E.C.C. TROUBLE DIAGNOSES (Models with catalyzer and E.G.R.) — Diagnostic Procedure 3 (Cont'd)
EF & EC-93flowchartE.C.U. input-signal terminal number (38) partly obscured; some harness connector IDs partly occluded. Applies to GA13DS, GA14DS & GA16DS models with catalyzer and E.G.R.
Diagnostic Procedure 3 (Cont'd) — Boost pressure sensor
1
INSPECTION START
2
A: CHECK OVERALL FUNCTION. 1) Start engine and warm it up sufficiently. 2) Set timing light on high tension cable. 3) Check ignition timing at idle under no-load. 4) Disconnect vacuum hose connected to boost pressure sensor and plug vacuum hose. Recheck ignition timing. Ignition timing should retard.
O.K.
INSPECTION END
N.G.
3
B: CHECK POWER SUPPLY. 1) Stop engine. 2) Disconnect boost pressure sensor sub-harness connector. 3) Turn ignition switch "ON". 4) Check voltage between terminal (b) and ground. Voltage: Battery voltage
N.G.
Check the following. - Harness connectors (F34), (M2) - Harness connectors (F31), (E14) - Harness continuity between boost pressure sensor sub-harness connector and E.C.C. relay. If N.G., repair harness or connectors.
Check the following. - Harness connectors (F34), (M2) - Harness connectors (F31), (E14) - Harness continuity between boost pressure sensor sub-harness connector and E.C.C. relay. If N.G., repair harness or connectors.
O.K.
4
C: CHECK GROUND CIRCUIT. 1) Turn ignition switch "OFF". 2) Check harness continuity between terminal (a) and engine ground. Continuity should exist.
N.G.
Repair harness or connectors.
O.K.
5
D: CHECK INPUT SIGNAL CIRCUIT. 1) Disconnect E.C.U. harness connector. 2) Check harness continuity between E.C.U. terminal (38) and terminal (c). Continuity should exist.
N.G.
same as step 4
O.K.
6
CHECK COMPONENT (Boost pressure sensor). Refer to "Electrical Components Inspection". (See page EF & EC-144.)
N.G.
Replace boost pressure sensor.
O.K.
7
Check E.C.U. pin terminals for damage or the connection of E.C.U. harness connector.