Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • The Matrix Chart is divided into 2 chapters. When troubleshooting, check Chapter 1 first. If instructions are given in Chapter 1 to proceed to 2, proceed as instructed.
  • If the instruction "Proceed to Next Suspected Area Shown in Problem Symptoms Table" is given in the flowchart for each circuit, proceed to the next suspected area in the table.
  • If the problem still occurs even though there are no malfunctions in any of the circuits, check the ECM and replace it if necessary.
  • *: When the circuit is defective, a DTC may be output.
1. Chapter 1: Electronic Circuit Matrix Chart

Symptom

Suspected Area

See page

No up-shift (1st to 2nd)

Shift solenoid valve SL3 circuit*

ECM

No up-shift (2nd to 3rd)

Shift solenoid valve SL4 circuit*

ECM

No up-shift (3rd to 4th)

Shift solenoid valve SL2 circuit*

Engine coolant temperature sensor circuit*

ECM

No up-shift (4th to 5th)

Shift solenoid valve SL1 circuit*

Shift solenoid valve SL4 circuit*

Engine coolant temperature sensor circuit*

ECM

No up-shift (5th to 6th)

Shift solenoid valve SL3 circuit*

Shift solenoid valve SL4 circuit*

Engine coolant temperature sensor circuit*

ECM

No down-shift (6th to 5th)

Shift solenoid valve SL4 circuit*

ECM

No down-shift (5th to 4th)

Shift solenoid valve SL1 circuit*

ECM

No down-shift (4th to 3rd)

Shift solenoid valve SL2 circuit*

Shift solenoid valve SL4 circuit*

ECM

No down-shift (3rd to 2nd)

Shift solenoid valve SL3 circuit*

Shift solenoid valve SL4 circuit*

ECM

No down-shift (2nd to 1st)

Shift solenoid valve SL3 circuit*

ECM

No lock-up or no lock-up off

Shift solenoid valve SLU circuit*

Shift solenoid valve SL circuit*

Transmission revolution sensor (NT) circuit*

Transmission revolution sensor (SP2) circuit*

Engine coolant temperature sensor circuit*

Stop light switch circuit*

No. 1 ATF temperature sensor circuit*

ECM

Shift point too high or too low

Throttle position sensor circuit*

Shift solenoid valve SLT circuit*

Transmission revolution sensor (NT) circuit*

Transmission revolution sensor (SP2) circuit*

Park/neutral position switch circuit*

No. 1 ATF temperature sensor circuit*

Pattern select switch power mode circuit

ECM

No gear change by moving shift lever to "+" or "-" while in S

Transmission control switch circuit

ECM

Harsh engagement (N to D)

Shift solenoid valve SLT circuit*

ECM

Harsh engagement (Any driving position)

Throttle position sensor circuit*

Shift solenoid valve SL1 circuit*

Shift solenoid valve SL2 circuit*

Shift solenoid valve SL3 circuit*

Shift solenoid valve SL4 circuit*

Shift solenoid valve SLT circuit*

Shift solenoid valve SLU circuit*

Shift solenoid valve SL circuit*

ECM

Harsh engagement (Lock-up)

Shift solenoid valve SLU circuit*

Shift solenoid valve SL circuit*

Transmission revolution sensor (NT) circuit*

Transmission revolution sensor (SP2) circuit*

ECM

Poor acceleration

Shift solenoid valve SLT circuit*

No. 2 ATF temperature sensor circuit*

ECM

Shifting malfunction (Vehicle is stuck in 3rd or 5th gear)

ECM power source circuit

Changing gears takes time when up-shifting

Shift solenoid valve SL circuit*

No engine braking

ECM

No kick-down

ECM

Slip or shudder (5th to 6th and 6th to 5th)

Shift solenoid valve SL circuit*

ATF temperature warning indicator remains on

No. 2 ATF temperature sensor circuit*

Engine coolant temperature sensor circuit*

ECM

Lock-up in 3rd gear

No. 2 ATF temperature sensor circuit*

Engine coolant temperature sensor circuit*

ECM

Vehicle moves forward with shift lever in N

Park/neutral position switch circuit*

ECM

Engine stalls when starting off or stopping

Shift solenoid valve SLU circuit*

ECM

Shifting malfunction

Park/neutral position switch circuit*

Transmission control switch circuit

ECM

2. Chapter 2: On-Vehicle Repair and Off-Vehicle Repair

Symptom

Suspected Area

See page

Vehicle does not move when shift lever is in any forward position or reverse position

Transmission control cable

Manual valve

Parking lock pawl

Rear planetary gear unit

Torque converter assembly

Vehicle does not move with shift lever in R

Valve body assembly

No. 2 brake (B2)

No. 3 brake (B3)

Shift solenoid valve SL4*

No up-shift (1st to 2nd)

Valve body assembly

No. 1 brake (B1)

Shift solenoid valve SL3*

No up-shift (2nd to 3rd)

Valve body assembly

No. 3 brake (B3)

Shift solenoid valve SL4*

No up-shift (3rd to 4th)

Valve body assembly

No. 2 clutch (C2)

Shift solenoid valve SL2*

No up-shift (4th to 5th)

Valve body assembly

No. 3 brake (B3)

Shift solenoid valve SL4*

Shift solenoid valve SL1*

No up-shift (5th to 6th)

Valve body assembly

No. 1 brake (B1)

Shift solenoid valve SL3*

Shift solenoid valve SL4*

No down-shift (6th to 5th)

No. 3 brake (B3)

Shift solenoid valve SL4*

Valve body assembly

No down-shift (5th to 4th)

Shift solenoid valve SL1*

No. 1 clutch (C1)

Valve body assembly

No down-shift (4th to 3rd)

No. 3 brake (B3)

Shift solenoid valve SL4*

Shift solenoid valve SL2*

Valve body assembly

No down-shift (3rd to 2nd)

No. 1 brake (B1)

Shift solenoid valve SL3*

Shift solenoid valve SL4*

Valve body assembly

No down-shift (2nd to 1st)

Valve body assembly

Shift solenoid valve SL3*

No lock-up or No lock-up off

Valve body assembly

Torque converter assembly

Harsh engagement (N to D)

Valve body assembly

No. 3 one-way clutch (F3)

No. 1 clutch (C1)

Shift solenoid valve SL1*

Harsh engagement (Lock-up)

Valve body assembly

Torque converter assembly

Shift solenoid valve SLU*

Harsh engagement (N to R)

Valve body assembly

No. 2 brake (B2)

No. 3 brake (B3)

Shift solenoid valve SL4*

Harsh engagement (1st to 2nd to 3rd to 4th to 5th to 6th)

Valve body assembly

Shift solenoid valve SLT*

Harsh engagement (1st to 2nd)

Valve body assembly

No. 1 brake (B1)

Shift solenoid valve SL3*

Harsh engagement (2nd to 3rd)

Valve body assembly

No. 3 brake (B3)

Shift solenoid valve SL4*

Harsh engagement (3rd to 4th)

Valve body assembly

No. 2 clutch (C2)

Shift solenoid valve SL2*

Harsh engagement (4th to 5th)

Valve body assembly

No. 3 brake (B3)

Shift solenoid valve SL4*

Harsh engagement (5th to 6th)

Valve body assembly

No. 1 brake (B1)

Shift solenoid valve SL3*

Harsh engagement (6th to 5th)

Valve body assembly

No. 3 brake (B3)

Shift solenoid valve SL4*

Slip or shudder (forward and reverse, after warm-up)

Transmission control cable

Valve body assembly

Oil strainer

No. 1 brake (B1)

No. 2 brake (B2)

No. 3 brake (B3)

No. 3 one-way clutch (F3)

No. 1 clutch (C1)

No. 2 clutch (C2)

Torque converter assembly

Slip or shudder (particular position, just after engine starts)

Torque converter assembly

Slip or shudder (shift lever in R)

No. 2 brake (B2)

No. 3 brake (B3)

Slip or shudder (1st)

No. 3 one-way clutch (F3)

No. 1 clutch (C1)

Slip or shudder (2nd)

No. 1 brake (B1)

No. 1 clutch (C1)

Slip or shudder (3rd)

No. 3 brake (B3)

No. 1 clutch (C1)

Slip or shudder (4th)

No. 1 clutch (C1)

No. 2 clutch (C2)

Slip or shudder (5th)

No. 3 brake (B3)

No. 2 clutch (C2)

Slip or shudder (6th)

No. 1 brake (B1)

No. 2 clutch (C2)

No engine braking (1st to 4th, shift lever in S)

No. 1 clutch (C1)

No engine braking (1st)

Valve body assembly

No. 2 brake (B2)

No. 1 clutch (C1)

No kick-down

Valve body assembly

Shift point too high or too low

Valve body assembly

Poor acceleration (All positions)

Valve body assembly

Torque converter assembly

Poor acceleration (6th)

No. 1 brake (B1)

No. 2 clutch (C2)

Front planetary gear unit

Engine stalls when starting off or stopping

Valve body assembly

Torque converter assembly

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