Lexus GS, SC 1998-06

3.0L L6 VIN D Auto 2

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Trouble Code: P1120



Accelerator Pedal Position Sensor Circuit Malfunction

Possible Causes:



APP sensor circuit is open or shorted to ground
 
APP sensor circuit is shorted to VREF
 
APP sensor power circuit is open between sensor and the PCM
 
APP sensor ground circuit is open between sensor and PCM
 
APP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1121



ETCS Accelerator Pedal Position Sensor Performance

Possible Causes:



APP sensor is damaged or has failed
 
Throttle assembly or throttle linkage is binding or has failed
 
PCM has failed
 

Trouble Code: P1125



ETCS Throttle Control Motor Circuit Malfunction

Possible Causes:



ETCS throttle motor control (+) circuit is open, shorted to ground or to power (B+)
 
ETCS throttle motor control (-) circuit is open, shorted to ground or to power (B+)
 
ETCS throttle motor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1126



Magnetic Clutch Circuit Malfunction

Possible Causes:



ETCS magnetic clutch (+) circuit is open, shorted to ground or to power (B+)
 
ETCS magnetic clutch (-) circuit is open, shorted to ground or to power (B+)
 
ETCS magnetic clutch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1127



ETCS Actuator Power Source Circuit Malfunction

Possible Causes:



Battery connections are dirty or loose
 
ETCS power source circuit is open (check the ETCS fuse)
 
PCM has failed
 

Trouble Code: P1128



ETCS Throttle Control Motor Lock Malfunction

Possible Causes:



ETCS throttle motor is damaged or has failed
 
Throttle body assembly is damaged or stuck closed
 
PCM has failed
 

Trouble Code: P1129



Electric Throttle Control System (ETCS) Malfunction

Possible Causes:



ETCS (system) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1130



A/F Sensor-11 (Bank 1 Sensor 1) Circuit Malfunction

Possible Causes:



A/FS signal circuit or ground circuit is open (intermittent fault)
 
A/FS is contaminated, damaged or has failed
 
PCM has failed
 

Trouble Code: P1133



A/F Sensor-11 (Bank 1 Sensor 1) Slow Response

Possible Causes:



A/F sensor signal circuit or ground circuit is open
 
A/F sensor power circuit is open
 
A/F sensor is contaminated, damaged or has failed
 
Intake air leaks, exhaust manifold leaks or PCV system leaks
 
MAF sensor out of calibration (it may be dirty or contaminated)
 
PCM has failed
 

Trouble Code: P1135



A/F Sensor-11 (Bank 1 Sensor 1) Heater Circuit Malfunction

Possible Causes:



A/F sensor heater circuit or ground circuit is open
 
A/F sensor heater power circuit is open
 
A/F sensor heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P1150



A/F Sensor-21 (Bank 2 Sensor 1) Circuit Malfunction

Possible Causes:



A/FS signal circuit or ground circuit is open (intermittent fault)
 
A/FS power circuit is open (an intermittent fault)
 
A/FS is contaminated, damaged or has failed
 
PCM has failed
 

Trouble Code: P1153



A/F Sensor-21 (Bank 2 Sensor 1) Slow Response

Possible Causes:



A/F sensor signal circuit or ground circuit is open
 
A/F sensor power circuit is open
 
A/F sensor is contaminated, damaged or has failed
 
Intake air leaks, exhaust manifold leaks or PCV system leaks
 
MAF sensor out of calibration (it may be dirty or contaminated)
 

Trouble Code: P1155



A/F Sensor-21 (Bank 2 Sensor 1) Heater Circuit Malfunction

Possible Causes:



A/F sensor heater circuit or ground circuit is open
 
A/F sensor heater power circuit is open
 
A/F sensor heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P1200



Fuel Pump Relay/ECU Circuit Malfunction

Possible Causes:



Fuel Pump ECU control circuit is open or shorted to ground
 
Fuel Pump ECU control circuit is shorted to system power (B+)
 
Fuel Pump ECU power circuit is open (check power from relay)
 
Fuel Pump ECU is damaged or has failed
 
Fuel Pump is damaged or has failed
 
PCM has failed
 

Trouble Code: P1300



Igniter Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open between the igniter and PCM
 
IGT or IGF signal circuit is shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1305



Igniter No. 2 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open or shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1310



Igniter No. 3 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open or shorted to ground
 
Igniter is damaged or has failed
 

Trouble Code: P1315



Igniter No. 4 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open or shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1320



Igniter No. 5 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open between the igniter and PCM
 
IGT or IGF signal circuit is shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1325



Igniter No. 6 Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open between the igniter and PCM
 
IGT or IGF signal circuit is shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1335



Crankshaft Position Sensor Circuit Malfunction

Possible Causes:



CKP sensor (+) circuit is open or shorted to ground
 
CKP sensor (-) circuit is open or shorted to ground
 
CKP sensor (+), (-) circuit is shorted to VREF or system power
 
CKP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1400



Sub-Throttle Position Sensor Circuit Malfunction

Possible Causes:



VTA2 signal circuit is open or shorted to ground
 
Sub-Throttle position sensor VREF or ground circuit is open
 
Sub-Throttle position sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1401



Sub-Throttle Position Sensor Range/Performance

Possible Causes:



Sub-Throttle position sensor is damaged or has failed
 
Throttle linkage or throttle body is binding or sticking
 
PCM has failed
 

Trouble Code: P1405



Turbo Pressure Sensor Circuit Malfunction

Possible Causes:



Boost Pressure sensor signal circuit open or shorted to ground
 
Boost Pressure sensor power or ground circuit is open
 
Boost Pressure sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1406



Turbo Pressure Sensor Circuit Malfunction

Possible Causes:



Boost Pressure sensor signal circuit open or shorted to ground
 
Boost Pressure sensor power or ground circuit is open
 
Boost Pressure sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1500



Starter Signal Circuit Malfunction

Possible Causes:



Engine starter signal circuit is open or shorted to ground
 
Engine starter signal circuit is shorted to system power (B+)
 
Starter has failed
 
PCM has failed
 

Trouble Code: P1511



Turbo Boost Pressure Low Malfunction

Possible Causes:



Actuator for the Waste Gate valve, Intake Air Control valve, Exhaust Gas Control valve is damaged, binding or has failed
 
Intake Air system is clogged or leaking
 
VSV control circuit for the Waste Gate valve, Intake Air Control valve, Exhaust Gas Control valve is open
 
PCM has failed
 

Trouble Code: P1512



Turbo Boost Pressure High Malfunction

Possible Causes:



Waste Gate valve, Intake Air Control valve, Exhaust Gas Control valve has failed
 
Intake Air system is clogged or leaking
 
VSV control circuit for the Waste Gate valve, Intake Air Control valve, Exhaust Gas Control valve is shorted to ground
 
PCM has failed
 

Trouble Code: P1520



Stop Light Switch Circuit Malfunction

Possible Causes:



Stop light switch is shorted to ground
 
Stop light switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1600



PCM Battery Backup Circuit Malfunction

Possible Causes:



Battery backup circuit is open (check EFI fuse and fuse link)
 
Battery terminals are corroded or loose
 
PCM has failed
 

Trouble Code: P1630



Traction Control System Malfunction

Possible Causes:



ETC+ or ETC signal circuit is open, shorted to ground or power
 
EFI+ or EFI- signal circuit is open, shorted to ground or power
 
Throttle Control ECU or the PCM has failed
 

Trouble Code: P1633



Engine Throttle Control System Circuit Malfunction

Possible Causes:



Clear the codes and determine if this code resets. If the same trouble code (P1633 resets), the PCM has failed.
 
TSB TC002-03 (6/03) contains information related to this code
 

Trouble Code: P1780



Park/Neutral Position Switch Circuit Malfunction

Possible Causes:



P/N switch is shorted to ground or wiring harness is shorted
 
P/N switch is out-of-adjustment, damaged or has failed
 
PCM has failed
 

 
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