Engine Control System (4HK1) 1A-129
6
1. Test the signal circuits between the ECM (pins
82 and 90 of E-12) and the FRP sensor (pin 2
of E-19) for the following conditions:
• A short to ground
• A short to the low reference circuit
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 12 Go to Step 11
7
Notice: The FRP 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 FRP sensor (pin
3 of E-19) 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
8
1. Inspect for an intermittent and for a poor
connection at the harness connector of the
FRP sensor (pin 3 of E-19).
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 a poor
connection at the harness connector of the
ECM (pin 87 of E-12).
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 FRP sensor. Refer to Fuel Pressure
Sensor in Section 1D Engine Fuel.
Did you complete the replacement?
—
Go to Step 12
—
11
Important: Replacement ECM must be
programmed.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
—
Go to Step 12
—
12
1. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition?
—
Go to Step 3 Go to Step 13
13
Observe the DTC Information with a scan tool.
Are there any DTCs that you have not
diagnosed?
—
Go to DTC List System OK
Step Action Value(s) Yes No
LG4HKED-WE-0871.book 129 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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