Manual

Toyota/Lexus

FAULT CODE DEFINITIONS (1 - 16)

45 Chapter 5

TOYOTA/LEXUS FAULT CODE DEFINITIONS

IMPORTANT:

Retrieving and utilizing Diagnostic Trouble

Codes (DTCs) for troubleshooting vehicle operation problems is

only one part of an overall diagnostic strategy. Never replace a

part based solely on the DTC definition. Always consult the

vehicle’s service manual for more detailed testing instructions.

Each DTC has a set of testing procedures, instructions and flow

charts that must be followed to confirm the exact location of the

problem. This type of information is found in the vehicle’s

service manual.

Code Description Possible Cause

1 System Normal

2 VAF sensor circuit VAF circuit, ECU

3 No ignition signal Ignition or circuit, coil, ECU

4 ECT sensor circuit ECT sensor or circuit, ECU

5 O2S circuit O2S sensor or circuit, ECU

6 Engine Speed (RPM) sensor circuit Ignitor or circuit, distributor, ECU

7 TPS circuit TPS or circuit, ECU

8 IAT sensor circuit IAT sensor or circuit, ECU

9 VSS circuit VSS sensor or circuit, ECU

10 Starter signal circuit VSS sensor or circuit, main relay

or circuit, ignition circuit, starter

circuit, ECU

11 ECU Power Supply Ignition or circuit, coil, ECU

11 A/C switch ON during code retrieval A/C switch, ECU

11 Closed throttle position switch Throttle position switch or circuit,

OFF during code retrieval ECU

11 Park / Neutral position switch in Park / Neutral switch, start

D during code retrieval switch, ECU

12 Engine Speed (RPM) sensor Distributor or circuit, ignitor or

circuit circuit, starter or circuit, ECU

(non-turbo models); crankshaft

or position sensor / circuit, starter

or circuit, ECU (turbo models)

13 Engine Speed (RPM) sensor above Distributor or circuit, ignitor or

1000 RPM circuit, starter or circuit, ECU

(non-turbo models); crankshaft or

position sensor / circuit, starter or

circuit, ECU (turbo models)

14 Ignition reference no signal Ignition coil, ignitor or circuit, ECU

14 Turbocharger pressure Turbocharger, airflow meter, ECU

16 Transmission control signal Transaxle ECU or circuit, ECU