DTC No.
Indicates the diagnostic trouble code.
Page or Instructions
Indicates the page where the inspection procedure
for each circuit is to be found, or gives instructions
for checking and repairs.
Detection Item
Indicates the system of the problem or
contents of the problem.
Trouble Area
Indicates the suspect area of the
problem.
Mass Air Flow Circuit Malfunction
Detection Item
Open or short in mass air flow meter circuit
Mass air flow meter
ECM
DTC No.
(See page)
Trouble Area
MIL*
Memory
P0100
(DI-24)
P0101
(DI-28)
P0115
(DI-33)
Open or short in intake air temp. sensor
circuit
Intake air temp. sensor
ECM
Intake Air Temp. Circuit
Malfunction
P0110
(DI-29)
Open or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
Throttle/ Pedal Position Sensor/Switch
”A” Circuit Malfunction
Engine Coolant Temp.
Circuit Malfunction
Open or short in throttle position sensor circuit
Throttle position sensor
ECM
DTC CHART (SAE Controlled)
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument or other
factors.
If a malfunction code is displayed during the DTC check mode, check the circuit for that code listed in the table
below. For details of each code, refer to the ”See page” under the ”DTC No.” in the DTC chart.
Mass Air Flow Circuit
Range/ Performance Problem
Mass air flow meter
Throttle position sensor
Throttle/ Pedal Position Sensor/ Switch
”A” Circuit Range / Performance Prob-
lem
P0116
(DI-37)
Engine Coolant Temp.
Circuit Range/ Performance Problem
Engine coolant temp. sensor
Cooling system
-
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
IN-29
29
Author:
Date:
2005 LEXUS IS300 (RM1140U)
4.
DIAGNOSTIC TROUBLE CODE CHART
Use Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the table below to determine the trouble
area and proper inspection procedure. The engine diagnostic trouble code chart is shown below as an exam-
ple.