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Does anyone know what the drive cycle for a 1998 GMC Jimmy is? Please I need help!!
- Thread starter samira
- Start date
Molson02536
New member
Motor's OBD II Drive Cycle Guide (the MIL must be off):
Step 1: Connect a scan tool and check monitor status and precondition.
Step 2: Start the engine and let it idle for at least 2 minutes.
Step 3: Drive at 25 mph or more for at least 50 seconds; be sure engine speed remains above 900 rpm.
Step 4: Stop the vehicle and allow the engine to idle for at least 40 seconds.
Step 5: Repeat Steps 2 to 4 ten times.
Step 6: Check the monitor status; it should switch to Complete. If it doesn't, be sure all enabling criteria are met.
Step 7: If the monitor has not switched to Complete, turn the ignition off and repeat Steps 2 through 5.
Step 8: The readiness status may not switch to Complete if a pending DTC is detected. Perform a second drive cycle to confirm the DTC. Once a second drive cycle is completed, a current DTC will be stored.
Break down:
There is no drive trace as a whole, however, some monitor cycles are similar and may pass through simultaneously
Catalyst monitor:
Pre-req: no codes present, IAT between -4 and 176 deg f; ECT is above 75 deg f; barometric pressure above 72kPa, STET between -20% and 20 %
-Idle vehicle 5 minutes until it is in closed loop
-drive 5 min at steady speed above 50 mph
-idle 2 min in drive (auto) or neutral (manual)
*very stable idle is required to pass this monitor
EGR Monitor:
Pre-req: no codes present, ECT is above 75 deg f; barometric pressure above 72kPa
1. Idle vehicle 5 minutes until it is in closed loop
2. Accelerate and drive for 1 min at steady speed above 50 mph
3. coast vehicle down to 20 mph (vehicle in drive or w/ clutch engaged, brake off)
4. repeat steps 2 and 3 four times
* the GM egr runs during the deceleration portion of the drive trace
Evaporation Monitor:
Pre-req: no codes present, IAT & ECT between 45 and 85 deg f: barometric pressure above 75 kPa, fuel tank level between 26 and 74 %; TPS between 9& 35 %; evap solenoid is at 50% pwm within 65 sec of engine run time
-Idle vehicle 5 minutes until it is in closed loop
-drive 5 min at steady speed between 30 and 40 mph
-stop and idle 2 min
O2 Sensor Monitor:
Pre-req: no codes present, IAT above 32 deg f; ECT is avove 167 deg f
-Idle vehicle 5 minutes until it is in closed loop
-drive 3 min at steady speed above 50 mph
-drive 2 min at steady 40 mph
-drive 2 min at steady 50 mph
Step 1: Connect a scan tool and check monitor status and precondition.
Step 2: Start the engine and let it idle for at least 2 minutes.
Step 3: Drive at 25 mph or more for at least 50 seconds; be sure engine speed remains above 900 rpm.
Step 4: Stop the vehicle and allow the engine to idle for at least 40 seconds.
Step 5: Repeat Steps 2 to 4 ten times.
Step 6: Check the monitor status; it should switch to Complete. If it doesn't, be sure all enabling criteria are met.
Step 7: If the monitor has not switched to Complete, turn the ignition off and repeat Steps 2 through 5.
Step 8: The readiness status may not switch to Complete if a pending DTC is detected. Perform a second drive cycle to confirm the DTC. Once a second drive cycle is completed, a current DTC will be stored.
Break down:
There is no drive trace as a whole, however, some monitor cycles are similar and may pass through simultaneously
Catalyst monitor:
Pre-req: no codes present, IAT between -4 and 176 deg f; ECT is above 75 deg f; barometric pressure above 72kPa, STET between -20% and 20 %
-Idle vehicle 5 minutes until it is in closed loop
-drive 5 min at steady speed above 50 mph
-idle 2 min in drive (auto) or neutral (manual)
*very stable idle is required to pass this monitor
EGR Monitor:
Pre-req: no codes present, ECT is above 75 deg f; barometric pressure above 72kPa
1. Idle vehicle 5 minutes until it is in closed loop
2. Accelerate and drive for 1 min at steady speed above 50 mph
3. coast vehicle down to 20 mph (vehicle in drive or w/ clutch engaged, brake off)
4. repeat steps 2 and 3 four times
* the GM egr runs during the deceleration portion of the drive trace
Evaporation Monitor:
Pre-req: no codes present, IAT & ECT between 45 and 85 deg f: barometric pressure above 75 kPa, fuel tank level between 26 and 74 %; TPS between 9& 35 %; evap solenoid is at 50% pwm within 65 sec of engine run time
-Idle vehicle 5 minutes until it is in closed loop
-drive 5 min at steady speed between 30 and 40 mph
-stop and idle 2 min
O2 Sensor Monitor:
Pre-req: no codes present, IAT above 32 deg f; ECT is avove 167 deg f
-Idle vehicle 5 minutes until it is in closed loop
-drive 3 min at steady speed above 50 mph
-drive 2 min at steady 40 mph
-drive 2 min at steady 50 mph