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Home >> Subaru >> 1984 >> Brat Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Feedback Carburetor System >> Testing >> Diagnostic Procedure
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Diagnostic Procedure

  1. The ECC system should be considered as a possible source of trouble on engine performance, fuel economy and exhaust emission complaints ONLY after normal checks (which apply to vehicles without ECC) have been performed.
  2. Diagnosis of the ECC system consists of 1 initial check: Diagnostic Circuit Check. This check will specify a specific chart for locating source of problem in ECC system.
  3. When performing tests on ECC system, always insert test meter leads from harness side of connector. Always check connectors while still connected, unless specified otherwise in test charts.
  4. Always perform the Diagnostic Circuit Check before and after any repairs to the ECC system.
Fig 1: ECC Test Connector Locations These connectors are located below steering column.
G42111
ECM TROUBLE CODE IDENTIFICATION

Trouble Code Test Mode Circuit Affected
11 Regular (1) Carter carb. (2) with M/T
12 Regular (1) Carter carb. (3) with A/T
13 Regular (1) Hitachi carb. (4) with Federal M/T
14 Regular (1) Hitachi carb. (5) with A/T
15 Regular (1) Carter carb. (6) with M/T
16 Regular (1) Carter carb. (7) with A/T
17 Regular (1) Hitachi carb. (8) with Federal M/T
18 Regular (1) Hitachi carb. (9) with A/T
22 Test only Car speed sensor no good (with A/T)
23 Regular O2 sensor system is no good
24 Regular (12) Thermo sensor system is no good
25 Regular (13) Thermo sensor system is no good
31 Regular Duty solenoid valve remains on
32 Regular Duty solenoid valve remains off
33 Test only Main system in feedback system no good
34 Regular Backup system is no good, backup memory not HIGH
35 Regular Backup system is no good, backup memory not LOW
42 Test only Vacuum switch II remains on
43 Test only Vacuum switch II remains off
44 Test only Vacuum switch I remains on
45 Test only Vacuum switch I remains off
52 Regular Solenoid valve I remains on
53 Regular Solenoid valve I remains off
54 Regular Auto. choke power remains on
55 Regular Auto. choke power remains off
62 Test only (14) Solenoid valve II remains on
63 Test only (14) Solenoid valve II remains off
73 Regular (10)(1) Hitachi carb. with Cal. M/T
77 Regular (11)(1) Hitachi carb. with Cal. M/T
(1) With engine off, ignition pulse system is no good.
(2) Equipped with analog type speedometer.
(3) Equipped with analog type speedometer.
(4) Equipped with analog type speedometer.
(5) Equipped with analog type speedometer.
(6) Equipped with digital type speedometer.
(7) Equipped with digital type speedometer.
(8) Equipped with digital type speedometer.
(9) Equipped with digital type speedometer.
(10) Equipped with analog type speedometer.
(11) Equipped with digital type speedometer.
(12) With engine water temperature less than 68°F (20°C).
(13) With engine water temperature more than 230°F (110°C).
(14) All 2WD auto. trans. and Federal man. trans. (except 4WD).
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