Visually inspect the isc valve if necessary.

Throttle body inspection and cleaning
Throttle valve synchronizationSpecifications
Service data
Electrical
unit: mm
Tightening torque specifications
Note
the specified tightening torque is described in the following.
“Starter motor components”
Reference: for the tightening torque of fastener not specified in this
section, refer to “tightening to ...
Front brake master cylinder assembly removal and installation
Removal
Drain brake fluid. Refer to “brake fluid replacement” .
Disconnect the front brake light switch coupler (1).
Place a rag underneath the brake hose union bolt (2)
on the master cylinder to catch any spilt brake fluid.
Remove the brake hose union bolt (2).
...
DTC “c31” (p0705): gp switch circuit
malfunction
Detected condition and possible cause
Detected condition
Possible cause
No gear position switch voltage
Gp switch voltage is not within the following range.
Gp switch voltage > 0.6 V
Gp switch circuit open or short.
Gp switch malfunction.
...