HAIMA 7 - Page 205

General Precautions of EFI System Maintenance
F-69
87. P0604 Electronic Control Unit RAM Malfunction
P0605 Electronic Control Unit ROM Malfunction
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P0604, P0605 P0604, P0605
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) ECU fails and please replace the ECU.
Maintenance tips:
The malfunction has not been finally confirmed, and
it is possibly a random malfunction.。
88. P0606 Electronic Throttle Opening Security Monitoring Malfunction
Description about Malfunction Cause:
Air intake volume of ME7 system is controlled by electronic throttle, and any signal error, software or
hardware errors shall result in electronic throttle out of control, leading to danger due to sudden acceleration
of vehicle. Spare parts and signals relevant to electronic throttle security monitoring malfunction are
electronic throttle pedal and throttle body, cruise control and brake signals.
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function, Digital Multimeter, and
Correct Circuit Diagram)
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
P-CODE Present P-CODE Present
P0606 P0606
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Signal malfunction
2) NLP malfunction
3) SFC malfunction
4） ECU hardware malfunction
Maintenance tips:
The malfunction is not ultimately confirmed and it
may possibly be a random malfunction. Inspect the
following items:
1) Please check signals of electronic throttle pedal
and throttle body, cruise control and brake
signals.
89. P0627 Oil Pump Relay Control Circuit Open
Description about Malfunction Cause:
After engine has been started, the voltage of fuel pump relay circuit is to be measured by the circuit
control module inside ECU, and when the voltage complies with the voltage in the mode of open circuit,
it is determined to be open circuit of fuel pump relay.