Lexus SC300 / Lexus SC400. Manual — part 859
Location of Connectors in Instrument Panel (Cont’d)
TR–44
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ENGINE TROUBLESHOOTING
Location of Connectors
Location of Connectors in Body
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ENGINE TROUBLESHOOTING
Location of Connectors
TR–45
CIRCUIT INSPECTION
Diag. Code 12
RPM Signal Circuit (No. 1)
CIRCUIT DESCRIPTION
The distributor in the Engine Control System contains three pick–up coils (G1, G2 and NE).
The G1, G2 signals inform the ECU of the standard crankshaft angle.
The NE signals inform the ECU of the crankshaft angle and the engine speed.
ÑÑÑÑÑ
ÑÑÑÑÑ
Code No.
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Diagnostic Code Detecting Condition
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Trouble Area
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
No ”NE” or ”G1” and ”G2” signal to ECU within 2
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Open or short in NE G circuit
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
No ”NE” or ”G1” and ”G2” signal to ECU within 2
sec after cranking
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Open or short in NE, G circuit.
Distributor
ÑÑÑÑÑ
ÑÑÑÑÑ
12
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
sec. after cranking.
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Distributor
Open or short in STA circuit.
ECU
ÑÑÑÑÑ
ÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Open in ”G”
circuit.
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
O en or short in STA circuit.
ECU
TR–46
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ENGINE TROUBLESHOOTING
Circuit Inspection
DIAGNOSTIC CHART
WIRING DIAGRAM
Check resistance of each pickup coils in
distributor
Check for open and short in harness and
connector between ECU and distributor.
Check air gap.
Check and replace ECU.
Replace distributor.
Repair or rep lace harness or connector.
Replace distributor
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ENGINE TROUBLESHOOTING
Circuit Inspection
TR–47
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