Drive Cycle; Preparation For The Drive Cycle; After Running 20 Minutes At 80 Km/H (50 Mph), Idle Engine For 1 Minute; Idle For 10 Minutes - Subaru LEGACY Service Manual

12.Drive Cycle

A: PROCEDURE
There are three drive patterns for the trouble diagnosis. Driving in the specified pattern allows to diagnose
malfunctioning items listed below. After the malfunctioning items listed below are repaired, always check
whether they correctly resume their functions by driving in the required drive pattern.

1. PREPARATION FOR THE DRIVE CYCLE

1) Make sure that the fuel remains approx. half amount [20 — 40 2 (5.3 — 10.6 US gal, 4.4 — 8.8 Imp gal)],
and battery voltage is 12 V or more.
2) After performing the diagnostics and cleaning memory, check for any remaining unresolved trouble data.
<Ref. to EN(H4SO 2.5)(diag)-41, Clear Memory Mode.>
3) Separate the test mode connector.
NOTE:
• Except for the engine coolant temperature specified items at starting, the diagnosis is carried out after en-
gine warm up.
• Carry out the diagnosis which is marked * on DTC twice, then, after finishing first diagnosis, stop the engine
and do second time at the same condition.

2. AFTER RUNNING 20 MINUTES AT 80 KM/H (50 MPH), IDLE ENGINE FOR 1 MINUTE.

DTC
Insufficient Coolant Temperature for Closed Loop
*P0125
Fuel Control
O Sensor Circuit Slow Response (Bank 1 Sen-
2
*P0133
sor 1)
Catalyst System Efficiency Below Threshold
*P0420
(Bank 1)
Evaporative Emission Control System Purge
P0459
Control Valve Circuit High

3. IDLE FOR 10 MINUTES

NOTE:
Before the diagnosis, drive the vehicle at 10 km/h (6 MPH) or more.
DTC
O Sensor Heater Circuit Range/Performance
2
P0030
(Bank 1 Sensor 1)
Drive Cycle
Item
Item
EN(H4SO 2.5)(diag)-39
Engine coolant temperature is less than 20°C (68°F) at engine start.
ENGINE (DIAGNOSTICS)
Condition
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Condition
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