Hummer H2. Manual - part 45

2. Fuel tank level should be between 1/2 and 3/4 fill with 3/4 fill being the most desirable.

3. The Evaporative Monitor can only operate during the first 30 minutes of engine operation. When

executing the procedure for this monitor, stay in part throttle mode and drive in a smooth fashion to
minimize "fuel slosh".

Drive Cycle Procedures

1998 Chevrolet Pickup C1500

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

Fig. 1: Drive Cycle Procedures (2000-2004 Ford, Lincoln & Mercury Vehicles)
Courtesy of FORD MOTOR CO.

1998 Chevrolet Pickup C1500

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

2003-2004 6.0L DIESEL

Description

Primary function of drive cycle procedure is to clear DTC P1000 and to satisfy specifications for SAE J1979.
Each OBD-II monitor must run during drive cycle. If drive cycle has been completed and DTC P1000 is not
cleared, repeat entire drive cycle. If a particular step is interrupted, repeat drive mode. If drive cycle is
interrupted with a key-off, only drive modes that were incomplete must be run.

Performing Drive Cycle

1. Turn ignition on, but do not crank engine until WAIT TO START indicator turns off, or 10 seconds has

passed (whichever is greater).

2. Start engine. Allow engine to idle with transmission in Park or Neutral for 40 seconds.

3. The following conditions must be followed to run certain OBD-II monitors that require engine to be

under a load. Accelerate steadily to 3rd gear (A/T) or 4th gear (M/T) and keep engine speed at 1500 RPM
for 3 seconds. Accelerate steadily from 35 MPH to 65 MPH in about 15 seconds (A/T) or 11 seconds
minimum (M/T). Repeat this procedure 3 times while maintaining conditions set in this step. Before
proceeding, turn all accessories off and disengage TOW/HAUL.

4. Before continuing, using scan tool, select EOT PID from PID/DATA MONITOR & RECORD menu.

Ensure EOT PID value is more than 140°F (60°C). Allow engine to idle for 20 seconds in Park or
Neutral. Turn ignition off. Start engine and allow engine to idle for 40 seconds in Park or Neutral. Repeat
QUICK TEST in appropriate SELF-DIAGNOSTICS article. Drive cycle is complete.

5. If DTC P1000 is present after performing drive cycle, repeat step 3 maintaining a minimum MFDES PID

value of 35 milligrams/stroke with engine speed at more than 2000 RPM for 11 seconds. Also, maintain a
minimum MFDES of 30 milligrams/stroke with engine speed at more than 2800 RPM for at least 6
seconds. Repeat step 4 . MFDES PID value must remain less than 12 milligrams/stroke for 11 seconds.

1996-2004 7.3L DIESEL

Description

Performing Drive Cycle

1. Turn ignition on, but do not crank engine until WAIT TO START indicator turns off, or 10 seconds has

passed (whichever is greater).

NOTE:

Rough road conditions may prevent certain steady state conditions and steady
accelerations from validating the transmission and load-related monitors. On
models with Power Take-Off (PTO), disengage PTO system before performing
drive cycle.

1998 Chevrolet Pickup C1500

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

2. Start engine. Allow engine to idle with transmission in Park or Neutral for 40 seconds.

3. The following conditions must be followed to run certain OBD-II monitors that require engine to be

under a load. On A/T models, select OVERDRIVE CANCEL to perform test in 3rd gear. On all models,
turn on accessories (headlights, A/C compressor, blower fan, etc.). DO NOT use hazards or PTO. Select
an uphill or level road. DO NOT select a downhill road. Driving downhill will unload engine and defeat
test.

4. Accelerate steadily to 3rd gear (A/T) or 4th gear (M/T) and keep engine speed at 1500 RPM for 3

seconds. Accelerate steadily from 35 MPH to 65 MPH in about 15 seconds (A/T) or 11 seconds minimum
(M/T). Repeat this procedure 3 times while maintaining conditions set in step 3) . Before proceeding, turn
all accessories off and disengage OVERDRIVE CANCEL. On A/T models, go to next step. On M/T
models, go to step 6 .

5. On A/T models, drive vehicle in 4th gear continuously for one minute. Accelerate steadily from a full

stop to 4th gear and then return to a full stop. Repeat this procedure 10 times, then go to next step.

6. Before continuing, use NGS tester and select EOT PID from PID/DATA MONITOR & RECORD menu.

7. If DTC P1000 is present after performing drive cycle, repeat step 4 maintaining a minimum MFDES PID

value of 37 milligrams/stroke with engine speed at more than 1500 RPM for 11 seconds. Also, maintain a
minimum MFDES of 37 milligrams/stroke with engine speed at more than 2300 RPM for at least 6
seconds. Repeat step 6 . MFDES PID value must remain less than 12 milligrams/stroke for 11 seconds.

GENERAL MOTORS

DRIVE CYCLE (1996-2000 MODELS)

Description

Several states require that a vehicle pass On-Board Diagnostic (OBD) system tests and the I/M emission
inspection in order to renew license plates. This is accomplished by viewing the I/M system status display on a
scan tool. Using a scan tool, the technician can observe the I/M system status in order to verify that the vehicle
meets the criteria that complies with the local area requirements.

The System Status display indicates only if the PCM has completed the required tests (DTCs). The System
Status display does not necessarily mean that the test has passed. If a failure indication is present for a DTC
associated with one of the systems, that test has failed. Diagnosis and repair are necessary in order to meet the
I/M requirement. Verify that the vehicle passes all of the diagnostic tests associated with the displayed System
Status prior to returning the vehicle to the customer.

WARNING:

Strict observance of posted speed limits and attention to driving
conditions are mandatory when proceeding through the following drive
cycles.

NOTE:

A Drive Cycle may be referred to as Inspection/Maintenance (I/M) Complete
System Set Procedure.

1998 Chevrolet Pickup C1500

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

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