Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
226
S/N
Step
Check result
Subsequent step
Yes
Repair or replace
the harness
3
Check if the circuit of power supply side of engine malfunction lamp
is open or short to ground.
No
Next step
Yes
Repair or replace
the harness
4
Check if the circuit connecting pin of engine malfunction lamp
control side to Pin 23# of ECU is open or short to power source or
ground.
No
Next step
Yes
Diagnosis help
5
Check if the bulb of engine malfunction lamp operates normally.
No
Replace the bulb
II. Diagnosis by Trouble Phenomena
1. Instruction
Before carrying out the trouble diagnosis steps with the engine trouble phenomenon, it is necessary to
firstly conduct the preliminary check:
1) Confirm that the malfunction indicator lamp of engine operates normally.
2) Check with trouble diagnoses apparatus to confirm that there is no trouble information record.
3) Confirm existence of the trouble complain from owner and the conditions about the occurrence of
the trouble.
And then check the appearance:
1) Check fuel pipes for leakage.
2) Check vacuum pipes for breakage or kink and proper connection.
3) Check intake pipes for blockage, leakage, flatness or damage.
4) Check high-voltage wire of ignition system for broken, aging, verify correct ignition sequence.
5) Check grounding position of wire harness for clean and firm.
6) Check the connector of each sensor and actuator for the looseness or poor contact.
Attention: If any of above-mentioned phenomena exists, firstly conduct maintenance operation
against it; otherwise the following trouble diagnosis and maintenance will be affected.
2. Diagnosis Help
1) Confirm that there is no trouble record related to engine.
2) Confirm the existence of the trouble complained by the owner.
3) The check has been done with steps above, and there is nothing unusual found.
4) It is not permitted to neglect the effects of the maintenance of vehicle, cylinder pressure,
mechanical ignition timing and fuel etc. on the system during the Repair process.
5) Replace the ECM to test.
If the trouble phenomenon can be cleared at this time, it means the trouble site is at ECM; if the trouble
