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DIAGNOSTICS – SFI SYSTEM 052NP–14
DTC P0340 CAMSHAFT POSITION SENSOR ”A”
CIRCUIT (BANK 1 OR SINGLE SENSOR)
DTC P0341 CAMSHAFT POSITION SENSOR ”A”
CIRCUIT RANGE/PERFORMANCE (BANK 1
SINGLE SENSOR)
CIRCUIT DESCRIPTION
The camshaft position sensor (G2 signal) consists of a magnet, iron core and pickup coil.
The G2 signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil changes,
causing fluctuations in the magnetic field and generating voltage in the pickup coil.
The NE signal plate (crankshaft timing pulley) has 34 teeth and is installed to the crankshaft. The NE signal
sensor generates 34 signals at every engine revolution. The ECM detects the crankshaft angle and the en-
gine revolution based on the NE signals, and the cylinder and the angle of the VVT based on the combination
of the G2 and NE signals.
DTC No. DTC Detection Condition Trouble Area
No camshaft position sensor signal to ECM during cranking
(2 tri
trip detection logic)
P0340
No camshaft position sensor signal to ECM with engine Open or short in camshaft position sensor circuit
speed 600 rpm or more (1 trip detection logic) Camshaft position
osition sensor
While crankshaft rotates twice, camshaft position sensor signal Camshaft timing pulley
is input to ECM 12 times or more (1 trip detection logic) Timing chain has jumped a tooth
P0341 Hint: ECM
Under normal condition, the camshaft position sensor signal
is input into the ECM 3 times per 2 engine revolutions
Reference: Inspection using the oscilloscope.
HINT:
CH1 The correct waveform is as shown on the left.
GND
(G2)
Item Contents
CH1: G2 – NE–
Terminal
CH2 CH2: NE – NE–
(NE) GND Equipment Seting 5V/Division, 20ms/Division
Condition During cranking or idling
A63955 A83873
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DIAGNOSTICS – SFI SYSTEM
MONITOR DESCRIPTION
If there is no signal from the camshaft position sensor despie the engine revolvong, or if the rotation of the
camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.
MONITOR STRATEGY
Camshaft position sensor (bank 1) range check
P0340
or rationality
Related DTCs
Camshaft position sensor (bank 1) range check
P0341
or rationality
Main sensors Camshaft position sensor
Required sensors/components
Related sensors Crankshaft position sensor, engine speed sensor
Frequency of operation Continuous
Duration 5 sec
P0340 case 2 (mis–aligned), P0341: Immediately
MIL operation
P0340 case 1 (no signal): 2 driving cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
Minimum Maximum
The monitor will run whenever the follow-
See ”List of Disable a Monitor” table (On page 05–24)
ing DTCs are not present
P0340 Case 1 (No signal):
Starter ON
Battery voltage while starter is ON – 11 V
P0340 Case 2 (Mis–aligned):
Engine speed 600 rpm –
Starter OFF
P0341:
Engine speed 600 rpm –
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
P0340 Case 1 (No signal):
Camshaft position sensor signal No signal
P0340 Case 2 (Mis–alignet):
Crankshaft/camshaft alignment is mis–aligned (judged by comparing the crankshaft position to the camshaft position)
Camshaft position sensor signal: No input in appropriate timing.
P0341:
Crankshaft/Camshaft alignment Mis–aligned
Camshaft position sensor count 12 or more / 720CA (= Engine 2 revolution)
COMPONENT OPERATING RANGE
Parameter Standard Value
Camshaft position sensor signal input during every 720CA 3
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DIAGNOSTICS – SFI SYSTEM
WIRING DIAGRAM
Refer to DTC P0335 on page 05–156.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand−held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether
the vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich,
etc. at the time of the malfunction.
1 INSPECT CAMSHAFT POSITION SENSOR(RESISTANCE)
Component Side (a) Disconnect the C1 camshaft position sensor connector.
Camshaft Position Sensor (b) Measure the resistance between the terminals of cam-
C1 shaft posision sensor connector.
Resistance:
Tester Connection Specified Condition
1,630 to 2,740 Ω at cold
1–2
2,065 to 3,225 Ω at hot
Front View NOTICE:
A73303 ”Cold” and ”Hot” shown above mean the temperature of
the coils themselves. ”Cold” is from –10C (14F) to 50 C
(122 F) and ”Hot” is from 50 C (122 F) to 100 C (212 F).
(c) Reconnect the camshaft position sensor connector.
NG REPLACE CAMSHAFT POSITION SENSOR
OK
2 CHECK HARNESS AND CONNECTOR(CAMSHAFT POSITION SENSOR – ECM)
Wire Harness Side
(a) Disconnect the C1 camshaft position sensor connector.
Camshaft Position Sensor Connector (b) Disconnect the E5 ECM connector.
(c) Measure the resistance between the wire harness side
C1
connectors.
Standard (Check for open):
Tester Connection Specified Condition
G+ (C1–1) – G2 (E5–26)
Below 1 Ω
G+ G– G– (C1–2) – NE– (E5–34)
Front View
A66132 Standard (Check for short):
Tester Connection Specified Condition
G+ (C1–1) or G2+ (E5–26) – Body ground
10 kΩ or higher
G– (C1–2) or NE– (E5–34) – Body ground
E5 (d) Reconnect the camshaft position sensor connector.
G2
(e) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
NE– ECM Connector A65743
OK
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3 CHECK SENSOR INSTALLATION(CAMSHAFT POSITION SENSOR)
(a) Check that the camshaft position sensor is properly installed.
NG TIGHTEN SENSOR
OK
4 CHECK CAMSHAFT TIMING GEAR ASSY(TEETH OF PLATE)
(a) Check the teeth of the signal plate.
NG REPLACE CAMSHAFT TIMING GEAR ASSY
OK
REPLACE ECM (See page 10–17)
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