Engine Control System (4JJ1) 1A-141
5
Connect a DMM between the signal circuit (pin 1 of
E20) and a known good ground.
Is the DMM voltage more than the specified value?
5.5 volts
Go to Step 12 Go to Step 6
6
Is the DMM voltage more than the specified value
at Step 5?
4.5 volts
Go to Step 7 Go to Step 11
7
1. Connect a test lamp between the signal circuit
(pin 1 of E20) and a known good ground.
2. Connect a DMM between the probe of the test
lamp and a known good ground.
Is the DMM voltage more than the specified value?
4.5 volts
Go to Step 13 Go to Step 8
8
Connect a DMM between the 5 volts reference
circuit and low reference (pins 2 and 3 of E20).
Is the DMM voltage more than the specified value?
4.5 volts
Go to Step 14 Go to Step 10
9
Notice: The CKP 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 95 of E12) and the CKP sensor (pin
3 of E20) 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 15
10
Notice: The CKP 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 CKP sensor
(pin 2 of E20) 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 15
11
1. Test the signal circuit between the ECM (pin
107 of E12) and the CKP sensor (pin 1 of E20)
for the following conditions:
• An open circuit
• A short to ground
• A short to the low reference circuit
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 19 Go to Step 15
12
Important: The CKP sensor may be damaged if
the sensor signal circuit is shorted to a voltage
source.
1. Test the signal circuit between the ECM (pin
107 of E12) and the CKP sensor (pin 1 of E20)
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 19 Go to Step 18
Step Action Value(s) Yes No
LG4JJED-WE-0871.book 141 ページ ２００８年４月４日 金曜日 午前９時６分
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