1)
3
Observe the Fuel Temperature (FT) Sensor
parameter with a scan tool.
Is the FT Sensor parameter more than the
specified value?
4.8 volts
Go to Step 4
Go to Diagnostic
Aids
4
1.
Turn OFF the ignition.
2.
Disconnect the FT sensor harness connector.
3.
Connect a DMM between the signal circuit
(pin 2 of E-22) and a known good ground.
4.
Turn ON the ignition, with the engine OFF.
Is the DMM voltage more than the specified
value?
5.5 volts
Go to Step 5
Go to Step 6
5
Important:
The FT sensor may be damaged if the
sensor signal circuit is shorted to a voltage source.
1.
Test the signal circuit between the ECM (pin
83 of E-12) and the FT sensor (pin 2 of E-22)
for a short to battery or ignition voltage.
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 15
Go to Step 14
6
Connect a 3-amp fused jumper wire between the
signal circuit and the low reference circuit (pins 1
and 2 of E-22).
Is the FT Sensor parameter less than the
specified value?
0.1 volts
Go to Step 10
Go to Step 7
7
Connect a 3-amp fused jumper wire between the
signal circuit of the sensor harness (pin 2 of E-22)
and a known good ground.
Is the FT Sensor parameter less than the
specified value?
0.1 volts
Go to Step 9
Go to Step 8
8
1.
Test the signal circuit between the ECM (pin
83 of E-12) and the FT sensor (pin 2 of E-22)
for an open circuit or high resistance.
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 15
Go to Step 12
9
Notice:
The FT sensor shares the low reference
circuit with other sensors. A fault condition in the
low reference circuit may set DTCs on sensors that
share this circuit.
1.
Test the low reference circuit between the
ECM (pin 109 of E-12) and the FT sensor (pin
1 of E-22) for an open circuit or high
resistance.
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 15
Go to Step 12
10
1.
Test the signal circuit between the ECM (pin
83 of E-12) and the FT sensor (pin 2 of E-22)
for a short to any 5 volts reference circuit.
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 15
Go to Step 11
Step
Action
Value(s)
Yes
No
LG4HKED-WE-0871.book 126
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