Isuzu 2008MY N Series, Руководство по ремонту

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Engine Control System (4HK1) 1A-53
11
1. Turn OFF the ignition.
2. Reconnect the ECM harness connector if
disconnected.
3. Replace the ECM main relay with the glow
relay or replace with a known good relay.
4. Turn ON the ignition, with the engine OFF.
5. Attempt to establish communication with the
ECM.
Does the scan tool communicate with the
ECM?
—
Go to Step 16 Go to Step 12
12
1. Turn OFF the ignition.
2. Remove the ECM main relay.
3. Turn ON the ignition, with the engine OFF.
4. Using a test lamp, check for both voltage
supply circuit to the ECM main relay (pins 1
and 2 of X-18).
5. Repair the open circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 18 Go to Step 13
13
1. Reinstall the ECM main relay.
2. Turn the ignition ON and OFF while listening
of feeling for the ECM main relay click. Wait 7
seconds between transitions.
Does the ECM main relay click when the
ignition switch is turned ON or OFF?
—
Go to Step 15 Go to Step 14
14
Repair the ECM main relay ground circuit between
the ECM main relay (pin 5 of X-18) and chassis
ground terminal (J-13) for the following conditions:
•
An open circuit
•
High resistance or a poor connection at the ECM
main relay or ground terminal
Did you complete the repair?
—
Go to Step 18
—
15
1. Test the battery voltage circuit between the
ECM (pins 2 and 5 of J-14) and the ECM main
relay for the following conditions:
• An open circuit
• High resistance or a poor connection at
the ECM or ECM main relay
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 18 Go to Step 17
16
Replace the ECM main relay.
Did you complete the replacement?
—
Go to Step 18
—
17
Important: Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
—
Go to Step 18
—
Step Action Value(s) Yes No
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