Lexus >> ES300/ES330/GS400/GS430/LS400/LS430/SC400/SC430 (1994 – 2008)

ModeL Year Engine identification System
ES300 3.0L 1994-03 1MZ-FE SFI
ES330 3.3L 2004-06 3MZ-FE SFI
GS400 4.0L 1998-00 1UZ-FE SFI
GS430 4.3L 2001-08 3UZ-FE SFI
LS400 4.0L 1995-00 1UZ-FE SFI
LS430 4.3L 2001-06 3UZ-FE SFI
SC400 4.0L 1996-00 1UZ-FE SFI
SC430 4.3L 2002-08 3UZ-FE SFI

General information

  • Engine control module (ECM) incorporates self-diagnosis function.
  • Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to workshop.


  • Trouble codes can be displayed by using a Scan Tool connected to the data link connector (DLC) 1.

Erasing – except 2004 LS430/SC430

  • After the faults have been rectified, trouble codes can be erased by using a Scan Tool connected to the data link connector (DLC) or as follows:
  • Ensure ignition switched OFF.
  • Disconnect battery ground cable for 60 seconds minimum.
  • Reconnect battery ground cable.

NOTE: Disconnecting battery ground lead will erase trouble codes but may also erase memory from electronic units such as radio.

Erasing – 2004 LS430/SC430

  • Trouble codes can only be erased by using a Scan Tool connected to the data link connector (DLC).

Trouble code  identification

OBD-11 code Fault location Probable cause
PO,P2,UO Refer to OBD-11 trouble code tables
P1100 Barometric pressure (BARO) sensor- circuit malfunction ECM
P1120 Accelerator pedal position (APP) sensor – circuit malfunction Wiring, APP sensor, ECM
P1121 Accelerator pedal position (APP) sensor – range/performance problem APP sensor, ECM
P1125 Throttle actuator control (TAC) motor- circuit malfunction Wiring, TAC motor, ECM
P1126 Throttle actuator control (TAC) clutch – circuit malfunction Wiring, magnetic clutch, ECM
P1127 Throttle actuator control (TAC) power source- circuit malfunction Wiring, ECM
P1128 Throttle actuator control (TAC) lock- malfunction TAC motor, throttle body, ECM
P1129 Throttle actuator control (TAC) system – malfunction TAC system, ECM
P1130 Heated oxygen sensor (H02S) – LH front – range/performance problem Wiring, H02S, ECM
P1133 Heated oxygen sensor (H02S) – LH front- response malfunction H025
P1135 Heated oxygen sensor (H02S) – LH front – heater circuit malfunction Wiring, H02, ECM
P1150 Heated oxygen sensor (H02S) – RH front- range/performance problem Wiring, H025, ECM
P1153 Heated oxygen sensor (H02S) – RH front – response malfunction H025
P1155 Heated oxygen sensor (H02S) – RH front- heater circuit malfunction Wiring, H025, ECM
P1200 Fuel pump (FP) relay/ECM – circuit malfunction Wiring, fuel pump relay, ECM
P1300 Ignition control- ES300 -+1998/.cylinder   Nos.1-6 – circuit malfunction Wiring, ignition module, ECM
P1300 Ignition control – cylinder No.1 – circuit malfunction Wiring, ignition coil/module, ECM
P1305 Ignition control – cylinder No.2 – circuit malfunction Wiring, ignition coil/module, ECM
P1310 Ignition control – cylinder No.3 – circuit malfunction Wiring, ignition coil/module, ECM
P1315 Ignition control – cylinder No.4 – circuit malfunction Wiring, ignition coil/module, ECM
P1320 Ignition control – cylinder No.5 – circuit malfunction Wiring, ignition coil/module, ECM
P1325 Ignition control – cylinder No.6 – circuit malfunction Wiring, ignition coil/module, ECM
P1330 Ignition control -cylinder No.?- circuit malfunction Wiring, ignition coil/module, ECM
P1335 Crankshaft position (CKP) sensor- no signal Wiring, CKP sensor, starter motor, ECM
P1340 0 Camshaft position (CMP) sensor 2, bank 1 – circuit malfunction Wiring, CMP, mechanical fault; ECM
P1340 f) Ignition control – cylinder No.8 – circuit malfunction Wiring, ignition coil/module, ECM
P1341 Camshaft position (CMP) sensor 2, bank 1 – range/performance problem Wiring, CMP, mechanical fault, ECM
P1345 Variable valve timing sensor – LH bank – circuit malfunction Wiring, valve timing sensor, ECM
P1346 Variable valve timing sensor – LH bank – range/performance problem Valve timing, ECM
P1349 Variable valve timing system – LH bank – malfunction Valve timing, oil control valve, valve timing control module, ECM
P1350 Variable valve timing sensor – RH bank – circuit malfunction Wiring, valve timing sensor, ECM
P1351 Variable valve timing sensor – RH bank – range/performance problem Valve timing, ECM
P1354 Variable valve timing system – RH bank – malfunction Valve timing, oil control valve, valve timing control module, ECM
P1400 Throttle position (TP) sensor 2 – circuit malfunction Wiring, TP sensor, ECM
P1401 Throttle position (TP) sensor 2 – range/   performance problem TP sensor
P1410 Exhaust gas recirculation (EGR) valve position sensor – malfunction Wiring, EGR valve position sensor, ECM
P1411 Exhaust gas recirculation (EGR) valve position sensor – range/performance problem EGR valve position sensor
P1500 Starter signal – circuit malfunction Wiring, ignition switch, engine control relay, ECM
P1520 Stop lamp switch – signal malfunction Wiring, stop lamp switch, ECM
P1565 Cruise control switch – circuit malfunction Wiring, cruise control switch, ECM
P1566 Cruise control switch – circuit malfunction Wiring, cruise control switch, ECM
P1600 Engine control module (ECM) -supply voltage Wiring, ECM
P1605 Knock control – malfunction ECM
P1633 Throttle actuator control (TAC) system – malfunction ECM
P1645 Body control module (BCM) – malfunction BCM, AIC control module, wiring
P1656 Oil control valve – LH bank – malfunction Wiring, oil control valve, ECM
P1663 Oil control valve – RH bank – malfunction Wiring, oil control valve, ECM
P1705 AT – direct clutch speed sensor Wiring, direct clutch speed sensor, ECM
P1725 Input shaft speed (ISS) sensor/turbine shaft speed (TSS) sensor – circuit malfunction Wiring, ISS sensor/TSS sensor, ECM
P1730 Intermediate shaft speed sensor- AT Wiring, intermediate shaft speed sensor, ECM
P1760 AT – pressure control shift solenoid Wiring, shift solenoid, ECM
P1765 AT- pressure control shift solenoid Wiring, shift solenoid, ECM
P1780 Park/neutral position (PNP) switch – circuit malfunction Wiring, PNP switch, ECM
P1815 Shift control solenoid – malfunction Wiring, shift control solenoid, ECM
P1818 Shift control solenoid – circuit malfunction Wiring, shift control solenoid, ECM
B2785 Ignition switch ON – malfunction Ignition switch, engine control relay, wiring
B2786 Ignition switch OFF – malfunction Ignition switch, engine control relay, wiring
B2791 Key unlock warning switch – malfunction Wiring, key unlock warning switch, engine control relay
B2795 Unrecognized key code Key, incorrect key
B2796 Immobilizer system – no communication Key, transponder, wiring, ECM
B2797 Communication malfunction 1 – interference Incorrect key has been used, wiring, ignition module, ECM
B2798 Communication malfunction 2 Key, transponder, ignition module, wiring, ECM
B2799 Immobilizer – malfunction Wiring, immobilizer system, ECM