General Precautions of EFI System Maintenance
F-5
II. Diagnosis Flow for Inspection and Maintenance by ME7 System
according to P-CODE
Descriptions:
1. Te following items of inspection and maintenance are performed only after the malfunction has been
confirmed to be a steady-state malfunction currently, and otherwise it will lead to diagnostic errors.
2. The “multimeter” mentioned on following occasions indicates the digital multimeter. It is prohibited to
examine the lines of electronic injection system using pointer multimeter.
3. In the case when vehicle with anti-theft system is inspected and repaired, if the occasion for replacement
of ECU appears in the column of “Follow-up Steps”, pay attention that the anti-theft system must be
matched after replacement.
4. In this system: When P-CODEs of P000A, P000B, P0012, P0015, P0170, P0171, P0172, P0219, P0560,
P0562, P0563, P0668, P0704, P1336, P1559, P1564, P1579, P1604, P1651 and P2138 exists, the SVS
and MIL lamps will not turn on in either of the cases.
5. If P-CODE indicates that the voltage of certain circuit is too low, it indicates that the short circuit to
ground may possibly exist in this circuit. If P-CODE indicates that the voltage of certain circuit is too
high, it indicates that short circuit to power supply may possibly exist in this circuit. If P-CODE indicates
that it is the malfunction of certain circuit, it indicates that open circuit may possibly exist or multiple
line malfunctions exist in this circuit.
6. In this system, the mark is the SVS lamp and the mark is the MIL lamp.
Diagnostic Help:
1. In the case when malfunction cannot be removed, the malfunction belongs to a steady-state
malfunction.
The priority is to be given to examine whether or not loosening effect exists with the joint of wire
harness if it is random malfunction.
2. Examination has been made according to the abovementioned steps, and no anomalies are found.
3. Don’t ignore vehicle maintenance status, cylinder pressure, mechanical ignition timing, and other
factors of impact on the system during inspection and maintenance.
4. Test shall be performed, if ECU is to be replaced.
If the P-CODE can be removed at this point, then the malfunction part is at ECU, and if P-CODE
still cannot be removed at this point, then the original ECU shall be changed back, to carry out the
work on inspection and maintenance once again, in the repeated flow.
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