1A-302 Engine Control System (4HK1)
4
1.
Turn OFF the ignition.
2.
Disconnect the PTO throttle sensor harness
connector.
3.
Turn ON the ignition, with the engine OFF.
Is the PTO Remote Throttle Sensor parameter
less than the specified value?
0.1 volts
Go to DTC P0641
Go to Step 7
5
1.
Turn OFF the ignition.
2.
Disconnect the PTO throttle sensor harness
connector.
3.
Turn ON the ignition, with the engine OFF.
Is the PTO Remote Throttle Sensor parameter
less than the specified value?
0.1 volts
Go to Step 6
Go to Step 7
6
Connect a test lamp between the low reference
circuit (pin 3 of J-39) and battery voltage.
Does the test lamp illuminate?
—
Go to Step 9
Go to Step 8
7
Important:
The PTO throttle sensor may be
damaged if the sensor signal circuit is shorted to a
voltage source.
1.
Test the signal circuit between the ECM (pin
70 of J-14) and the PTO throttle sensor (pin 2
of J-39) for the following conditions:
• A short to battery or ignition voltage
• A short to any 5 volts reference
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 13
Go to Step 12
8
Notice:
The PTO throttle 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 41 of J-14) and the PTO throttle
sensor (pin 3 of J-39) for an open circuit or
high resistance.
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 13
Go to Step 10
9
1.
Inspect for an intermittent and for a poor
connection at the harness connector of the
PTO throttle sensor (pin 3 of J-39).
2.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 13
Go to Step 11
10
1.
Turn OFF the ignition.
2.
Disconnect the ECM harness connector.
3.
Inspect for an intermittent and for a poor
connection at the harness connector of the
ECM (pin 70 of J-14).
4.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 13
Go to Step 12
11
Replace the PTO throttle sensor.
Did you complete the replacement?
—
Go to Step 13
—
Step
Action
Value(s)
Yes
No
LG4HKED-WE-0871.book 302
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２００７年１１月２９日 木曜日 午後６時２９分
