DTC C2151/51: Front Initiator Circuit (Open); DTC C2152/52: Rear Initiator Circuit (Open) [08/2013 - ]: Procedure

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. When DTC C2151/51 is output:
   1. Disconnect the A56 front tire pressure monitor initiator connector.
3. When DTC C2152/52 is output:
   1. Disconnect the P23 rear tire pressure monitor initiator connector.
4. Using an oscilloscope, check waveform.

   Waveform

   Item	Contents
   Terminal	A56-1 (F IN) - A56-2 (F OT) P23-1 (R IN) - P23-2 (R OT)
   Tool setting	1 V/DIV, 100 μs./DIV.
   Vehicle condition	Power switch on (IG)

   OK

   Voltage alternates between high and low voltage.

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Front Tire Pressure Monitor Initiator)
   *b	Front view of wire harness connector (to Rear Tire Pressure Monitor Initiator)
   *c	Example
   *d	GND

   Result

   Result	Proceed to
   NG	A
   OK (when DTC C2151/51 is output)	B
   OK (when DTC C2152/52 is output)	C

B → See step   3 

C → See step   4 

A: Go to next step 

1. Turn the power switch off.
2. When DTC C2151/51 is output:
   1. Disconnect the A56 front tire pressure monitor initiator connector.
3. When DTC C2152/52 is output:
   1. Disconnect the P23 rear tire pressure monitor initiator connector.
4. Disconnect the H79 tire pressure monitor initiator driver connector.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   WHEN DTC C2151/51 IS OUTPUT:
   
   

   Tester Connection	Condition	Specified Condition
   A56-1 (F IN) - H79-1 (FR+)	Always	Below 1 Ω
   A56-1 (F IN) - Body ground	Always	10 kΩ or higher
   A56-2 (F OT) - H79-2 (FR-)	Always	Below 1 Ω
   A56-2 (F OT) - Body ground	Always	10 kΩ or higher

   WHEN DTC C2152/52 IS OUTPUT:
   
   

   Tester Connection	Condition	Specified Condition
   P23-1 (R IN) - H79-3 (RR+)	Always	Below 1 Ω
   P23-1 (R IN) - Body ground	Always	10 kΩ or higher
   P23-2 (R OT) - H79-4 (RR-)	Always	Below 1 Ω
   P23-2 (R OT) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5