P0705 Transmission Range Sensor Circuit Malfunction - Automotive Repair Guides & Equipment

COMPONENT LOCATION

GENERAL DESCRIPTION

The PCM/TCM receives signals from the Inhibitor Switch based on the selected gear from driver input. When the vehicle is moving and the gear selected, the PCM/TCM controls the gear ratio for optimized transmission shift control.

DTC DESCRIPTION

When an undefined code is sent from the Inhibitor Switch to the PCM/TCM without specific transmission pattern, the PCM/TCM sets DTC P0705.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible Cause

DTC Strategy

Circuit Malfunction

Circuit short or open

Shift range signal error

PCM/TCM

Enable Conditions

Ignition “ON”

Battery voltage > 10V

Threshold value

TR switch unused code

Detecting Time

More than 4sec

Fail safe

Normal status : All position possible

Abnormal status : Above 3rd position possible

(3rd ~ 6th possible, 1st/2nd impossible)

SPECIFICATION

	P	P-R	R	R-N	N	N-D	D	D-X	X	X-Y	Y	Y-Z	Z
S1	1	0	0	0	1	1	1	1	1	1	0	0	0
S2	0	0	0	1	1	0	0	1	1	0	0	1	1
S3	1	1	0	0	0	0	0	0	1	1	1	1	1
S4	1	1	1	1	1	1	0	0	0	0	0	0	1

DIAGNOSTIC CIRCUIT DIAGRAM

SIGNAL WAVEFORM & DATA

MONITOR GDS DATA

1.	Connect scanner to Data Link Connector(DLC).

2.	Ignition “ON” & engine “OFF”.

3.	Selet “Currnet Data”mode and monitor “Inhibitor switch” parameter.

4.	Change a shift lever from P-range to D-range. Fig 1) P range Fig 2) R range Fig 3) N range Fig 4) D range

Is the Inhibitor switch value changed in specification?

	▶ Fault is intermittent caused by poor contact of PCM/TCM and DTC was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair as necessary.
	▶ Go to “Terminal and Connector Inspection” procedure.

TERMINAL & CONNECTOR INSPECTION

1.	Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.	Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary .
	▶ Go to “Power Circuit Inspection”.

POWER CIRCUIT INSPECTION

1.	Disconnect an Inhibitor switch.

2.	IG KEY “ON”” & Engine “OFF”.

Measure voltage between supplied power and ground at inhibitor circuit.

Approx. 12V

Is the measured voltage within specifications?

	▶ Go to “Signal Circuit Inspection” procedure.
	▶ Check that ECU fuse-10A is installed or opened. ▶ Check circuit open and replace as necessary .

SIGNAL CIRCUIT INSPECTION

1.	Connect an Inhibitor switch.

2.	Ignition “ON” & Engine “OFF”.

Measure voltages between each terminal and chassis ground during shift lever changed “P, R, N, D”.

See below “Inhibitor switch specification”

Inhibitor Switch Specification
NO	IGN SW	SELECT	SIGNAL
NO	IGN SW	SELECT	Inhibitor Switch 1 (S1)	Inhibitor Switch 2 (S2)	Inhibitor Switch 3 (S3)	Inhibitor Switch 4 (S4)
1	ON	P Range SW	12V	0V	12V	12V
2	ON	R Range SW	0V	0V	0V	12V
3	ON	N Range SW	12V	12V	0V	12V
4	ON	D Range SW	12V	0V	0V	0V

Is the measured voltage within specifications?

	▶ Substitute with a known-good Inhibitor switch and check for proper operation. If the problem is corrected, replace Inhibitor switch .
	▶ Check a battery short circuit, a ground short circuit at the wiring of Inhibitor switch and then go to “Verification of Vehicle Repair” procedure. ▶ If wiring of Inhibitor switch is normal then, Substitute with a known-good Inhibitor switch and check for proper operation. If the problem is corrected, replace Inhibitor switch

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