Toyota COMPUTER-CONTROLLED SYSTEM Training Manual page 152

DIAGNOSIS - Diagnostic Code s
ncrcnicrv%,c
Examples of diagnostic codes of OBD-II com- OBD-II system has a check mode function in
patible engines in vehicles sold in the U .S .A . which detection of a problem has greater sen-
and Canada are show below . In the same sitivity than the normal mode .
manner as the conventional OBD system, th e
• Camry 1 MZ-FE engine (1994 model year )
COD E
NO
CIRCUITRY
"CHECK
ENGINE"
DIAGNOSIS
TROUBLE AREA
MEMOR Y .
LAMP • ~
(MEANING OF TROBLE
CODE )
P0100
Mass air flow circuit
ON
Open or short in mass air flow meter circuit with • Open or short in mass air flow meter circui t
malfunction engine speed 4,000 rpm or less
• Mass air flow meter
0
• EC U
Conditions a) and b) continue with engine spee d
Mass air flow circuit 900 rpm or less :
P0101
range/performance ON
(2 trip detection
logic)
`3
• Mass air flow meter
0
problem
a) Closed throttle position switch : O N
b) Mass air flow meter output > 2 .2 V
• Open or short in intake air temp . senso r
P0110
Intake air temp . circuit
lf i
ON Open or short in intake air temp . sensor circuit
circuit O
ma unct on
• Intake air temp . senso r
• EC U
• Open or short in engine coolant temp .
P0115
Engine coolant temp . ON Open or short in engine coolant temp . sensor
sensor circuit
circuit malfunction circuit
• Engine coolant temp . sensor
O
• EC U
Engine coolant temp .
20 min . or more after starting engine, engin e
P0116 circuitrange/ ON
coolant temp . sensor value is 30°C (86°F) of • Engine
coolant temp .
sensor
0
performance problem
less
• Coolant syste m
(2 trip detection logic)' 3
+ 1
* 2
*3
"ON" displayed in the diagnosis mode column indicates that the "CHECK ENGINE" warning light is
lighted up when a malfunction is detected .
"0" in the memory column indicates that a diagnostic code is recorded in the ECU memory when a
malfunction is detected . Accordingly, output of diagnostic results in normal or test mode is perform-
ed with the ignition switch ON .
" 2 trip detection logic" ( See page
134) .
140