2005 TOYOTA AVENSIS sensor

A79413
From
Speed SensorSkid
Control
ECU4–Pulse
Combination
Meter4–Pulse
ECM 05–158
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0500 VEHICLE SPEED SENSOR ”A”
CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and sends appropriate signals to the skid control ECU. The skid
control ECU converts these wheel speed signals into a 4–pulse signal and outputs it to the ECM via the com-
bination meter. The ECM determines the vehicle speed based on the frequency of these pulse signals.
DTC No.DTC Detection ConditionTrouble Area
P0500
Conditions (a), (b) and (c) continue for 8 seconds or more
(2 trip detection logic):
(a) Engine coolant temperature is more than 60C (140F)
(b) Engine speed is between 2,000 rpm and 3,000 rpm
(c) No speed signal is input to ECMOpen or short in speed sensor circuit
Speed sensor
Combination meter
ECM
Skid control ECU
05B5L–14

A93655
17
E10SPDECM
V–W 18
C11 Combination Meter
J/C
5
E13 E15 V
BR
EHJ10H
V–W
(LHD) J20H
(RHD)J10H
(LHD) J20H
(RHD)
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–159
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester II. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air–fuel ratio was lean or rich, and other data
from the time the malfunction occurred.
1 CHECK OPERATION OF SPEEDOMETER
(a) Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer reading is normal.
NG CHECK SPEEDOMETER CIRCUIT
(See page 05–1510 of Pub. No. RM1018E AVEN-
SIS)
OK

A83860
Waveform of Heated
Oxygen Sensor
(in front of TWC)Waveform of Heated
Oxygen Sensor
(behind TWC)
Waveform of Heated
Oxygen Sensor
(behind TWC) Normal Catalyst
Deteriorated Catalyst Waveform of Heated
Oxygen Sensor
(in front of TWC) 05–150
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW
THRESHOLD (BANK 1)
CIRCUIT DESCRIPTION
This vehicle has two Heated Oxygen (O2) sensors. One is located in front of the Three–Way Catalyst Con-
verter (TWC), and the other is mounted behind the TWC. Each signal output of the sensors is converted into
a waveform inside the ECM. The front O2 sensor is used to monitor the air–fuel ratio by the ECM, and whose
signal prompts the ECM to perform air–fuel ratio feedback control. As a result, the air–fuel ratio is balanced,
and the waveform of the front O2 sensor oscillates between rich and lean regularly.
To determine whether or not the catalyst performance has deteriorated, the ECM compares the waveforms
of the front and rear O2 sensors. While the catalyst is functioning normally, the waveform of the rear O2 sen-
sor fluctuates between rich and lean more slowly than the front O2 sensor’s waveform. When the rear O2
sensor ’s waveform frequently fluctuates, it indicates that the catalyst performance deteriorates.
05KO7–02

A82718
Signal Length
Time
Sensor
Output
Voltage
Heated Oxygen Sensor Signal Length:
A58686
Vehicle Speed
70 km/h
(44 mph)
Ignition Switch OFF 40 seconds
or more
Engine coolant temperature is more than 75
C (167 F)
20 seconds
or more 40 seconds
or more
40 seconds
or more
(g) (h)
Idling (e) (g)
(h) (g)
(h)
20 seconds
or more 20 seconds
or more
Once
Twice
At least 8 times
2 minutes
or more
(a), (b) and (c)
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–151
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)DTC No.
DTC Detecting ConditionTrouble Area
P0420
After engine and TWC are warmed up, and while vehicle is
driven within predetermined vehicle speed and engine speed
range:
Waveforms of heated oxygen sensor (sensor 2) frequently
fluctuates between rich and lean (2 trip detection logic)
Gas leakage in exhaust system
 Heated oxygen sensor (sensor 1)
 Heated oxygen sensor (sensor 2)
 Three–way catalytic converter (TWC)
CONFIRMATION DRIVING PATTERN
(a) Connect the intelligent tester II to the DLC3.
(b) Turn the ignition switch to ON and turn the intelligent tester ll ON.
(c) Switch the ECM from normal mode to check mode using the intelligent test\
er ll ( see page 05–20).
(d) Start the engine.
(e) Allow the engine to idle for 2 minutes.
(f) Warm up the engine until the engine coolant temperature reaches more than\
75 C (167 F).
(g) Drive the vehicle at 70 km/h (44 mph) or more for 40 seconds or more.
(h) Stop the vehicle and allow the engine to idle for 20 seconds or more.
(i) Repeat the steps (g) and (h) at least 8 times in one driving cycle.
HINT:
If a malfunction exists, the MIL will be illuminated during step (i).

05–152
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
NOTICE:
If the conditions in this test are not strictly followed, no malfunction\
will be detected. If you do not
have the intelligent tester II, turn the ignition switch to OFF after perfor\
ming steps from (d) to (i), then
perform steps (d) to (i) again.
WIRING DIAGRAM
Refer to DTC P0130 on page 05–74.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester II. Freeze frame data record the engine condition\
when
malfunctions are detected. When troubleshooting, freeze frame data can h\
elp determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air–fuel ratio was lean \
or rich, and other data
from the time the malfunction occurred.
1 CHECK OTHER DTC OUTPUT(IN ADDITION TO DTC P0420)
(a) Connect the intelligent tester II to the DLC3.
(b) Turn the ignition switch to ON and turn the intelligent tester ll ON.
(c) Select the following menu items: Powertrain / Engine and ECT / DTC.
(d) Read DTCs.
Result:
Display (DTC Output)Proceed To
P0420A
P0420 and other DTCsB
HINT:
If any DTCs other than P0420 are output, troubleshoot those DTCs first.
B GO TO RELEVANT DTC CHART (See page 05–27 )
A
2 CHECK FOR EXHAUST GAS LEAKAGE
OK: No gas leakage. NG REPAIR OR REPLACE EXHAUST GASLEAKAGE POINT
OK
3 INSPECT HEATED OXYGEN SENSOR(SENSOR 1) ( See page 05–74)
NG REPLACE HEATED OXYGEN SENSOR
OK

–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–153
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
4 INSPECT HE ATED OXYGEN SENSOR(SENSOR 2) ( See page 05–100)
OK: During air–fuel ratio feedback, the oxygen sensor output fluctuat\
es between rich and lean.
NG REPLACE HEATED OXYGEN SENSOR
OK
REPLACE THREE–WAY CATALYTIC CONVERTER (BOTH FRONT AND REAR TWC)
NOTICE:
On the damaged bank, replace both the front and rear catalysts.
HINT:
Intelligent tester II only:
Malfunctioning areas can be found by performing the Active Test / A/F Control operation. The A/F Control
operation can determine if the heated oxygen sensor or other potential trouble ar\
eas are malfunctioning or
not.
(a) Perform the Active Test using the intelligent tester II.
HINT:
The A/F Control operation lowers the injection volume by 12.5 % or incre\
ases the injection volume by 25
%. (1) Connect the intelligent tester II to the DLC3.
(2) Start the engine and turn the intelligent tester II ON.
(3) Warm up the engine by running the engine at 2,500 rpm for approximately 3\
minutes.
(4) On the intelligent tester II, select the following menu items: Powertrain \
/ Engine and ECT / ActiveTest / A/F Control.
(5) Select the following monitor items: O2S B1 S1 and O2S B1 S2.
(6) Perform the A/F Control operation with the engine in an idling condition\
(press the right or left
button).
Result:
The heated oxygen sensor reacts in accordance with increases and decreases \
of the injection
volume:
+25 % → Rich output: More than 0.5 V
–12.5 % → Lean output: Less than 0.4 V
NOTICE:
Sensor 1 (front sensor) has an output delay of a few seconds. Sensor 2 (rea\
r sensor) has a maximum
output delay of approximately 20 seconds.

+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Case 1
Case 2
Case 3
Case 4
Output Voltage of Heated Oxygen
Sensor (sensor 1: front sensor)
Injection volume
Output voltage
Output Voltage of Heated Oxygen
Sensor (sensor 2: rear sensor)Main Suspect
Trouble Area
OK
+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
Sensor 1: front sensor
(Sensor 1, heater, sensor 1
circuit)
+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
+25 %
–12.5 %
Injection volume
Output voltage
NG
+25 %
–12.5 %
Injection volume
Output voltage
NG
+25 %
–12.5 %
Injection volume
Output voltage
NG
+25 %
–12.5 %
Injection volume
Output voltage
NGExtremely rich or lean actual
air–fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost no reaction

Sensor 2: rear sensor
(Sensor 2, heater, sensor 2
circuit)
Almost no reaction Almost no reactionAlmost no reaction
05–154
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
The following A/F Control procedure enables the technician to check and graph the voltage output of both
the heated oxygen sensors.
To display the graph, select the following menu items on the tester: View / Line Graph.

A63955
GND
CH1
(G2+)
CH2
(NE+) GND
05–140
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0340 CAMSHAFT POSITION SENSOR ”A” CIRCUIT (BANK 1 OR SINGLE SENSOR)
DTC P0341 CAMSHAFT POSITION SENSOR ”A” CIRCUIT RANGE/PERFORMANCE (BANK 1
OR SINGLE SENSOR)
CIRCUIT DESCRIPTION
The Camshaft Position (CMP) sensor consists of a magnet and an iron core which is wrapped with coppe\
r
wire, and is installed on the cylinder head. When the camshaft rotates, each \
of 3 teeth on the camshaft
passes through the CMP sensor. This activates the internal magnet in the sensor, generating a voltage in
the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft
turns twice the voltage is generated 3 times in the CMP sensor. The generated voltage in the sensor acts
as a signal, allowing the ECM to locate the camshaft position. This signal is then used to con\
trol ignition tim-
ing, fuel injection timing, and the VVT system.
DTC No.DTC Detection ConditionTrouble Area
P0340
No camshaft position sensor signal to ECM during cranking
(2 trip detection logic)Open or short in camshaft position sensor circuit
 Camshaft position sensor
Camshaft timing pulleyP0340(2 trip detection logic)
No camshaft position sensor signal to ECM at engine speed
of 600 rpm or more (1 trip detection logic)Camshaft timing pulley
 Jumped tooth of timing chain
 ECM
P0341While crankshaft rotates twice, camshaft position sensor signal
is input to ECM 12 times or more (1 trip detection logic)
Open or short in camshaft position sensor circuit
 Camshaft position sensor
 Camshaft timing pulley
 Jumped tooth of timing chain
 ECM
HINT:
DTC P0340 indicates a malfunction related to the CMP sensor (+) circuit (the wi\
re harness between
the ECM and CMP sensor, and the CMP sensor itself).
DTC P0341 indicates a malfunction related to the CMP sensor (–) cir\
cuit (the wire harness between
the ECM and CMP sensor, and the CMP sensor itself).
Reference: Inspection using the oscilloscope.
HINT:
The correct waveform is as shown on the left.
G2+ stands for the camshaft position sensor signal, and
NE+ stands for the crankshaft position sensor signal.
ItemContents
TerminalCH1: G2+ – NE–
CH2: NE+ – NE–
Equipment Setting5V/Division, 20ms/Division
ConditionDuring cranking or idling
WIRING DIAGRAM
Refer to DTC P0335 on page 05–136.
05B5J–14