General Precautions of EFI System Maintenance
F-8
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
P-CODE Present P-CODE Present
P0012
P0012
Maintenance tips:
VVT hardware malfunction
Maintenance tips:
1. Unstable idling speed or rough running of engine
may appear.
2. Please check VVT mechanism and replace it
when necessary.
5. P0013: Malfunction of Air Exhaust VVT Open Circuit
P2090: Malfunction of Air Exhaust VVT Short Circuit to Ground
P2091: Malfunction of Air Exhaust VVT Short Circuit to Power Supply
Schematic Circuit:
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function, Digital Multimeter, and
Correct Circuit Diagram)
Description about Malfunction Cause: It is VVT circuit malfunction, which is commonly caused by
VVT’s open circuit, short circuit to ground or short circuit to power supply.
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
P2090, P2091 P0013, P2090, P2091 P2090, P2091 P0013, P2090, P2091
Maintenance tips:
Circuit malfunction
Maintenance tips:
1. Please check wire harness between VVT and ECU
Pin 28# for open circuit, short circuit to ground or
short circuit to power supply;
2. Unstable idling speed or rough running of engine
may appear.
Main relay
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