Diagnostic Fault Information
Important: Always perform the
Inspection/Maintenance (I/M) System Check
prior to using this diagnostic
procedure.
Description
The purpose of the Inspection/Maintenance (I/M) complete system set procedure
is to satisfy the enable criteria necessary to execute all of the I/M readiness diagnostics
and complete the drive cycles for those particular diagnostics. When all I/M monitored
diagnostic tests are completed, the I/M System Status indicators are set to YES. Perform
the I/M Complete System Set Procedure if any I/M System Status indicators are set
to NO.
I/M Data List
To determine if the I/M readiness diagnostic tests can be run this ignition
cycle, use a scan tool to observe the I/M monitor enabled parameters in the I/M Data
List.
Conditions for Meeting a Cold Start
• | The ignition voltage between 11-18 volts. |
• | The barometric pressure (BARO) is more than 75 kPa. |
• | The start-up engine coolant temperature (ECT) is between 4-30°C
(39-86°F). |
• | The start-up intake air temperature (IAT) is between 4-30°C
(39-86°F). |
• | The difference between the IAT and the ECT is 6°C (10.8°F) |
• | The ambient air temperature is between 4-30°C (39-86°F). |
• | Fuel level is between 15-85 percent |
Circuit/System Verification
Review the I/M Status indicators with a scan tool. All I/M System Status indicators
should report YES.
Inspection/Maintenance (I/M) System Set Procedure
Important: Whenever the ignition is turned ON, ignition
positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. After verifying
the enable criteria, turn OFF the ignition for approximately 5 minutes to allow
the sensors to cool before continuing with the test. Once the engine is started, do
NOT turn the engine OFF for the remaining portion of the set procedure.
- Ensure that the vehicle meets the conditions for a cold start listed above.
⇒ | If the evaporative emission (EVAP) I/M System Status indicator displays
NO, perform the EVAP Service bay test if available. |
⇒ | If the EVAP Service bay test is NOT available, it may take up to 6 drive
cycles, with up to 17 hours between drive cycles, for the EVAP I/M System Status indicator
to transition to YES. |
⇒ | If the O2S Heater System Status indicator displays NO, ensure that the
ignition has been turned OFF for at least 10 hours. |
- Set the vehicle parking brake and ensure the vehicle is in park for automatic
transmission or neutral for manual transmission.
- Turn OFF all accessories; HVAC system, other electrical loads, including
aftermarket/add-on equipment, etc.
- Start and idle the engine for at least 2 minutes and until 65°C
(149°F) is achieved.
- Run the engine for 6.5 minutes within the following conditions:
• | MAF parameter between 4-30 g/s |
• | Engine speed steady between 1000-3000 RPM |
- Return the engine to idle for 1 minute.
- Apply and hold brake pedal, and shift to Drive for automatic, or apply
clutch pedal for manual and operate the vehicle within the following conditions for
2 minutes:
• | Depress the accelerator pedal until throttle position (TP) sensor angle
is more than 2 percent. |
• | Mass air flow (MAF) signal between 15-30 g/s |
• | RPM steady between 1200-2000 RPM |
Important: Do NOT touch the accelerator pedal during
the idle period. A change in TP Sensor angle or an increase in engine speed may invalidate
this portion of the test.
- Release the accelerator pedal and shift the vehicle to Park for
automatic, or Neutral and release clutch pedal for manual, and allow the engine to
idle for 2 minutes.
- Quickly depress the accelerator pedal until TP Sensor Angle is more than
8 percent and return to idle, repeat 3 times.
- Allow engine to idle for at least 2 minutes.
Caution: Refer to Road Test Caution in the Preface section.
- Release the parking brake and drive vehicle at 24 km/h (15 mph)
or slower for 2 minutes.
- Continue to drive the vehicle for at least 5.5 miles between 45-112 km/h
(28-70 mph) with the vehicle reaching at least 80 km/h (50 mph).
- Release the accelerator pedal for at least 2 seconds. This will
allow the vehicle to enter decel fuel cut-off.
- Depress the accelerator pedal until the TP Sensor angle is increased 3-20 percent
and maintain a safe speed for 1 minute.
- Safely stop the vehicle, with the engine in drive for automatic or in
neutral with the clutch pedal depressed and parking brake applied for manual, idle
for 2 minutes.
- Shift to Park for automatic and apply the parking brake, or neutral and
release clutch pedal for manual.
Important: Do NOT disturb the vehicle or turn ON the
ignition until told to do so. Disturbing the vehicle may invalidate this portion of
the test.
- Turn OFF the ignition and exit the vehicle. Do NOT disturb the vehicle for 60 minutes.
- Observe the Inspection/Maintenance (I/M) System Status with a scan tool.
All of the I/M System Status indicators should display YES.
⇒ | If the EVAP I/M System Status indicator displays NO, turn OFF the ignition
for 17 hours, ensure that the vehicle meets the conditions for a cold start,
and repeat steps 12-18 six more times, or until the EVAP I/M System Status indicator
transitions to YES. If the indicator continues to display NO, refer to the
Inspection/Maintenance (I/M) System DTC Table
to identify
the DTCs that did not run. Follow the Conditions for Running the DTC in order to set
the EVAP I/M System Status indicator |
⇒ | If any of the I/M System Status indicators display NO, refer to the
Inspection/Maintenance (I/M) System DTC Table
for the
indicator which did not display YES. The I/M System DTC Table identifies the DTCs
associated with each I/M System Status Indicator. Follow the Conditions for Running
the DTC in order to set the associated status indicator. |