Hummer H2. Manual - part 44

1. Attach a scan tool and access the ECT, FLI, IAT PIDs. Verify the IAT PID is between 50-100°F (10-38°

C). Verify the FLI PID is between 15% and 85% (only available on EVAP Running Loss systems).  

2. Warm the vehicle until the ECT PID reaches a minimum of 130°F (54°C).  

3. Clear all DTC's with the scan tool by pressing clear with the key on engine off. P1000 will remain. Leave 

the key in the ON position, and start the vehicle.  

4. Access the On-Board System Readiness Menu on the scan tool to view the status of the OBD-II monitors. 

5. Proceed with the OBD-II Drive Cycle or selected monitor repair verification drive cycle. Once started, 

the engine must not be turned off.  

OBD-II Drive Cycle 

1. Drive in stop-and-go traffic with at least 4 idle periods (30 seconds each) while observing the status of the 

OBD-II monitor on the scan tool. If the Exhaust Gas Recirculation (EGR), Heated Oxygen Sensor 
(HO2S), Evaporative (EVAP) emission, secondary Air (AIR) (if applicable) or catalyst efficiency 
monitor have not completed, drive on the highway at a constant speed over 40 mph not to exceed 65 mph 
for up to 15 minutes. Heavy accelerations, sudden decelerations and wide open throttles are not 
recommended. If the scan tool sends out a three pulse beep at any time, the OBD-II drive cycle has 
completed. 

If the EGR, HO2S, EVAP, secondary AIR (if applicable) or catalyst efficiency monitor has not 
completed, perform the corresponding monitor verification drive cycle. See MONITOR REPAIR 
VERIFICATION DRIVE CYCLES .  

2. Bring the vehicle to a stop and retrieve Continuous Memory DTCs to verify the DTC P1000 has been 

erased.  

Monitor Repair Verification Drive Cycles 

Comprehensive Component Monitor Repair Verification Drive Cycle 

1. Refer to and complete the Vehicle Application Preparation For OBD-II Drive Cycle before initiating the 

following repair verification steps. See VEHICLE PREPARATION FOR OBD-II OR MONITOR 
REPAIR VERIFICATION DRIVE CYCLE .  

2. Start the engine and go through the entire OBD-II Drive Cycle until the Comprehensive Component 

NOTE:

Vehicles equipped with Power Take Off (PTO) must have this system 
disengaged before proceeding. Verify by viewing the PTO PID for OFF status. 

NOTE:

The IAT PID must be between 50-100°F (10-38°C) during the OBD-II drive cycle 
to enter into all the OBD-II monitors. The FLI PID must be between 15% and 85% 
at all times. 

NOTE:

Vehicles equipped with the EVAP purge flow system or EVAP vapor 
management flow system monitor do not require EVAP monitor 
completion to clear the DTC P1000. 

 

1998 Chevrolet Pickup C1500 

DRIVE CYCLES OBD-II Vehicles - OBD-II Readiness Monitors

  

Monitor shows the completion status by clearing the code P1000 on the scan tool.  

3. If the entire OBD-II Drive Cycle has been performed and the Comprehensive Component Monitor check 

has not completed, rerun Quick Test. See QUICK TEST in appropriate SELF-DIAGNOSTICS article.  

EGR Monitor Repair Verification Drive Cycle (Except Probe) 

1.  

Refer to and complete the Vehicle Application Preparation For OBD-II Drive Cycle before initiating the 
following repair verification steps. See VEHICLE PREPARATION FOR OBD-II OR MONITOR 
REPAIR VERIFICATION DRIVE CYCLE .  

2. Start the engine and drive the vehicle for 6 minutes. Drive in stop-and-go traffic for 5 minutes with at 

least two idle periods. Accelerate to 45 mph (35 mph on Escort/Tracer at more than 1/2 throttle). 
Maintain speed for 1 minute.  

3. Rerun Quick Test. See QUICK TEST in appropriate SELF-DIAGNOSTICS article.  

EGR Monitor Repair Verification Drive Cycle For (Probe) 

1. Refer to and complete the Vehicle Application Preparation For OBD-II Drive Cycle before initiating the 

following repair verification steps. See VEHICLE PREPARATION FOR OBD-II OR MONITOR 
REPAIR VERIFICATION DRIVE CYCLE .  

2. Start the engine and drive the vehicle for 24 minutes. Drive in stop-and-go traffic for 19 minutes with at 

least 4 idle periods. Accelerate to 40 mph at more than 1/2 throttle. Maintain speed for 1 minute. 
Accelerate on highway to 55 mph. Maintain speed for 4 minutes.  

3. Rerun Quick Test. See QUICK TEST in appropriate SELF-DIAGNOSTICS article.  

EVAP Running Loss Monitor System Repair Verification Drive Cycle 

1. Perform the Vehicle Application Preparation for OBD-II Drive Cycle section. See VEHICLE 

PREPARATION FOR OBD-II OR MONITOR REPAIR VERIFICATION DRIVE CYCLE .  

2. With the scan tool, verify the FTP V PID reads between 2.4 and 2.8 volts with the gas cap removed. 

Reinstall gas cap.  

3. With the scan tool, view the OBD-II monitors through the On-Board System Readiness Menu.  

4. Drive the vehicle at a constant speed between 35 mph and 65 mph with throttle as steady as possible. 

Observe the HO2S monitor on the scan tool until it completes (or see FUEL MONITOR OR HO2S 
MONITOR REPAIR VERIFICATION DRIVE CYCLE).  

5. Bring the vehicle to a stop and access the following PIDs with the scan tool: IAT, FLI, FTP, V, 

EVAPPDC and EVAPCV.  

6. Verify the following EVAP monitor entry condition: IAT between 50-100°F (10-38°C).  

7. Drive the vehicle on the highway with a constant speed over 40 mph with throttle as steady as possible. 

During this time, verify the following additional EVAP monitor entry conditions using the FLI and FTPV 
PIDs. FLI stable, plus or minus 5 percent between the limits of 15 and 85 percent tank fill. FTP V stable 

NOTE:

The ambient air temperature or IAT PID must read a minimum of 32°F (0°C) 
to initiate the EGR monitor. 

 

1998 Chevrolet Pickup C1500 

DRIVE CYCLES OBD-II Vehicles - OBD-II Readiness Monitors

  

within plus or minus 0.1 volt.  

8. Prior to running the EVAP monitor, when the EVAPPDC PID is less than 75 percent, the canister vent 

solenoid is open and the system is unsealed. To initiate the EVAP monitor, the EVAPPDC PID must 
increase to at least 75 percent. At this time, the EVAPCV PID will then display 100 percent (canister vent 
solenoid closed to seal the system and the monitor will begin to run. Continue to drive at steady throttle 
with light steering until the EVAPCV PID displays 0 percent (canister vent solenoid open, system 
unsealed). If this step does not occur as described, proceed to the following note, otherwise proceed to 
next step. 

9. Bring the vehicle to a stop.  

10. With the scan tool, view the EVAP monitor for completion through the On-Board System Readiness 

Menu. Repeat step 7 if the EVAP monitor is not complete.  

EVAP Emission Monitor Repair Verification Drive Cycle (Probe) 

1. Check the IAT PID on the scan tool to make sure that the intake air temperature (or ambient temperature) 

is 40°F (4°C) or greater to initiate the drive cycle.  

2. Start the engine and drive the vehicle for 6 minutes. Drive in stop-and-go traffic for 5 minutes with at 

least two idle periods. Accelerate to 40 mph. Maintain speed for 1 minute.  

3. Rerun Quick Test. See QUICK TEST in appropriate SELF-DIAGNOSTICS article.  

Catalyst Monitor Repair Verification Drive Cycle 

1. Refer to and complete the Vehicle Application Preparation For OBD-II Drive Cycle before initiating the 

following repair verification steps. See VEHICLE PREPARATION FOR OBD-II OR MONITOR 
REPAIR VERIFICATION DRIVE CYCLE .  

2. Start the engine and drive the vehicle for 25 minutes. Drive in stop-and-go traffic for 20 minutes, include 

six different constant speeds between 25 and 45 mph. Drive on expressway or highway for an additional 
5 minutes.  

3. Rerun Quick Test. See QUICK TEST in appropriate SELF-DIAGNOSTICS article.  

Fuel Monitor or HO2S Monitor Repair Verification Drive Cycle 

1. Refer to and complete the Vehicle Application Preparation For OBD-II Drive Cycle before initiating the 

following repair verification steps. See VEHICLE PREPARATION FOR OBD-II OR MONITOR 
REPAIR VERIFICATION DRIVE CYCLE .  

2. Start the engine and drive the vehicle for 7 minutes. Drive in stop-and-go traffic for 6 minutes, include 

one idle. Accelerate to 45 mph (35 mph on Escort/Tracer at more than 1/2 throttle). Maintain speed for 1 

NOTE:

During the drive cycle or hot ambient temperatures, fuel vapor (from the 
canister and/or tank) may keep the test from starting. This can be 
observed on the can tool when either the EVAPPDC PID never reaches 75 
percent with stable FLI and FTP PID readings or the EVAPCV PID never 
goes to 100 percent (canister vent never closes) when the EVAPPDC PID 
is above the 75 percent minimum to start the test. 

 

1998 Chevrolet Pickup C1500 

DRIVE CYCLES OBD-II Vehicles - OBD-II Readiness Monitors

  

minute.  

3. Rerun Quick Test. See QUICK TEST in appropriate SELF-DIAGNOSTICS article.  

Misfire Monitor Repair Verification Drive Cycle 

1. For applications with the Fuel Level Input (FLI) circuit to the PCM (terminal No. 12), check the fuel 

gauge and the FLI PID on the scan tool (if available). The Misfire Monitor can only be tested if the fuel 
gauge reads above one quarter full or the FLI PID is above 15 percent (percentage fuel tank fill).  

2. Start the engine and drive the vehicle to a location where speeds can reach 55 to 60 mph and coast down 

to 40 mph without traffic interference.  

3. Accelerate at wide-open throttle to allow vehicle to shift at red-line (if equipped with a tachometer). 

Immediately return to normal speed limits.  

4. Perform the following drive procedure three consecutive times. Accelerate on highway to 60 mph. 

Maintain speed for 30 seconds. Coast down with foot off the accelerator pedal from 60 mph to 40 mph.  

5. Rerun Quick Test. See QUICK TEST in appropriate SELF-DIAGNOSTICS article.  

Secondary Air Monitor Repair Verification Drive Cycle 

1. Refer to and complete the Vehicle Application Preparation For OBD-II Drive Cycle before initiating the 

following repair verification steps. See VEHICLE PREPARATION FOR OBD-II OR MONITOR 
REPAIR VERIFICATION DRIVE CYCLE .  

2. Start the engine and proceed through the entire OBD-II Drive Cycle until the Secondary Air Monitor 

shows the On-Board Readiness Menu completion status on the scan tool.  

3. If the entire OBD-II Drive Cycle has been performed and the Secondary Air Monitor check has not 

completed, rerun Quick Test. See QUICK TEST in appropriate SELF-DIAGNOSTICS article.  

2000-2004 GASOLINE MODELS 

Introduction 

The following procedure is designed to execute and complete the OBD-II monitors and to clear the Ford P1000, 
I/M readiness code. To complete a specific monitor for repair verification, follow steps 1 through 4, then 
continue with the step described by the appropriate monitor found under the "OBD-II Monitor Exercised" 
column. See Drive Cycle Procedures . When the ambient air temperature is outside 40 to 100°F (4.4 to 37.8°
C), or the altitude is above 8000 feet (2438 meters), the EVAP monitor will not run. If the P1000 code must be 
cleared in these conditions, the PCM must detect them once (twice on some applications) before the EVAP 
monitor can be "bypassed" and the P1000 cleared. The EVAP "bypassing" procedure is described in the drive 
cycle. The OBD-II Drive Cycle will be performed using a scan tool. Consult the instruction manual for each 
described function.  

Drive Cycle Recommendations 

1. Most OBD-II monitors will complete more readily using a "steady foot" driving style during cruise or 

acceleration modes. Operating the throttle in a "smooth" fashion will minimize the time required for 
monitor completion.  

 

1998 Chevrolet Pickup C1500 

DRIVE CYCLES OBD-II Vehicles - OBD-II Readiness Monitors