Subaru LEGACY 2006 Manual page 365

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12.Drive Cycle
A: PROCEDURE
For the troubleshooting, there are five driving patterns of drive cycles A to E. Driving in the specified pattern
allows to diagnose malfunctioning items listed below. After the repair of the following trouble items, be sure
to drive the vehicle with the specified drive patterns to check whether the function is resumed correctly.
1. PREPARATION FOR DRIVE CYCLE
1) Check that the battery voltage is 12 V or more and fuel remains approx. half [20 — 40 2 (5.3 — 10.6 US
gal, 4.4 — 8.8 Imp gal)].
2) After performing the diagnostics and clearing the memory, check for any remaining unresolved trouble da-
ta. <Ref. to EN(H4SO)(diag)-43, Clear Memory Mode.>
3) Disconnect the test mode connector.
NOTE:
• Perform the diagnosis after warming up the engine except when the engine coolant temperature at starting
is specified.
• Perform the diagnosis twice if the DTC marked with *. After completing the first diagnosis, stop the engine
and perform second diagnosis in same condition.
2. DRIVE CYCLE A (AFTER RUNNING 20 MINUTES AT 80 KM/H (50 MPH), IDLE THE ENGINE
FOR 1 MINUTE.)
DTC
*P0125 Insufficient Coolant Temperature For Closed Loop Fuel Control
Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regu-
*P0128
lating Temperature)
*P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
*P0171 System Too Lean (Bank 1)
*P0172 System Too Rich (Bank 1)
P0196 Engine Oil Temperature Sensor Circuit Range/Performance
*P0301 Cylinder 1 Misfire Detected
*P0302 Cylinder 2 Misfire Detected
*P0303 Cylinder 3 Misfire Detected
*P0304 Cylinder 4 Misfire Detected
*P0420 Catalyst System Efficiency Below Threshold (Bank 1)
*P0442 Evaporative Emission Control System Leak Detected (Small Leak)
*P0451 Evaporative Emission Control System Pressure Sensor
*P0456 Evaporative Emission Control System Leak Detected (Very Small Leak)
*P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
*P0459 Evaporative Emission System Purge Control Valve Circuit High
P1443 Vent Control Solenoid Valve Function Problem
*P2096 Post Catalyst Fuel Trim System Too Lean Bank 1
*P2097 Post Catalyst Fuel Trim System Too Rich Bank 1
Drive Cycle
Item
EN(H4SO)(diag)-39
ENGINE (DIAGNOSTICS)
Condition
Coolant temperature at start is less
than 20°C (68°F).
—
—
Complete diagnosis for drive cycle
B or C.
Complete diagnosis for drive cycle
B or C.
—
Complete diagnosis for drive cycle
B or C.
Complete diagnosis for drive cycle
B or C.
Complete diagnosis for drive cycle
B or C.
Complete diagnosis for drive cycle
B or C.
—
Coolant temperature at start is less
than 30°C (86°F).
—
Coolant temperature at start is less
than 30°C (86°F).
Coolant temperature at start is less
than 30°C (86°F).
—
—
Complete diagnosis for drive cycle
B or C.
Complete diagnosis for drive cycle
B or C.