Service Drive Cycles

To ensure that any fault causing a Diagnostic Trouble Code (DTC) has been successfully resolved, drive cycles have to be carried out. Professional diagnostic equipment, such as Testbook, will indicate the relevant drive cycle to be carried out following the occurrence of a specific P-Code (Pxxxx).

A drive cycle consists of engine start-up, vehicle operation (exceeding starting speed), overrunning and engine stopping. On OBD-II, a drive cycle is simply defined as starting the engine and driving the vehicle long enough to raise the coolant temperature by at least 40 degrees Fahrenheit.

There are 4 sets of Drive Cycles (A – D):

DRIVE CYCLE A:
-Switch ignition on for 30 seconds
-Check with diagnostics for DTC’s
-Ensure engine coolant temperature is less than 60C/140F
-Start engine
-Allow engine to idle for 2 minutes
-Check with diagnostics for DTC.

DRIVE CYCLE B:
-Switch ignition on for 30 seconds
-Check with diagnostics for DTC’s
-Ensure engine coolant temperature is less than 60C/140F
-Start engine
-Allow engine to idle for 2 minutes
-2 light accelerations (0 to 35mph with light pedal pressure)
-2 medium accelerations (0 to 45mph with moderate pedal pressure)
-2 hard accelerations (0 to 55mph with heavy pedal pressure)
-Engine idle for 2 minutes
-Check with diagnostics for DTC’s

DRIVE CYCLE C:
-Switch ignition on for 30 seconds
-Check with diagnostics for DTC’s
-Ensure engine coolant temperature is less than 60C/140F
-Start engine
-Allow engine to idle for 2 minutes
-2 light accelerations (0 to 35mph with light pedal pressure)
-2 medium accelerations (0 to 45mph with moderate pedal pressure)
-2 hard accelerations (0 to 55mph with heavy pedal pressure)
-60mph cruise for 5 minutes
-50mph cruise for 5 minutes
-Engine idle for 2 minutes
-Check with diagnostics for DTC’s

DRIVE CYCLE D:
NOTE: In the final phase of Drive Cycle D, it will be necessary to find a straight piece of road to ensure that:
-The speed does not drop BELOW 35mph
-No traffic conditions are encountered which will force the vehicle to stop
-No excessive use of throttle is used to maintain the 35mph
-Lifting off the throttle completely is NOT required.

-Switch ignition on for 30 seconds
-Check with diagnostics for DTC’s
-Ensure engine coolant temperature is less than 60C/140F
-Start engine
-Allow engine to idle for 2 minutes
-2 light accelerations (0 to 35mph with light pedal pressure)
-2 medium accelerations (0 to 45mph with moderate pedal pressure)
-2 hard accelerations (0 to 55mph with heavy pedal pressure)
-60mph cruise for 5 minutes
-50mph cruise for 5 minutes
-35mph cruise for 5 minutes
-Engine idle for 2 minutes
-Check with diagnostics for DTC’s