Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Rear Differential Lock Solenoid Circuit Low (P17C0)

DESCRIPTION

This DTC is output when a malfunction is detected due to a short to ground occurring in the differential lock coil drive circuit of the rear differential.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P17C0

Rear Differential Lock Solenoid Circuit Low

  • Diagnosis Condition: Directly after ignition switch is turned to ON, or when rear differential is switched between free and locked (differential lock coil operating) with ignition switch turned to ON
  • Malfunction Status: Short to ground in differential lock coil drive circuit
  • Malfunction Time: 0.05 seconds or more
  • Other: 1 trip detection logic
  • Wire harness and connector
  • 4 wheel drive control ECU
  • Differential lock coil

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

CHECK DIFFERENTIAL LOCK COIL

(a) Disconnect the 4 wheel drive control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F12-1 (SL+) or F12-5 (SL-) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to 4 Wheel Drive Control ECU)

OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

NG

2.

CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - DIFFERENTIAL LOCK COIL)

(a) Disconnect the F12 4 wheel drive control ECU connector.

(b) Disconnect the D28 differential lock coil connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F12-1 (SL+) or D28-2 (SL+) - Body ground

Always

10 kΩ or higher

F12-5 (SL-) or D28-1 (SL-) - Body ground

Always

10 kΩ or higher

OK

REPLACE DIFFERENTIAL LOCK COIL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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Other materials:

Road Test
ROAD TEST 1. PROBLEM SYMPTOM CONFIRMATION (a) Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that the transmission does not shift up or down, or that the shift point is too high or too low, conduct the following road test referring to t ...

Inspection
INSPECTION PROCEDURE 1. INSPECT FUEL DELIVERY PIPE SUB-ASSEMBLY LH (FUEL PRESSURE SENSOR) NOTICE: Do not remove the fuel pressure sensor from the fuel delivery pipe sub-assembly LH. If a fuel pressure sensor is removed, replace the fuel delivery pipe sub-assembly LH with a ne ...

Lock Switch Circuit
WIRING DIAGRAM PROCEDURE 1. CHECK REAR DIFFERENTIAL LOCK INDICATOR LIGHT (a) Turn the ignition switch to ON. (b) for 4WD: Finish switching to L4. (c) Check the rear differential lock indicator light. (d) Press the differential lock switch. (e) After 60 secon ...

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