Toyota Tacoma manuals

Toyota Tacoma (2015-2018) Service Manual: Output Speed Sensor Circuit No Signal (P0722,P077C,P077D)

Toyota Tacoma (2015-2018) Service Manual / Ac60e Automatic Transmission / Transaxle / Automatic Transmission System(for 2tr-fe) / Output Speed Sensor Circuit No Signal (P0722,P077C,P077D)

DESCRIPTION

This sensor detects the rotation speed of the transmission output shaft and sends signals to the ECM. By comparing the input turbine speed signal (NT) with the output shaft speed sensor signal (SP2), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. As a result, the gears shift smoothly.

DTC Code

DTC Detection Condition

Trouble Area

P0722

All conditions are met for 5 seconds or more (2 trip detection logic):

(a) Park/neutral position switch D input signal is ON.

(b) Either condition is met.

  • Gear position is 1st:

    Transmission revolution sensor (NT) value is 1310 rpm or more.

  • Gear position is 2nd, 3rd, 4th, 5th or 6th:

    Transmission revolution sensor (NT) value is 760 rpm or more.

(c) The vehicle speed is 8.99 km/h (5.59 mph) or more.

(d) No signal from transmission revolution sensor (SP2) is input to the ECM.
  • Harness or connector
  • Transmission revolution sensor (SP2)
  • ECM

P077C

When the transmission revolution sensor (SP2) input voltage is below 0.2 V for 4.5 seconds or more (2 trip detection logic).
  • Harness or connector
  • Transmission revolution sensor (SP2)
  • ECM

P077D

When the transmission revolution sensor (SP2) input voltage is higher than 1.8 V for 4.5 seconds or more (2 trip detection logic).
  • Harness or connector
  • Transmission revolution sensor (SP2)
  • ECM

MONITOR DESCRIPTION

The transmission revolution sensor (SP2) detects the transmission output shaft speed. The ECM calculates gear shifts comparing the transmission revolution sensor (NT) with the transmission revolution sensor (SP2).

If the ECM detects no signal from the transmission revolution sensor (SP2) even while the vehicle is moving, it will conclude that there is a malfunction in the transmission revolution sensor (SP2). The ECM will illuminate the MIL and store the DTC.

MONITOR STRATEGY

Related DTCs

P0722: Transmission revolution sensor (SP2)/Verify pulse input

P077C: Transmission revolution sensor (SP2)/Range check (Low voltage)

P077D: Transmission revolution sensor (SP2)/Range check (High voltage)

Required sensors/Components

Transmission revolution sensor (NT), Transmission revolution sensor (SP2)

Frequency of operation

Continuous

Duration

P0722: 5 sec.

P077C, P077D: 4.5 sec.

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All:

Battery voltage

8 V or higher

Ignition switch

ON

Starter

OFF
P0722:

Vehicle speed

8.99 km/h (5.59 mph) or more

Shift change

Shift change is completed before starting next shift change operation

R position switch

OFF

Park/neutral position switch (NSW)

OFF

Engine

Running

Transmission range switch circuit fail (P0705)

(Pending + MIL)

Not detected

Output speed sensor range check fail (P077C, P077D)

(Pending / MIL)

Not detected

Either of the following conditions is met

Conditions 1 or 2

1. All of the following conditions are met

-

ECM selected gear

1st

Turbine speed sensor revolution

1310 rpm or more

2. All of the following conditions are met

-

ECM selected gear

Not 1st

Turbine speed sensor revolution

760 rpm or more
P077C and P077D:

Output speed sensor pulse input fail (P0722)

(Pending / MIL)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0722:

Output speed sensor signal

No signal
P077C:

Output speed

Below 0.2 V
P077D:

Output speed

Higher than 1.8 V

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs (See page Perform registration and/or initialization when parts related to the ).
  • Perform registration and/or initialization when parts related to the automatic transmission are replaced (See page ).

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Perform the D Position Shift Test in Road Test (See page Turn the ignition switch off. ).*1
  2. Turn the ignition switch off.
  3. Perform step (*1) again.
  4. Check for DTCs again (See page ).

1. DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

(a) Warm up the engine.

(b) Turn the ignition switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Data List.

(g) According to the display on the Techstream, read the Data List.

Engine and ECT

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

SPD (SP2)

Output shaft speed/

Min.: 0 km/h (0 mph)

Max.: 255 km/h (158 mph)

0 km/h (0 mph): Vehicle stopped (equal to vehicle speed)

-

HINT:

  • SPD (SP2) is always 0 while driving: Open or short in the sensor or circuit.
  • SPD (SP2) value displayed on the Techstream is much lower than the actual vehicle speed: Sensor trouble, improper installation, or intermittent connection trouble of the circuit.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (SPD (SP2) AND SP2 SENSOR VOLTAGE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List

(e) In accordance with the display on the Techstream, read the Data List.

Engine and ECT

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

SPD (SP2)

Output shaft speed/

Min.: 0 km/h (0 mph)

Max.: 255 km/h (158 mph)

0 km/h (0 mph): Vehicle stopped (equal to vehicle speed)

-

SP2 Sensor Voltage

Transmission revolution sensor (SP2) output voltage/

Min.: 0.000 V

Max.: 4.999 V

0.1 to 1.9 V: Engine idling

-
Result

Result

Proceed to

Data display is not within Normal Condition range

A

Data display is within Normal Condition range

B
B

REPLACE ECM

A

2.

INSPECT TRANSMISSION REVOLUTION SENSOR (SP2)

(a) Remove the transmission revolution sensor (SP2) (See page (b) Connect the battery to the sensor as shown in the illustration. ).

(b) Connect the battery to the sensor as shown in the illustration.

Text in Illustration

*1

Transmission Revolution Sensor (SP2)

*2

Ammeter

*3

Battery

*4

Magnet

*a

5 mm (0.197 in.) or less

-

-

(c) Wave a magnetic object left and right in front of the transmission revolution sensor (SP2) tip (5 mm (0.197 in.) or less) to change the high/low signals while measuring the current.

NOTICE:

Make sure to wave the magnetic object during the inspection. The current will not change without waving the magnetic object as indicated by the arrow in the illustration.

(d) Measure the current according to the value(s) in the table below.

Standard Current:

Tester Connection

Condition

Specified Condition

1 (SP2O) - 2 (SP2B)

Low signal

4 to 8 mA

1 (SP2O) - 2 (SP2B)

High signal

12 to 16 mA
NG

REPLACE TRANSMISSION REVOLUTION SENSOR (SP2)

OK

3.

CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (SP2) - ECM)

(a) Disconnect the T5 transmission revolution sensor (SP2) connector.

(b) Disconnect the E18 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T5-2 (SP2B) - E18-10 (SP2B)

Always

Below 1 Ω

T5-1 (SP2O) - E18-9 (SP2O)

Always

Below 1 Ω

T5-2 (SP2B) - Body ground

Always

10 kΩ or higher

T5-1 (SP2O) - Body ground

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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