Toyota Tundra. Manual — part 1194

b. Disconnect the D74 ECM connector.

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

Standard resistance (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 115: Identifying D74 ECM Connector Terminals

Tester Connection

Condition Specified Condition

aD1 female connector 2 - D74-94(KNK1)

Always

Below 1 ohms

aD1 female connector 5 - D74-93 (EKNK)

Always

Below 1 ohms

aD1 female connector 4 - D74-117 (KNK2) Always

Below 1 ohms

aD1 female connector 6 - D74-116 (EKN2) Always

Below 1 ohms

Tester Connection

Condition Specified Condition

aD1 female connector 2 or D74-94 (KNK1) - Body ground

Always

10 kohms or higher

aD1 female connector 5 or D74-93 (EKNK) - Body ground

Always

10 kohms or higher

aD1 female connector 4 or D74-117 (KNK2) - Body ground Always

10 kohms or higher

aD1 female connector 6 or D74-116(EKN2) - Body ground

Always

10 kohms or higher

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

OK : Go to next step

3. INSPECT ECM (VOLTAGE)

a. Disconnect the aD1 connector.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

c. Reconnect the aD1 connector.

NG : REPLACE ECM (See REMOVAL )

Fig. 116: Identifying aD1 Connector Terminals

OK : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

4. INSPECT KNOCK SENSOR

a. Disconnect the aD1 connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

NG : Go to step 5

Tester Connection

Switch Condition Specified Condition

aD1 female connector 2 - 5 Ignition switch ON

4.5 to 5.5 V

aD1 female connector 4 - 6 Ignition switch ON

4.5 to 5.5 V

Tester Connection

Condition Specified Condition

aD1 male connector 2 - 5 20°C (68°F) 120 to 280 kohms
aD1 male connector 4 - 6 20°C (68°F) 120 to 280 kohms

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 117: Identifying aD1 Male Connector Terminals

OK : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

5. CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK SENSOR)

HINT:



If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right
bank side.



If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left
bank side.

a. Disconnect the aD1 connector.

b. Disconnect the a1 or a2 knock sensor connectors.

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

Standard resistance (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Condition Specified Condition

aD1 male connector 2 - a2-2 Always

Below 1 ohms

aD1 male connector 5 - a2-1 Always

Below 1 ohms

aD1 male connector 4 - a1-2 Always

Below 1 ohms

aD1 male connector 6 - a1-1 Always

Below 1 ohms

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 118: Identifying A1 Or A2 Knock Sensor Connectors

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : REPLACE KNOCK SENSOR (See REMOVAL )

DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT; DTC P0339 CRANKSHAFT
POSITION SENSOR "A" CIRCUIT INTERMITTENT

DESCRIPTION

The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate and a pickup coil. The sensor plate
has 34 teeth and is installed on the crankshaft. The pickup coil is made of wound copper wire, an iron core and
magnet. The sensor plate rotates and, as each tooth passes by the pickup coil, a pulse signal is created. The
pickup coil generates 34 signals per engine revolution. Based on these signals, the ECM calculates the
crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition timing are
controlled.

Tester Connection

Condition Specified Condition

aD1 male connector 2 or a2-2 - Body ground Always

10 kohms or higher

aD1 male connector 5 or a2-1 - Body ground Always

10 kohms or higher

aD1 male connector 4 or a1-2 - Body ground Always

10 kohms or higher

aD1 male connector 6 or a1-1 - Body ground Always

10 kohms or higher

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra