HFM-SFI
Note. Vehicle is equipped with On-Board Diagnostics II (OBD-II).
The HFM-SFI system is equipped with a self-diagnostic capability for trouble shooting. Vehicles are tested reading stored Diagnostic Trouble Codes (DTCs). Diagnostic modules are now referred to as diagnostic module (OBD-II). Diagnostic information can be retrieved using a generic scan tool or Hand-Held Tester (HHT) (965 589 00 01 00) and Multiplexer Cable (965 589 00 40 00). Control module will permit testing approximately 10 seconds after engine starting procedure is completed.
PRETEST CONDITIONS
Start and run engine until engine oil temperature is 176°F (80°C). Turn air conditioning off. Ensure shift lever is in Park. Check all fuses and replace as necessary. Verify battery voltage is 11-14 volts.
Note. For component locations, see THEORY/OPERATION - GASOLINE article.
SERVICE PRECAUTIONS
When servicing vehicle, the following precautions must be followed when using Hand-Held Tester (HHT)
- DO NOT connect or disconnect Hand-Held Tester (HHT) to vehicle with ignition on. Voltage is supplied to HHT through data link connector.
- ALWAYS connect multiplexer cable to HHT first, then to data link connector.
- DO NOT connect HHT to 110-volt or 220-volt power source.
- Keep HHT away from strong magnetic fields, such as welding equipment.
- DO NOT expose HHT to water, brake fluid, thinners, etc.
RETRIEVING CODES
Note. On HFM-SFI vehicles, only Diagnostic Trouble Codes (DTCs) are used to diagnose vehicle.
Note. During Diagnostic Trouble Code (DTC) retrieval, CHECK ENGINE light will illuminate continuously.
DTC memory can be cleared using generic scan tool or Hand-Held Tester (HHT). After clearing DTC memory, using generic scan tool or HHT, give "end" command and turn ignition off for approximately 5 seconds. Turning ignition off for approximately 5 seconds allows DTC memory to be overwritten. An alternative method of clearing DTC memory is to disconnect vehicle battery.