Subaru Impreza 2003, Service Manual

Page: 456 / 3610

EN(H4SO)-44
ENGINE (DIAGNOSTICS)
DRIVE CYCLE
13.Drive Cycle
A: OPERATION
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 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 12V or more.
2) After performing the diagnostics and cleaning memory, check for any remaining unresolved trouble data.
<Ref. to EN(H4SO)-46, Clear Memory Mode.>
3) Separate the test mode connector.
NOTE:
• Except for the water temperature specified items at starting, the diagnosis is carried out after engine 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 Item Condition
P0067 Air Assisted Injector Control Circuit High
Coolant temperature at start is
less than 60
°
C (140
°
F).
*P0111 Intake Air Temperature Circuit Range/Performance
Coolant temperature at start is
less than 30
°
C (86
°
F).
*P0121 Throttle/Pedal Position Sensor/Switch “A” Circuit Range/Performance —
*P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
Coolant temperature at start is
less than 20
°
C (68
°
F).
*P0133
O
2
Sensor Circuit Slow Response (Bank 1 Sensor 1)
—
*P0171 System too Lean (Bank 1) —
*P0172 System too Rich (Bank 1) —
*P0420 Catalyst System Efficiency Below Threshold (Bank 1) —
*P0483 Cooling Fan Rationality Check —
*P0506 Idle Control System RPM Lower Than Expected —
*P0507 Idle Control System RPM Higher Than Expected —
P0562 System Voltage Low —
P0563 System Voltage High —
P1137 O
2
Sensor Circuit (Bank1 Sensor1) —