1A-116 Engine Control System (4JJ1)
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 E22) 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 E12) and the FT sensor (pin 2 of E22) 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 E22).
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 E22)
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 E12) and the FT sensor (pin 2 of E22) 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 E12) and the FT sensor (pin
1 of E22) 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 E12) and the FT sensor (pin 2 of E22) 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
11
1. Inspect for an intermittent and for poor
connections at the harness connector of the
FT sensor (pins 1 and 2 of E22).
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 15 Go to Step 13
Step Action Value(s) Yes No
LG4JJED-WE-0871.book 116 ページ ２００８年４月４日 金曜日 午前９時６分
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