Engine Control System (4HK1) 1A-231
Circuit/ System Testing DTC P0687
Step Action Value(s) Yes No
1
Did you perform the Diagnostic System Check
- Engine Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Engine Controls
2
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition?
—
Go to Step 3
Go to Diagnostic
Aids
3
1. Turn OFF the ignition for 30 seconds.
2. Remove the ECM main relay.
3. Turn ON the ignition, with the engine OFF.
Is DTC P0685 set?
—
Go to Step 4 Go to Step 5
4
1. Turn OFF the ignition for 30 seconds.
2. Replace the ECM main relay with the glow
relay or replace with a known good relay.
3. Turn ON the ignition, with the engine OFF.
Does the DTC fail?
—
Go to Step 6 Go to Step 7
5
Repair the short to battery on the battery voltage
feed circuits between the ECM (pins 2 and 5 of J-
14) and the ECM main relay (pin 2 of X-18)
Did you complete the repair?
—
Go to Step 8
—
6
Repair the short to battery on the battery voltage
supply circuits between the ECM (pins 21 and 40 of
J-14) and the ECM main relay (pin 3 of X-18)
Did you complete the repair?
—
Go to Step 8
—
7
Replace the ECM main relay.
Did you complete the replacement?
—
Go to Step 8
—
8
1. Reconnect all previously disconnected relay
or harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Turn ON the ignition.
Did the DTC fail this ignition?
—
Go to Step 3 Go to Step 9
9
Observe the DTC Information with a scan tool.
Are there any DTCs that you have not
diagnosed?
—
Go to DTC List System OK
LG4HKED-WE-0871.book 231 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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