Diagnostic Instructions
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 trips 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.
Conditions for Meeting a Cold Start
• | The ignition voltage between 10-15 volts. |
• | The barometric pressure (BARO) is more than 75 kPa. |
• | The engine coolant temperature (ECT) at start-up is less than 42°C (108°F). |
• | The intake air temperature (IAT) is between 2-32°C (36-90°F). |
• | The engine is OFF for greater than 6 hours or the following conditions must be met: |
- | The start-up IAT minus start-up ECT are within 12°C (22°F). |
- | The start-up ECT minus start-up IAT are within 50°C (90°F). |
• | The fuel level is between 25-75 percent. |
Circuit/System Verification
Review the I/M System Status indicators. All I/M System Status indicators should report YES.
Inspection/Maintenance (I/M) System Set Procedure
- Ensure that the vehicle meets the conditions for a cold start listed above.
⇒ | If the EVAP I/M System Status indicator displays NO, perform the EVAP Service bay test if applicable. |
- Turn OFF all accessories; HVAC system, other electrical loads, including aftermarket/add-on equipment, etc., and open the hood.
- Set the vehicle parking brake and ensure the vehicle is in park for automatic transmission or neutral for manual transmission.
- Start and idle the engine for 2 minutes.
Warning: Refer to Road Test Warning in the Preface section.
- Close the hood, release the parking brake and Accelerate at part throttle to 72-80 km/h (45-50 mph) with this speed maintained until the engine reaches operating temperature, 8-10 minutes.
- Continue operation under these conditions for an additional 6 minutes.
- Accelerate at part throttle to 90 km/h (55 mph) with this speed maintained for 2 minutes.
- Release the accelerator pedal for at least 10 seconds. This will allow the vehicle to enter the decel fuel cut-off.
Note: Do NOT touch the accelerator pedal until told to do so. A change in TP Sensor angle or an increase in engine speed may invalidate this portion of the test.
- Safely stop the vehicle, with the engine in drive for automatic or neutral with the clutch pedal depressed and parking brake applied for manual. Allow the vehicle to idle for 2 minutes.
- Shift the vehicle to park for automatic and neutral for manual. Turn OFF the ignition and exit the vehicle. Do NOT disturb the vehicle for 45 minutes.
- Observe the 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, ensure that the vehicle meets the conditions for a cold start, and repeat steps 6-11 three 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. |
⇒ | 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. |