Drive Cycle - Subaru Legacy 2003 Service Manual

13.Drive Cycle

A: OPERATION
There are 3 drive patterns for trouble diagnosis.
Driving in the specified pattern allows to diagnose
the malfunctioning items listed below. After the
malfunctioning items listed below are repaired, al-
ways check whether they correctly resume their
functions by driving in the required drive pattern.
1. PREPARATION FOR THE DRIVE CYCLE
1) Make sure that fuel remains approx. half amount
[20 to 40 2 (5.3 — 10.6 US gal, 4.4 — 8.8 Imp
gal)], and battery voltage is 12V or more.
2. AFTER RUNNING 20 MINUTES AT 80 KM/H (50 MPH), IDLE ENGINE FOR 1 MINUTE.
DTC
No.
P0030 HO2S Heater control circuit (Bank 1 Sensor 1)
*P0111 Intake air temperature circuit range/performance
Insufficient coolant temperature for closed loop
*P0125
fuel control
*P0130 O2 Sensor circuit (Bank 1 Sensor 1)
O2 Sensor circuit slow response (Bank 1 Sensor
*P0133
1)
Catalyst system efficiency below threshold (Bank
*P0420
1)
Evaporative emission control system purge con-
P0459
trol valve circuit high
*P0461 Fuel level sensor circuit range/performance
*P0464 Fuel level sensor circuit intermittent
*P1137 O2 Sensor circuit (Bank 1 Sensor 1)
3. IDLE FOR 10 MINUTES
NOTE:
Before diagnosis, drive vehicle at 4 km/h (6 MPH) or more.
DTC No.
*P0483 Cooling fan rationality check
*P0506 Idle control system RPM lower than expected
*P0507 Idle control system RPM higher than expected
DRIVE CYCLE
Item
Item
EN(H4SO)-45
2) After performing diagnostics and cleaning the
memory, check for any remaining unresolved trou-
ble data. <Ref. to EN(H4SO)-47, Clear Memory
Mode.>
3) Separate test mode connector.
NOTE:
• Except for water temperature specified items at
starting, diagnosis is carried out after engine warm
up.
• Carry out diagnosis which is marked * on DTC
twice, Then, after finishing 1st diagnosis, stop en-
gine and do the second time at the same condition.
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 20°C (68°F).
ENGINE (DIAGNOSTICS)
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