ES–291
2UZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
DTC
P1340
Camshaft Position Sensor "A" (Bank 1 Sensor
2)
DTC
P1341
Camshaft Position Sensor "A" (Bank 1 Sensor
2)
DESCRIPTION
The camshaft position sensor (G signal) consists of a magnet, iron core and pickup coil.
The camshaft drive gear (LH) has 3 teeth on its inner circumstance. When the camshaft gear rotates, air
gap changes between the protrusion on the gear and the pickup coil. The change affects the magnetic
field and results in changes in the resistance of the MRE element.
The crankshaft signal plate has 34 teeth and is mounted on the crankshaft. The crankshaft position
sensor generates 34 signals at every engine revolution. The ECM detects the standard crankshaft angle
based on the G signal and the actual crankshaft angle and the engine speed by the NE signal.
DTC No.
P1340
P1341
DTC Detection Condition
Trouble Area
No camshaft position sensor signal to ECM during
cranking (2 trip detection logic)
No camshaft position sensor signal to ECM with engine
speed 600 rpm or more
•
•
•
•
Open or short in camshaft position sensor circuit
Camshaft position sensor
Camshaft timing pulley LH
ECM
MONITOR DESCRIPTION
The camshaft position sensor (G signal) consists of a magnet and MRE element.
The camshaft drive gear has 3 teeth on its inner circumference. When the camshaft gear rotates, air gap
changes between the protrusion on the gear and the pickup coil. The change affects the magnetic field
and results in changes in the resistance of the MRE element. The crankshaft angle sensor plate has 34
teeth and outputs 34 signals at every engine revolution. The ECM detects the standard crankshaft angle
based on the G signal and actual crankshaft angle and engine speed by NE signal.
MONITOR STRATEGY
Related DTCs
P1340: Camshaft position sensor range check
P1340: Camshaft position / Crankshaft position misalignment
P1341: Camshaft position sensor malfunction
Required Sensors/Components (Main)
Camshaft position sensor
Required Sensors/Components (Related)
Crankshaft position sensor, Engine speed sensor
Frequency of Operation
Continuous
Duration
5 seconds
MIL Operation
2 driving cycles: Camshaft position sensor range check
Immediate: Camshaft position / Crankshaft position misalignment and
camshaft position sensor malfunction
Sequence of Operation
None
TYPICAL ENABLING CONDITIONS
All:
The monitor will run whenever these DTCs are not present
None
Camshaft position sensor range check:
Starter
ON
Minimal battery voltage while starter ON
Less than 11 V
Camshaft position / Crankshaft position misalignment:
Engine RPM
600 rpm or more
ES
ES–292
2UZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Starter
OFF
Camshaft position sensor malfunction:
Starter
After OFF to ON timing
TYPICAL MALFUNCTION THRESHOLDS
Camshaft position sensor range check:
Camshaft position signal
No signal
Camshaft position / Crankshaft position misalignment:
Camshaft position and crankshaft position phase
Misaligned
Camshaft position sensor malfunction:
ES
Camshaft position and crankshaft position phase
Misaligned
Camshaft position signal per 2 revolutions of crankshaft
12 signals or more
COMPONENT OPERATING RANGE
•
Camshaft position sensor signal
•
Camshaft position sensor voltage fluctuates when the camshaft
rotates
3 signals per revolution of crankshaft
WIRING DIAGRAM
Refer to DTC P0335 (See page ES-189).
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition
information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data
can be helpful in determining whether the vehicle was running or stopped, whether the engine was
warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of
a malfunction.
1
CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)
Wire Harness Side
Camshaft Position Sensor Connector
(a) Disconnect the C1 camshaft position sensor connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage between terminal 3 of the camshaft
position sensor connector and body ground.
Standard voltage
Tester Connection
Specified Condition
C1-3 - Body ground
4.5 to 5.0 V
(d) Reconnect the camshaft position sensor connector.
C1
NG
Front View
A115895E01
REPAIR OR REPLACE HARNESS OR
CONNECTOR
ES–293
2UZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
OK
2
CHECK ECM TERMINAL VOLTAGE
(a) Inspect the ECM using an oscilloscope.
(1) While the engine is idling, check the waveform
between the terminals of the ECM connector.
Standard voltage
ECM Connector
E6
G2+
2 V/DIV.
OK
*1
*3
Specified Condition
G2+ (E6-19) - G2- (E6-29)
Correct waveform is as shown
HINT:
• *1: Crank angle
• *2: 180°
• *3: 120°
• *4: 60°
G2-
ES
REPLACE ECM
*4
*3
*2
Tester Connection
*2
*4
200 ms./DIV.
A115714E01
NG
3
CHECK HARNESS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR)
Wire Harness Side
Camshaft Position Sensor Connector
(a) Disconnect the C1 Camshaft position sensor connector.
(b) Disconnect the E6 ECM connector.
(c) Measure the resistance between wire harness side
connectors.
Standard resistance
Tester Connection
C1
Camshaft position sensor (C1-2) G2+ (E6-19)
Camshaft position senssor (C1-1) G2- (E6-29)
Front View
ECM Connector
E6
Camshaft position sensor (C1-2) or
G2+ (E6-19) - Body ground
Camshaft position sensor (C1-1) or
G2- (E6-29) - Body ground
Specified Condition
Below 1 Ω
10 kΩ or higher
(d) Reconnect the ECM connector.
(e) Reconnect the Camshaft position sensor connector.
NG
G2+
G2A115715E01
REPAIR OR REPLACE HARNESS OR
CONNECTOR
ES–294
2UZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
OK
4
INSPECT SENSOR INSTALLATION
(a) Check the camshaft position sensor installation.
OK:
The camshaft position sensor is installed properly.
NG
REPAIR OR REPLACE SENSOR
Clearance
OK
ES
NG
BR03795E10
OK
5
INSPECT CAMSHAFT TIMING PULLEY LH (SIGNAL PLATE TOOTH)
NG
OK
REPLACE CAMSHAFT POSITION SENSOR
REPLACE CAMSHAFT TIMING PULLEY LH