Engine Control System (4HK1) 1A-177
5
Connect a DMM between the 5 volts reference
circuit and low reference circuit (pin 1 and 5 of E-
15).
Is the DMM voltage more than the specified
value?
4.5 volts
Go to Step 6 Go to Step 9
6
Observe the EGR Position 1, 2 and 3 parameter
with a scan tool while momentarily jumping a 3-
amp fused jumper wire across the EGR valve
harness connector between each signal circuit and
the 5 volts reference circuit.
• EGR position 1: pins 1 and 4 of E-15
• EGR position 2: pins 1 and 3 of E-15
• EGR position 3: pins 1 and 2 of E-15
Is there parameter which did not indicate High
when the circuit is jumpered?
—
Go to Step 10 Go to Step 11
7
Important: The EGR position sensor may be
damaged if the sensor signal circuit is shorted to a
voltage source.
1. Test the signal circuits (which ever parameter
indicates High at Step 3) between the ECM
(pins 93, 94 and 99 of E-12) and the EGR
valve (pins 2, 3 and 4 of E-15) 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 16 Go to Step 15
8
Notice: The EGR position 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 87 of E-12) and the EGR valve (pin
1 of E-15) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 16 Go to Step 13
9
Notice: The EGR position 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 101 of E-12) and the EGR valve (pin
5 of E-15) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 16 Go to Step 13
Step Action Value(s) Yes No
LG4HKED-WE-0871.book 177 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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