T-SB-0172-13

November 22, 2013

ABS Brake Noise with DTC C1431
Service
Category

Brake

Section

Brake System

Market

USA

Applicability
YEAR(S)

MODEL(S)

2012 – 2013

Camry

ADDITIONAL INFORMATION

Introduction

Some 2012 – 2013 model year Camry vehicles may exhibit a condition where ABS brake actuator
pump motor noise is heard from the engine compartment with Brake, ABS and/or TRAC warning
lamp(s) illuminated and Diagnostic Trouble Code (DTC) C1431 stored. This condition may be caused
by a poor ground on the left fender side panel bracket after a collision repair. This may occur during
body shop repairs or other repairs where the left side fender bracket grounds were left loose, not
properly attached using the correct bolts, or improperly painted.
Required Tools & Equipment
REQUIRED EQUIPMENT

PART NUMBER

SUPPLIER

Techstream 2.0*
TIS Techstream

QTY

TS2UNIT
ADE

1

TSPKG1

Techstream Lite

TSLITEDLR01

* Essential SST.

NOTE
• Only ONE of the Techstream units listed above is required.
• Software version 8.30.023 or later is required.
• Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE) at
1-800-368-6787.

Warranty Information
OP CODE

DESCRIPTION

TIME

OFP

T1

T2

N/A

Not Applicable to Warranty

–

–

–

–

© 2013 Toyota Motor Sales, USA

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ABS Brake Noise with DTC C1431

Repair Procedure

1. Follow the Repair Manual procedure to diagnose DTC C1431.
Refer to the Technical Information System (TIS), applicable model and model year Repair
Manual:
• 2012 / 2013 Camry:
Brake – Brake Control/ Dynamic Control Systems – “Vehicle Stability Control System:
C1430, C1431; Brake Pedal Load Sensing Switch OFF Stuck Malfunction”
2. If the brake pedal load sensing switch is judged OK, check the resistance at connector A40 Pin 1
to body ground. Is the resistance always below 1 ohm?
• YES – Continue diagnosis using the Repair Manual.
• NO – Proceed to step 3.
3. With the battery connected, perform voltage drop test from the two left fender bracket ground
wire eyelet tabs to body ground (see Figure 1).
NOTE
For detailed information on performing the voltage drop test, please refer to the guide
“QT611A: Body Electrical Diagnosis” found on TIS, under Technical Training – QTG – Skill
Area: Electrical & A/C.

CAUTION
At NO time should the battery be connected when any ground attachments (A1, A2, or apron
mounting bolts) are loose.

A. Use a left front strut tower mounting bolt as a good body ground (see Figure 2).
Figure 1.

Figure 2.

© 2013 Toyota Motor Sales, USA

November 22, 2013

T-SB-0172-13

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ABS Brake Noise with DTC C1431

Repair Procedure (Continued)

B. To perform voltage drop test, connect the negative lead of the DVOM to the strut tower bolt,
and the positive lead to the ground wire eyelet tab.
NOTE
Poor contact at the ground at the left fender side panel bracket may be an
intermittent condition.

4. Is voltage drop from each ground location less than 0.2 volts?
• YES – Continue diagnosis using the applicable Repair Manual.
• NO – A voltage drop of 0.2 volts or more from either of the ground locations may indicate
poor continuity in the ground circuit. Proceed to step 5.
5. With the battery disconnected, remove the left hand fender bracket from the apron for inspection.
6. Inspect the grounds on the left hand fender bracket. Confirm the following:
• Ground bolts are “E” bolts (see Figures 3 and 5).
• Apron bolts should be “E” bolts if left hand fender bracket has been replaced (see Figures 3
and 5).
• The area around the bracket to apron mounting bolt holes (see Figure 4) is free of paint.
• The area around the apron mounting bolt holes do not show masking tape or painted
masking tape (see Figures 3 and 4).
Figure 3.

Figure 4.
1

1
2

1
1

Confirm Green Masking Tape Is Removed

2

Confirm “E” Bolts Are Installed

Masking Tape — REMOVE After Painting,
NO Paint in This Area

If ALL conditions above are met, continue with diagnosis using the applicable Repair Manual.

© 2013 Toyota Motor Sales, USA

November 22, 2013

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ABS Brake Noise with DTC C1431

Repair Procedure (Continued)

If ANY of the conditions above are NOT met, continue to step 7.
NOTICE
• Do NOT drive the vehicle or hook up the battery without proper "E" bolts in all 4 locations
at apron and both grounds. The fender bracket must have a good ground path to prevent
Engine Room Junction Block damage.
• Do NOT remove the fender bracket or grounds without first disconnecting the negative (–)
battery cable.
Figure 5.

NOTE
1

• It is important that the bracket to
apron mounting bolts/washers are
free of paint on the front portion of
the bracket.

2

• The new part number bracket comes
with instructions that should be
followed carefully when replacing.
• The new bracket also comes
with green tape around the apron
mounting bolts to protect it during
the painting phase (see Figures 3
and 4). This green masking tape
MUST be removed in order for the
bracket to be properly installed on
the vehicle.

1

Old Bolt: DO NOT USE or Reuse These Bolts

2

NEW “E” Bolt

• The new bracket includes new apron
“E” mounting bolts. It is important
that the new “E” bolts are used and
are torqued properly. See Figure 5
on how to identify new bolts.
Torque: Ground Bolts:
6.9 – 9.8 N*m (70 – 100 kgf*cm,
5.1 – 7.2 ft*lbf)
Torque: Bracket to Apron Bolts:
3.9 – 8.8 N*m (40 – 90 kgf*cm,
2.8 – 6.5 ft*lbf)

© 2013 Toyota Motor Sales, USA

November 22, 2013

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ABS Brake Noise with DTC C1431

Repair Procedure (Continued)

7. Is there masking tape or painted masking tape or paint around the apron bolt holes?
• NO — Replace the left hand fender bracket.
• YES — Remove the tape or paint and continue to step 8.
NOTE
Apply cavity wax to apron bolts and area surrounding washers once bracket is
completely installed.

8. Once areas are repaired and secured with new “E” bolts, replace the Engine Room Junction
Block Assembly.
9. Confirm there is no damage to the Engine Room Junction Block Assembly.
10. With the battery reconnected, perform another voltage drop test from both ground wire tabs to a
strut tower bolt and verify the voltage drop is less than 0.2 volts.
Is voltage drop less than 0.2 volts?
• YES – Continue to step 11.
• NO – Go back to step 6.
11. Perform another resistance check at connector A40 Pin 1 to body ground to confirm that
resistance is always below 1 ohm.

© 2013 Toyota Motor Sales, USA