Lexus >> GS300 – IS250 – IS300 – SC300 (1996 – 2009)

ModeL Year Engine identification System
G5300 3.0L 1996-06 2JZ-GE/3GR-FSE SFI
I5250 2.5L 2006-09 4GR-FSE SFI
I5300 3.0L 2001-05 2JZ-GE SFI
SC300 3.0L 1996-00 2JZ-GE 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.


  • 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 lead for 60 seconds minimum.
  • Reconnect battery ground lead.

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

Trouble code  identification

OBD·II code

Fault location

Probable cause

PO, P2,UO Refer to 080-11 trouble code tables
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
P1200 Fuel pump (FP) relay/ECM – circuit malfunction Wiring, fuel pump/control module, ECM
P1235 Fuel high-pressure pump – circuit malfunction Wiring, fuel high-pressure pump, ECM
P1276 D Injector, cylinder 1 – circuit malfunction Wiring, fuse, injector, ECM
P1277 D Injector, cylinder 2 – circuit malfunction Wiring, fuse, injector, ECM
P1278 D Injector, cylinder 3 – circuit malfunction Wiring, fuse, injector, ECM
P1279 0 Injector, cylinder 4 – circuit malfunction Wiring, fuse, injector, ECM
P127A 0 Injector, cylinder 5 – circuit malfunction Wiring, fuse, injector, ECM
P127B D Injector, cylinder 6 – circuit malfunction Wiring, fuse, injector, ECM
P12FF Engine control module (ECM), injector driver- circuit malfunction Wiring, fuel injector, ECM
P1300 Ignition control – circuit malfunction Wiring, ignition module, ECM
P1335 Crankshaft position (CKP) sensor – no signal Wiring, CKP sensor, starter motor, ECM
P1346 Variable valve timing sensor – LH bank – range/performance problem Valve timing, ECM
P1349 Variable valve timing system – circuit 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
P1420 Evaporative emission (EVAP) system – small leak EVAP canister, EVAP canister purge valve, hose leak
P1421 Evaporative emission (EVAP) system – large leak EVAP canister, EVAP canister purge valve, hose leak
P1422 Fuel tank system/small leak detected – mechanical fault Fuel tank system, fuel pump control module
P1423 Fuel tank system/small leak detected – mechanical fault Fuel tank system, fuel pump control module
P1424 Fuel tank system/leak – mechanical fault Fuel tank system, fuel pump control module
P1450 Fuel tank pressure sensor- circuit malfunction Wiring, fuel tank pressure sensor, ECM
P1451 Fuel tank pressure sensor, range/performance problem – circuit malfunction Wiring, fuel tank pressure sensor, ECM
P1452 Fuel tank pressure sensor, low input – circuit malfunction Wiring, fuel tank pressure sensor, ECM
P1453 Fuel tank pressure sensor, high input – circuit malfunction Wiring, fuel tank pressure sensor, ECM
P1500 Starter signal – circuit malfunction Wiring, ignition switch, starter relay, ECM
P1520 Stop lamp switch – signal malfunction Wiring, stop lamp switch, ECM
P1565 Cruise control switch – circuit malfunction Wiring, cruise control switch, ECM
P1600 Engine control module (ECM) -supply voltage Wiring, ECM
P1605 Knock control – malfunction ECM
P1616 Controller area network (CAN) data bus- communication malfunction Wiring, cruise control module, ECM
P1617 Cruise control module – circuit malfunction Wiring, cruise control module, ECM
P1633 Engine control module (ECM) – throttle actuator control (TAC) system – malfunction ECM
P1645 Body control module (BCM) – malfunction 8CM, AJC control module, wiring
P1656 Oil control valve – malfunction Wiring, oil control valve, ECM
P1780 Park/neutral position (PNP) switch Wiring, PNP switch, ECM
82785 Ignition switch ON – malfunction Ignition switch, engine control relay, wiring
82786 Ignition switch OFF – malfunction Ignition switch, engine control relay, wiring
82791 Key unlock warning switch – malfunction Wiring, key unlock warning switch, engine control relay
82795 Unrecognized key code Key, incorrect key
82796 Immobilizer system – no communication Key, transponder, wiring, ECM
82797 Communication malfunction 1 – interference Incorrect key has been used, wiring, ignition module, ECM
82798 Communication malfunction 2 Key, transponder, ignition module, wiring, ECM