Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Fail-safe Chart

FAIL-SAFE CHART

1. FAIL-SAFE OPERATION AND DEACTIVATION CONDITION

TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM

DTC No.

Fail-safe Operation

Fail-safe Deactivation Condition

U0100

Switching between H4 and L4 prohibited (shift position N*1 or neutral*2 signal interrupted)

CAN communication signal from ECM is received and ignition switch is turned from off to ON

U0122

All switching prohibited

When rear differential is set to lock, rear differential switches to free*3

CAN communication signal from skid control ECU is received and ignition switch is turned from off to ON

U0416

Switching from 2WD to H4 and rear differential free to lock*3 prohibited When rear differential is set to lock, rear differential switches to free*3

Wheel speed sensor malfunction signals from skid control ECU return to normal and ignition switch is turned from off to ON

P163B

All switching prohibited

When rear differential is set to lock, rear differential switches to free*3

4 wheel drive control ECU internal circuit returns to normal and ignition switch is turned from off to ON

P17A0

All switching prohibited

When rear differential is set to lock, rear differential switches to free*3

Recovers from open circuit in A.D.D. shift motor drive circuit and ignition switch is turned from off to ON

P17A4

Switching between 2WD and H4 prohibited

A.D.D. actuator limit switch and A.D.D. position switch (3 circuits) signals return to normal and ignition switch is turned from off to ON

P17A8

All switching prohibited

When rear differential is set to lock, rear differential switches to free*3

Recovers from open circuit in transfer shift motor drive circuit and ignition switch is turned from off to ON

P17A9

All switching prohibited

When rear differential is set to lock, rear differential switches to free*3

Recovers from short to ground in transfer shift motor and A.D.D. shift motor*3 drive circuits and ignition switch is turned from off to ON

P17AA

All switching prohibited

When rear differential is set to lock, rear differential switches to free*3

Recovers from short to B+ in transfer shift motor and A.D.D. shift motor*3 drive circuits and ignition switch is turned from off to ON

P17AC

All switching prohibited

When rear differential is set to lock, rear differential switches to free*3

Transfer shift actuator limit switch signal returns to normal and ignition switch is turned from off to ON

P17C7

-

Front differential oil temperature sensor enters normal range

P17C8

-

Front differential oil temperature sensor enters normal range

P2772

-

Normal signal from transfer shift actuator L4 detection switch input for 1 second and ignition switch is turned from off to ON

P279E

All switching prohibited

When rear differential is set to lock, rear differential switches to free*3

Normal signal from transfer position switch input for 1 second and ignition switch is turned from off to ON

  • *1: for Automatic Transmission
  • *2: for Manual Transmission
  • *3: w/ Differential Lock
Data List / Active Test
DATA LIST / ACTIVE TEST 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 ...

Freeze Frame Data
FREEZE FRAME DATA 1. FREEZE FRAME DATA (a) When a DTC is stored, the 4 wheel drive control ECU stores the current vehicle state as Freeze Frame Data. HINT: Freeze Frame Data at the time a DTC is ...

Other materials:

Tire Pressure Monitor ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Tire Pressure Monitor ECU Communication Stop Mode Either condition is met: Communication stop for "Tire Pressure2" is indicated on the "Communication Bus C ...

Does not Play even after Bluetooth Audio Mode is Selected
CAUTION / NOTICE / HINT HINT: Even if the portable player can play audio content, it may not be able to play via the in-vehicle device. This does not necessarily indicate a malfunction of the in-vehicle device. PROCEDURE 1. CHECK OPERATION (a) Check if the po ...

Front Radar Sensor Incorrect Axial Gap (C1A11,C1A14)
DESCRIPTION When the system determines that the vehicle is driving straight ahead based on signals from the yaw rate and acceleration sensor (airbag sensor assembly), etc., the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis is misaligned. C1A11 ...

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