Lexus SC300 / Lexus SC400. Manual — part 848
DIAGNOSTIC CODE CHART (Cont’d)
TR–18
–
ENGINE TROUBLESHOOTING
Diagnostic Code Chart
Trouble Area
”CHECK”
Engine Warning
Light *
Memory*
See Page
Trouble Area
Normal
Mode
Test
Mode
Memory
See Page
•
Open or short in air flow meter circuit.
•
Air flow meter
•
ECU
ON
N.A.
•
ECU
ON
ON
•
Open or short in throttle position sensor circuit.
•
Throttle position sensor
ON
ON
Throttle osition sensor
•
ECU
•
No. 1 speed sensor
•
Combination meter
•
Open or short in No. 1 speed sensor circuit.
•
ECU
ON
ON
•
Open or short in starter signal circuit.
•
Open or short in ignition switch or main relay circuit.
•
ECU
N.A.
OFF
X
•
Open or short in sub–throttle position sensor circuit.
•
Sub–throttle position sensor
OFF
ON
Sub throttle osition sensor
•
ECU
•
Open or short in No. 1 knock sensor circuit.
•
O en or short in No. 1 knock sensor circuit.
•
No. 1 knock sensor (looseness)
ON
N.A.
No. 1 knock sensor (looseness)
•
ECU
•
ECU
ON
N.A.
X
•
Open or short in No. 2 knock sensor circuit.
•
O en or short in No. 2 knock sensor circuit.
•
No. 2 knock sensor (looseness)
ON
N.A.
No. 2 knock sensor (looseness)
•
ECU
–
ENGINE TROUBLESHOOTING
Diagnostic Code Chart
TR–19
DIAGNOSTIC CODE CHART (Cont’d)
*1: ”ON” displayed in the diagnosis mode column indicates that the ”CHECK” Engine Warning Light is
lighted up when a malfunction is detected. ”OFF” indicates that the ”CHECK” does not light up during
malfunction diagnosis, even if a malfunction is detected. ”N.A.” indicates that the item is not included
in malfunction diagnosis.
*2: ”O” in the memory column indicates that a diagnostic code is recorded in the ECU memory when a mal-
function occurs. ”X” indicates that a diagnostic code is not recorded in the ECU memory even if a mal-
function occurs. Accordingly, output of diagnostic results in normal or test mode is performed with the
IG switch ON.
*3: Only for USA specification vehicles.
TR–20
–
ENGINE TROUBLESHOOTING
Diagnostic Code Chart
Trouble Area
”CHECK”
Engine Warning
Light*
Memory*
See Page
Trouble Area
Normal
Mode
Test
Mode
Memory
See Page
•
Open or short in EGR step motor circuit.
ON
N A
O en or short in EGR ste motor circuit.
•
ECU
ON
N.A.
•
Open in EGR gas temp. sensor circuit.
ON
ON
O en in EGR gas tem . sensor circuit.
•
ECU
ON
ON
•
Open or short in fuel pump ECU circuit.
•
Fuel pump ECU
•
Engine & ECT ECU power source circuit.
•
Fuel pump
•
Engine & ECT ECU
ON
ON
•
A/C switch circuit
•
Throttle position sensor IDL circuit
•
Neutral start switch circuit.
•
Accelerator pedal and cable
•
ECU
N.A.
OFF
X
*4:
This indicates items for which ”2 trip detection logic” is used. With this logic, when a logic malfunction is
first detected, the malfunction is temporarily stored in the ECU memory. If the same case is detected again
during the second drive test, this second detection causes the ”CHECK” Engine Warning Light to light up.
The 2 trip repeats the same mode a 2nd time. (However, the IG switch must be turned OFF between the
1st trip and 2nd trip).
In the Test Mode, the ”CHECK” Engine Warning Light lights up the 1st trip a malfunction is detected.
–
ENGINE TROUBLESHOOTING
Diagnostic Code Chart
TR–21
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