Subaru 2002 IMPREZA Service Manual page 653

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK GENERATOR.
1)Start the engine.
2)Idle after warm-up.
3)Measure the voltage between generator B
terminal and chassis ground.
Terminal
Generator B terminal (+) — Chassis
ground (–):
2 CHECK GENERATOR.
1)Run the engine at 5,000 rpm.
2)Measure the voltage between generator B
terminal and chassis ground.
Terminal
Generator B terminal (+) — Chassis
ground ( − − − − ):
3 CHECK BATTERY TERMINAL.
Turn the ignition switch to OFF.
4 CHECK INPUT VOLTAGE OF ECM.
1)Run the engine at idle.
2)Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B136) No. 1 (+) — Chassis ground ( − − − − ):
(B136) No. 2 (+) — Chassis ground ( − − − − ):
5 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
6 CHECK ECM.
1)Connect all connectors.
2)Erase the memory. <Ref. to EN-49, Clear
Memory Mode.>
3)Perform the inspection mode. <Ref. to EN-
42, Inspection Mode.>
4)Read out the DTC. <Ref. to EN-41, Read
Diagnostic Trouble Code (DTC).>
7 CHECK ANY OTHER TROUBLE CODES AP-
PEARANCE.
Check
Is the voltage more than 16.2
V?
Is the voltage more than 16.2
V?
Are the positive and ground
battery terminals tightly
clamped?
Is the voltage more than 16.2
V?
nectors between generator,
battery and ECM?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTC being output?
EN-221
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Repair the genera-
tor. <Ref. to CS-
21, General Diag-
nostic.>
Go to step 3. Repair the genera-
tor. <Ref. to CS-
21, General Diag-
nostic.>
Go to step 4. Tighten the clamp
of terminal.
Go to step 5. Repair the har-
ness connector
between battery,
main relay and
ECM.
Repair the con- Go to step 6.
nector.
Replace the gen- Go to step 7.
erator.
Proceed with the A temporary poor
diagnosis corre- contact.
sponding to the
DTC.
No