DTC C2174/74: Vehicle Speed Signal Malfunction; DTC C2191/91: Vehicle Speed Signal Error (Test Mode DTC) [03/2014 - ]: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
6. Check that the values indicated on the Techstream and on the combination meter are the same.
   TIRE PRESSURE MONITOR
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Vehicle Speed	Vehicle speed reading/ min.: 0 km/h (0 mph) max.: 255 km/h (158 mph)	Actual vehicle speed	Speed indicated on the combination meter assembly

   OK

   Vehicle speed indicated on the Techstream indicates the actual speed.

NG → See step   3 

OK: Go to next step 

1. Perform a driving test.
2. Check for DTCs. Refer to DTC CHECK / CLEAR [03/2014 - ] .

   HINT: 

   The time required for DTC C2174/74 to be stored is 20 minutes.

   RESULT
   
   

   Result	Proceed to
   DTC C2174/74 is not output	A
   DTC C2174/74 is output	B

B → See step   4 

A → See step   8 

1. Disconnect the P46 tire pressure warning ECU and receiver connector.
2. Disconnect the F93 junction block connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P46-2 (SPD) - F93-87	Always	Below 1 Ω
   P46-2 (SPD) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Junction Connector)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10 

1. Replace the tire pressure warning ECU and receiver. Refer to REMOVAL [03/2014 - ] .

NEXT: Go to next step 

1. Perform registration. Refer to REGISTRATION [03/2014 - ] .

NEXT: Go to next step 

1. Perform initialization. Refer to INITIALIZATION [03/2014 - ] .

NEXT: Go to next step 

1. Perform a driving test.
2. Check for DTCs. Refer to DTC CHECK / CLEAR [03/2014 - ] .

   HINT: 

   The time required for DTC C2174/74 to be stored is 20 minutes.

   RESULT
   
   

   Result	Proceed to
   DTC C2174/74 is output	A
   DTC C2174/74 is not output	B

B → END 

A → See step   9