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.
Pinpoint Test 15: The Speed Control Indicator Is Never On
2009 Mazda B2300 L4-2.3LSECTION Pinpoint Test 15: The Speed Control Indicator Is Never On
PINPOINT TEST 15: THE SPEED CONTROL INDICATOR IS NEVER ON
Normal Operation
NOTE:The smart junction box (SJB) is also known as the generic electronic module (GEM).The instrument cluster receives the speed control status from the SJB/GEM over the high speed controller area network (HS-CAN) communication bus. When the speed control has been engaged, the SJB/GEM sends a message to the instrument cluster to illuminate the speed control indicator. The instrument cluster sets DTC U0100 in continuous memory if the speed control message is missing for more than 5 seconds and the instrument cluster turns off the speed control indicator.
This pinpoint test is intended to diagnose the following:
- PCM
- Instrument cluster
Step 1-Step 5:
Step 6:
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.