General Precautions of EFI System Maintenance
F-22
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
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P0117 P0117
Maintenance tips:
The malfunction has been confirmed, and the following
problems may possibly exist
1) The circuit for the Pin 39# of ECU and the ground
in short circuit
2) The circuit for the Pin 39# of ECU and the Pin 17#
in short circuit
Maintenance tips:
The malfunction is not ultimately confirmed and it
may possibly be a random malfunction. Inspect the
following items:
1) Measure the electric resistance between the
Pin 39# of ECU and the ground.
2) Measure the electric resistance between the
Pin 39# of ECU and the Pin 17#.
23. P0118 Engine Coolant Temperature Sensor Circuit Voltage too High
Description about Malfunction Cause:
After engine has been started, ECU performs continuous monitoring over the water temperature of engine,
and the system will determine it to be the circuit of engine water temperature sensor short to power supply, if
it is found that the engine water temperature exceeds the upper limit value set by the system.
Schematic Circuit:
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function, Digital Multimeter, and
Correct Circuit Diagram)
instrument
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