Toyota Sequoia (2005). Manual - part 127

–

DIAGNOSTICS

ENGINE

DI–303

497

INSPECTION PROCEDURE

1

Read current DTC.

NOTICE:
If P0630 is present, the VIN must be input to the ECM using the hand–held tester. However, all DTCs
are cleared automatically by the tester when inputting the VIN. If DTCs other than P0630 are present,
check them first.

NEXT

2

Input VIN with hand–held tester (See page 

DI–14

).

NEXT

END

DI–304

–

DIAGNOSTICS

ENGINE

498

DTC

P1340, P1341

Camshaft Position Sensor ”A” (Bank
Sensor 1)

CIRCUIT DESCRIPTION

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 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 result in change in the resistance of the MRE element.
The crankshaft signal plate has 32 teeth and is mounted on the crankshaft. The crankshaft position sensor
generates 32 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.

DTC Detecting Condition

Trouble Area

P1340

No camshaft position sensor signal to ECM during cranking 

(2 trip detection logic)

Open or short in camshaft position sensor circuit

Camshaft position sensor

P1340

P1341

No camshaft position sensor signal to ECM with engine speed

600 rpm or more

Camshaft  osition sensor

LH camshaft timing pulley

ECM

MONITOR DESCRIPTION

The camshaft position sensor (G signal) consists of a magnet and MRE element.
The camshaft drive gear has 5 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
result in change in the resistance of the MRE element. The crankshaft angle sensor plate has 32 teeth and
output 32 signals 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

R l t d DTC

P1340

Camshaft position sensor (Bank 1) range check

or rationality

Related DTCs

P1341

Camshaft position sensor (Bank 1) range check

or rationality

R

i d

/

t

Main sensors/components

Camshaft position sensor

Required sensors/components

Related sensors/components

Crankshaft position sensor, Engine speed sensor

Frequency of operation

Continuous

Duration

5 sec.

MIL operation

P1340 case 1 (no signal): 2 driving cycles

P1340 case 2 (mis–aligned), P1341: Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever these

DTCs are not present

See page 

DI–18

P1340 Case 1 (No signal):

Starter

ON

Minimum battery voltage while starter ON

–

11 V

DID8F–01

A23558

C2
Crankshaft Position Sensor

*1: Shielded

C1
Crankshaft Position Sensor

ECM

G–B

(*1)

(*1)

VC

E2

EC

BR

J42
J/C

D

D

BR

2

Y

1

2

L

G

R

G2+

G2–

NE+

NE–

1

23

E8

19

E6

29

E6

21

E6

20

E6

E

E

E

J42 J/C

–

DIAGNOSTICS

ENGINE

DI–305

499

P1340 Case 2 (Mis–aligned):

Engine RPM

600 rpm

–

Starter

OFF

P1341:

Starter

After OFF to ON timing

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

P1340 Case 1 (No signal):

Camshaft position sensor signal

No signal

P1340 Case 2 (Mis–aligned):

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.

P1341:

Crankshaft/Camshaft alignment

Mis–aligned

Camshaft position sensor count

12 or more / 720



CA (= Engine 2 revolutions)

COMPONENT OPERATING RANGE

Parameter

Standard Value

Camshaft position sensor signal input at every 720



CA

3

WIRING DIAGRAM

B17445

Wire Harness Side:

Camshaft Position Sensor

A23559

2 V / DIV

GND

Crank Angle

120

°

120

°

180

°

180

°

60

°

60

°

200 ms /DIV

B17414

E6

ECM Connector

G2+

G2–

DI–306

–

DIAGNOSTICS

ENGINE

500

INSPECTION PROCEDURE

HINT:
Read freeze frame data using hand–held tester. Because freeze frame records the engine conditions when
the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was run-
ning 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

Check voltage of camshaft position sensor power source circuit.

PREPARATION:
(a)

Disconnect the Camshaft position sensor connector.

(b)

Turn the ignition switch to ON.

CHECK:
Measure the voltage between terminal 3 of the camshaft posi-
tion sensor connector and body ground.
OK:

Standard: 4.5 to 5.5 V

NG

Repair or replace harness or connector.

OK

2

Check camshaft position sensor signal.

PREPARATION:
Start the engine.
CHECK:
Check the waveform between the G2+ (E6–19) and G2–
(E6–29) of the ECM connector.
OK:

Standard: Correct waveform is as shown.

OK

 Replace ECM (See page 

IN–35

).

NG