Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSSCION2008XD AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 58 (AUTOMATIC TRANSAXLE (DIAGNOSTIC CODES (P0791-U0100) & CIRCUIT TESTS))AUTOMATIC TRANSAXLE SYSTEMCIRCUIT TESTSPARK / NEUTRAL POSITION SWITCH CIRCUIT (TO 12/2010)PROCEDURE

2008 Scion xD Automatic

Park / Neutral Position Switch Circuit (TO 12/2010): Procedure

2008 Scion xD AutomaticSECTION Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

Disconnect the park/neutral position switch connector.

Fig 1: Identifying B13 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

Standard resistance

Tester Connection	Shift Position	Specified Condition
1 - 3 and 4 - 9	P	Below 1 Ω
1 - 3 and 4 - 9	Except P	10 kΩ or higher
1 - 2	R	Below 1 Ω
1 - 2	Except R	10 kΩ or higher
1 - 8 and 4 - 9	N	Below 1 Ω
1 - 8 and 4 - 9	Except N	10 kΩ or higher
1 - 7	D, S, "+" and "-"	Below 1 Ω
1 - 7	Except D, S, "+" and "-"	10 kΩ or higher

NG → See step 5

OK: Go to next step

CHECK ECU TERMINAL VOLTAGE (STA TERMINAL)

Connect the transmission control switch connector of the shift lever assembly.

Fig 2: Identifying B53 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage according to the value(s) in the table below while cranking the engine.

Standard voltage

Tester Connection	Switch Condition	Specified Condition
B53-10 (STA) - Body ground	Ignition Switch on (IG)	9 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - ECM)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - TCM)

Disconnect the TCM connector.

Fig 3: TCM Connector Terminal Identification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Turn the ignition switch on (IG), and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.

Standard voltage

Tester Connection	Shift Position	Specified Condition
B53-15 (R) - Body ground	R	11 to 14 V ^*
B53-15 (R) - Body ground	Except R	Below 1 V
B53-16 (D) - Body ground	D	11 to 14 V
B53-16 (D) - Body ground	Except D	Below 1 V

HINT:

*: The voltage will drop slightly because the back up light is turned on.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - TCM)

OK → See step 4

REPLACE TCM. Refer to REMOVAL
REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to REMOVAL

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.