Toyota Tundra. Manual — part 1404

1. INSPECT STOP LIGHT SWITCH

a. Remove the stop light switch.

b. Measure the resistance according to the value(s) in the table below.

Standard resistance

STANDARD RESISTANCE SPECIFICATION

NG : REPLACE STOP LIGHT SWITCH . (See STOP LIGHT SWITCH ).

Fig. 194: Inspecting Stop Light Switch

OK : Go to Next Step

2. CHECK HARNESS AND CONNECTOR (ECM - BATTERY)

a. Disconnect the A24 ECM connector.

b. Measure the voltage according to the value(s) in the table below.

Item

Measurement Item/ Range

(Display)

Normal Condition

Diagnostic

Note

STOP LIGHT SW (Stop
Light Switch)

Stop light switch status/ ON
or OFF



Brake pedal is
depressed: ON



Brake pedal is
released: OFF

-

Tester Connection

Switch Condition

Specified Condition

1 - 2

Switch pin not pushed

Below 1 ohms

Switch pin pushed

10 kohms or higher

3 - 4

Switch pin not pushed 10 kohms or higher

Switch pin pushed

Below 1 ohms

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Standard voltage

STANDARD VOLTAGE SPECIFICATION

Fig. 195: Identifying A24 ECM Connector

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : REPLACE ECM (See REMOVAL )

DTC P1340 CAMSHAFT POSITION SENSOR "A" (BANK 1 SENSOR 2); DTC P1342 CAMSHAFT
POSITION SENSOR "A" LOW INPUT (MRE); DTC P1343 CAMSHAFT POSITION SENSOR "A"
HIGH INPUT (MRE)

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 engine speed by the NE signal.

DTC DETECTION CONDITION AND TROUBLE AREA

Tester Connection

Condition

Specified Condition

A24-36 (STP) - Body ground Brake pedal is depressed

11 to 14 V

A24-36 (STP) - Body ground Brake pedal is released

Below 1 V

DTC

DTC Detection Condition

Trouble Area

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

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
the actual crankshaft angle and engine speed by the NE signal.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

P1340 camshaft position sensor range check:

Code

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



Camshaft timing pulley LH



ECM

No camshaft position sensor signal to ECM with engine
speed 600 RPM or more

P1342

Output voltage of camshaft position sensor less than 0.3
V for 4 seconds (1 trip detection logic)

P1343

Output voltage of camshaft position sensor more than 4.7
V for 4 seconds (1 trip detection logic)

Related DTCs

P1340: Camshaft position sensor range check
P1340: Camshaft position/Crankshaft position misalignment
P1342: Camshaft position sensor range check (low voltage)
P1343: Camshaft position sensor range check (high voltage)

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: P1340 camshaft position sensor range check
Immediate: P1340 camshaft position/crankshaft position misalignment
and P1342, P1343 camshaft position sensor range check

Sequence of Operation

None

The monitor will run whenever these DTCs are not present

-

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

TYPICAL ENABLING CONDITIONS - P1340 CAMSHAFT POSITION SENSOR RANGE CHECK

P1340 camshaft position/crankshaft position misalignment:

TYPICAL ENABLING CONDITIONS - P1340 CAMSHAFT POSITION/CRANKSHAFT POSITION
MISALIGNMENT

P1342, P1343 camshaft position sensor range check:

TYPICAL ENABLING CONDITIONS - P1342, P1343 CAMSHAFT POSITION SENSOR RANGE
CHECK

TYPICAL MALFUNCTION THRESHOLDS

P1340 camshaft position sensor range check:

TYPICAL MALFUNCTION THRESHOLDS - P1340 CAMSHAFT POSITION SENSOR RANGE
CHECK

P1340 camshaft position/crankshaft position misalignment:

TYPICAL MALFUNCTION THRESHOLDS - P1340 CAMSHAFT POSITION/CRANKSHAFT
POSITION MISALIGNMENT

P1342 camshaft position sensor range check:

TYPICAL MALFUNCTION THRESHOLDS - P1342 CAMSHAFT POSITION SENSOR RANGE
CHECK

P1343 camshaft position sensor range check:

TYPICAL MALFUNCTION THRESHOLDS - P1343 CAMSHAFT POSITION SENSOR RANGE
CHECK

Starter

ON

Minimal battery voltage while starter ON

Less than 11 V

Engine RPM

600 RPM or more

Starter

OFF

Time after ignition switch off to ON

2 seconds or more

Battery voltage

8 V or higher

Starter

OFF

Camshaft position signal

No signal

Camshaft position and crankshaft position phase

Misaligned

Camshaft position sensor voltage

Less than 0.3 V

Camshaft position sensor voltage

Higher than 4.7 V

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra