Engine Control System (4HK1) 1A-305
5
Turn the idle up sensor to lowest position (full
counterclockwise direction).
Is the Idle Up Sensor parameter less than the
specified value?
0.1 volts
Go to Step 6 Go to Step 9
6
1. Turn OFF the ignition.
2. Disconnect the idle up sensor harness
connector.
3. Connect a DMM between the 5 volts reference
circuit (pin 3 of B-87) and a known good
ground.
4. Turn ON the ignition, with the engine OFF.
Is the DMM voltage more than the specified
value?
4.5 volts
Go to Step 7 Go to Step 11
7
Connect a 3-amp fused jumper wire between the 5
volts reference circuit and the signal circuit (pins 2
and 3 of B-87).
Is the Idle Up Sensor parameter more than
the specified value?
4.5 volts
Go to Step 15 Go to Step 12
8
1. Turn OFF the ignition.
2. Disconnect the idle up sensor harness
connector.
3. Turn ON the ignition, with the engine OFF.
Is the Idle Up Sensor parameter less than the
specified value?
0.1 volts
Go to DTC P0641 Go to Step 13
9
1. Turn OFF the ignition.
2. Disconnect the idle up sensor harness
connector.
3. Turn ON the ignition, with the engine OFF.
Is the Idle Up Sensor parameter less than the
specified value?
0.1 volts
Go to Step 10 Go to Step 13
10
Connect a test lamp between the low reference
circuit (pin 1 of B-87) and battery voltage.
Does the test lamp illuminate?
—
Go to Step 15 Go to Step 14
11
Notice: The idle up sensor shares the 5 volts
reference circuit with other sensors. A fault
condition in the 5 volts reference circuit may set
DTCs on sensors that share this circuit.
1. Test the 5 volts reference circuit between the
ECM (pin 42 of J-14) and the idle up sensor
(pin 3 of B-87) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 19 Go to Step 16
Step Action Value(s) Yes No
LG4HKED-WE-0871.book 305 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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