Drive Cycle # 4: 96-97 1.5L DOHC With MTM
1996-1997 1.5L DOHC ACCENT with MTM -- STEP-BY-STEP:
The chart in this TSB shows the drive cycle for the 1996-1997 1.5L DOHC ACCENT with MTM. The information below discusses, step-by-step, the procedure to be followed.
IMPORTANT
In the case of the 1996 and 1997 Accent, in order to set the CATALYST, EVAP PURGE, 02 SENSOR and 02 SENSOR HEATER monitors to "READY", ALL FOUR of these diagnostic tests must be completed on the same drive. If only three of the four monitors' diagnostics are completed on a test drive, NONE of the Readiness Monitors will indicate "READY", and the drive cycle must be repeated.
The drive cycle described below covers the condition required to run ALL four diagnostic tests in one drive.
STEP 1: (STARTING PROCEDURE)
^ Check to make sure that there are no DTCs stored in the ECM (using the Hi-Scan Pro) and that the Check Engine Light is OFF. If there is a DTC, repair the vehicle first.
^ Check the Readiness Status. The items indicating NOT READY should be CATALYST, EVAP PURGE, 02 SENSOR and 02 SENSOR HEATER.
^ If the MISFIRE, FUEL SYSTEM OR COMPONENT monitors are not ready, then repair any conditions related to these items first.
^ Start the engine.
^ Warm up the engine (coolant temperature at least 176 degrees F).
^ Turn OFF the A/C.
STEP 2: (TRANSIENT TO STEADY STATE DRIVING)
^ Connect the Hi-Scan Pro and go to the "Current Data" menu. The two items to monitor during the drive cycle are the Engine RPM and Engine Load (displayed in milliseconds).
^ IMPORTANT:
Two people should conduct the drive cycle, one person to drive and the other person to monitor the Hi-Scan Pro readings and keep track of the driving time.
^ Drive the vehicle to a light traffic road where the required steady state driving condition can be duplicated.
^ Any kind of driving is OK before the steady state driving is conducted.
STEP 3: (STEADY STATE DRIVING - THIS IS THE MAIN PART OF THE DRIVE CYCLE)
^ Drive the vehicle at a steady state where the engine speed is between 2,000 and 2,500 RPM in high gear (5th speed). The engine load should be between 2.0 and 3.0 ms.
^ Drive in the Steady State Mode for a minimum of 5 minutes.
^ Note:
During this phase of the drive cycle, if the vehicle "falls out" of the steady state zone criteria (in terms of engine RPM and engine load), the accumulated time does not increase; however, there is no need to restart the steady state model. 5 minutes is the required ACCUMULATED time. If the vehicle "falls out" of the criteria, simply stop counting the time and restart counting the time when able to again meet the required criteria.
STEP 3.5: (STEADY STATE DRIVING - PART 2)
^ Drive the vehicle at a steady state where the engine speed is between 2,000 and 2,500 RPM. The engine load should be between 1.4 and 2.2 ms. To drive the vehicle in this steady state mode, very little throttle is required. The different engine loads can be controlled by very carefully moderating the throttle.
^ Drive in the Steady State Mode for a minimum of 5 minutes.
^ Note:
During this phase of the drive cycle, if the vehicle "falls out" of the steady state zone criteria (in terms of engine RPM and engine load), the accumulated time does not increase; however, there is no need to restart the steady state mode. 5 minutes is the required ACCUMULATED time. If the vehicle "falls out" of the criteria, simply stop counting the time and restart counting the time when able to again meet the required criteria.
STEP 4: (TRANSIENT FROM STEADY STATE DRIVING TO AN IDLE STATE)
^ Any kind of driving is OK during this step.
^ Bring the vehicle to a stop at a location where the vehicle may idle.
STEP 5: (IDLE-STATE - THIS IS THE LAST PHASE OF THE DRIVE CYCLE)
^ After coming to a stop, allow the vehicle to idle for one minute (the transmission may be placed in Neutral or Park).
^ After one minute of idling, tip the throttle in and out (to take the engine out of idle-state briefly)
^ Allow the vehicle to idle for one more minute.
STEP 6: (ENGINE STOP)
^ The drive cycle is completed.
^ Turn off the engine (key in the OFF position) and wait 30 seconds.
^ After 30 seconds, restart the engine.
^ IF ONLY ONE DRIVE CYCLE HAS BEEN COMPLETED, CONDUCT ONE MORE DRIVE CYCLE (repeat steps 1 through 6).
^ After the conclusion of the second drive cycle, turn the key to the ON position. Check to see if the Readiness Monitors for the CATALYST, EVAP PURGE, 02 SENSOR and 02 SENSOR HEATER indicate READY.
^ If not, then check to see if there are any DTC codes or if the Check Engine Light is ON. If yes, then repair the vehicle. After repair is completed, conduct the drive cycle two times.
^ If, after the conclusion of the second drive cycle, the Readiness Monitors for CATALYST, EVAP PURGE, 02 SENSOR and 02 SENSOR HEATER still indicate NOT READY, then conduct the drive cycle one more time and check the Readiness Codes again (the previous attempts at the drive cycle may not have been successfully completed).