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NHTSA ID Number: 10118104

Manufacturer Communication Number: 167-T0705-12

TSB/Document Date: 2017-09-27


Summary

07 - 005 No Throttle Response (brake light switch)


Tech Tip No:
07 - 005
Group:
27 – Electrical System
Issue Date:
6-20-2007

CHASSIS TECH TIPS
Subject:
No Throttle Response (brake light switch)
1. RELEVANT MODELS:
All 2005 thru 2008 Conventional Models (with Allison Transmission)
2. COMPLAINT:
No throttle response.
3. CAUSE/CONDITION:
The ECM receives a brake light signal, which deactivates the accelerator
pedal.
This feature is to keep from stall testing the transmission torque convertor.
Several possibilities may cause this unwanted condition.
a) Defective stop lamp switch or switch out of adjustment. (at pedal)
b) Brake pedal not fully releasing.
c) Defective brake switch or wiring.
(at R14 valve – 2007 and 2008 air brake chassis)
4. CORRECTION:
Monitor brake switch and stop lamp switch status with Hino Diagnostic
Explorer. Verify that the switch status changes when applying and
releasing the brake pedal.

At R-14 Valve 2007 - 2008 MY

At Brake Pedal all model years

Page 1 of 4

Tech Tip No:
07 - 005
Group:
27 – Electrical System
Issue Date:
6-20-2007

CHASSIS TECH TIPS
Verify operation of stop lamp
switch.

Check adjustment of stop lamp
switch.

ADJUSTING THE STOP LAMP SWITCH
1) Twist stop light switch counter clockwise (to unlock). Position switch to
achieve proper clearance between tip of switch and buffer, now twist
switch clockwise (to lock).
2) After installing switch, depress the brake pedal several times, make sure
there is no contact between the switch and buffer.
3) Check the clearance
between stop lamp switch
and buffer.
"D": 0.5-1.5 mm
{0.0197-0.0590 in.}

Note: See photo’s on next page.

Page 2 of 4

Tech Tip No:
07 - 005
Group:
27 – Electrical System
Issue Date:
6-20-2007

CHASSIS TECH TIPS
Turn switch counter clockwise to unlock

Set switch to proper position

Set to .019 - .059

Turn switch clockwise to lock

Correct Setting

Incorrect Setting

Page 3 of 4

Tech Tip No:
07 - 005
Group:
27 – Electrical System
Issue Date:
6-20-2007

CHASSIS TECH TIPS

Inspect tension of brake pedal
return spring.

2007 – 2008 Air Brake Chassis
The brake light switch is located
on the R-14 relay valve mounted to
the crossmember near the rear axle.

Inspect the switch and wiring as
needed.

Poor brake pedal spring tension and stop lamp switch adjustments may cause
intermittent complaints especially on rough roads or while turning.
Page 4 of 4

1

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TSB/Document ID: 167-T0705-12

Replacement Service Bulletin Number:

MFR Communication Date: 2007-06-20

MFR Internal Campaign ID/Software Version:

Communication Type: Service Bulletin/Repair Instructions

NHTSA Components: EXTERIOR LIGHTING:BRAKE LIGHTS:SWITCH

MFR Component System:

MFR Component Subsystem:


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