1A-294 Engine Control System (4HK1)
7
Important: The exhaust differential pressure
sensor may be damaged if the sensor signal circuit
is shorted to a voltage source.
1. Test the signal circuit between the ECM (pin
67 of J-14) and the exhaust differential
pressure sensor (pin 2 of J-33) 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 exhaust differential pressure 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 79 of J-14) and the exhaust
differential pressure sensor (pin 1 of J-33) 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
exhaust differential pressure sensor (pin 1 of
J-33).
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 79 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
Important: Replacement exhaust differential
pressure sensor must be learned.
Replace the exhaust differential pressure sensor.
Refer to Exhaust Differential Pressure Sensor in
Section 1G Engine Exhaust.
Did you complete the replacement?
—
Go to Step 13
—
12
Important: Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
—
Go to Step 13
—
Step Action Value(s) Yes No
LG4HKED-WE-0871.book 294 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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