Toyota Tacoma manuals

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

FAIL-SAFE CHART

1. FAIL-SAFE OPERATION AND DEACTIVATION CONDITION

DIFFERENTIAL SYSTEM (w/ Differential Lock)

DTC No.

Fail-safe Operation

Fail-safe Deactivation Condition

U0122

All switching prohibited

When rear differential is locked, rear differential switches to free

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

U0416

for 4WD:

Switching from 2WD to H4 and rear differential free to locked prohibited When rear differential is locked, rear differential switches to free

for 2WD:

Switching from rear differential free to locked prohibited

When rear differential is locked, rear differential switches to free

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

P163B

for 4WD:

Switching from 2WD to H4 and rear differential free to locked prohibited When rear differential is locked, rear differential switches to free

for 2WD:

Switching from rear differential free to locked prohibited

When rear differential is locked, rear differential switches to free

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

P17BB

Switching from rear differential free to locked prohibited

When rear differential is locked, rear differential switches to free

Differential lock indicator switch signal returns to normal and ignition switch is turned from off to ON

P17BC

Switching from rear differential free to locked prohibited

When rear differential is locked, rear differential switches to free

Differential lock indicator switch signal returns to normal and ignition switch is turned from off to ON

P17C0

Switching from rear differential free to locked prohibited

When rear differential is locked, rear differential switches to free

Differential lock coil drive circuit of rear differential recovers from ground short and ignition switch is turned from off to ON

P17C1

Switching from rear differential free to locked prohibited

When rear differential is locked, rear differential switches to free

Differential lock coil drive circuit of rear differential recovers from battery short and ignition switch is turned from off to ON

P17CC

Switching from rear differential free to locked prohibited

When rear differential is locked, rear differential switches to free

Differential lock switch signal returns to normal and ignition switch is turned from off to ON

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (a) Check the DTCs. (1) Turn the ignition switch off. (2) Connect the Techstream to the DLC3. (3) Turn the ignition switch to ON. (4) Turn the Techstream on. (5) ...

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:

Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129)
DESCRIPTION These DTCs are stored when a communication malfunction occurs between ECUs that perform pre-collision system control. DTC No. Detection Item DTC Detection Condition Trouble Area U0100 Lost Communication with ECM ...

Pump Motor Relay (C1253)
DESCRIPTION The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU (master cylinder solenoid). DTC No. DTC Detecting Condition Trouble Areas C1253 ...

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT FRONT SEAT AIRBAG ASSEMBLY LH (for Vehicle not Involved in Collision) (a) Perform a diagnostic system check (See page ). (b) With the front seat airbag assembly LH installed on the vehicle, perfor ...

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