Engine Control System (4HK1) 1A-279
5
Connect a 3-amp fused jumper wire between the 5
volts reference circuit and the signal circuit (pins 2
and 3 of B-121).
Is the BARO Sensor parameter more than the
specified value?
4.5 volts
Go to Step 8 Go to Step 7
6
Notice: The BARO 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 61 of J-14) and the BARO sensor
(pin 3 of B-121) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 12 Go to Step 9
7
1. Test the signal circuit between the ECM (pin
71 of J-14) and the BARO sensor (pin 2 of B-
121) 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 12 Go to Step 9
8
1. Inspect for an intermittent and for poor
connections at the harness connector of the
BARO sensor (pins 2 and 3 of B-121).
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 12 Go to Step 10
9
1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for poor
connections at the harness connector of the
ECM (pins 61 and 71 of J-14).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 12 Go to Step 11
10
Replace the BARO sensor. Refer to BARO Sensor
Replacement.
Did you complete the replacement?
—
Go to Step 12
—
11
Important: Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
—
Go to Step 12
—
Step Action Value(s) Yes No
LG4HKED-WE-0871.book 279 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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