Engine Control System (4HK1) 1A-203
Circuit/ System Testing DTC P0503 (Model without ABS)
7
1.
Test the vehicle speed signal circuit between
the ECM (pin 19 of J-14) and the EHCU (pin
14 of J-22) 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 poor
connections at the harness connector of the
EHCU (pins 14 of J-22).
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 19 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
Important:
Replacement EHCU must be
programmed.
Replace the EHCU. Refer to EHCU in Section 4C1
ABS/ASR.
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
—
12
1.
Reconnect all previously disconnected fuse or
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
1
Did you perform the Diagnostic System Check
- Engine Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Engine Controls
Step
Action
Value(s)
Yes
No
LG4HKED-WE-0871.book 203
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２００７年１１月２９日 木曜日 午後６時２９分
