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.

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HOMESERVICE MANUALSVOLVO2009C70 AUTOMATICREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTGAUGES & INSTRUMENT PANELSELECTRONICS - DESIGN AND FUNCTION - 2 OF 4COMBUSTION PREHEATER MODULE (CPM) (2006-2013)SYSTEM OVERVIEWSIGNALS

2009 Volvo C70 Automatic

System Overview: Signals

2009 Volvo C70 AutomaticSECTION Signals

The table below summarizes the input signals to and output signals from the combustion preheater module (CPM). The illustration below (Fig 1) displays the same information with the Volvo component designations.

Input signals	Output signals
Directly connected:	Directly connected:
-	Water pump (only parking heater) (6/73) Fuel pump (FP) (6/35).
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Central electronic module (CEM) (4/56) Engine control module (ECM) (4/46) Steering wheel module (SWM) (3/254) Climate Control Module (CCM) (3/112) Accessory electronic module (AEM) (4/78). Phone module (PHM) (16/60) (option, from and incl. structure week 201020)	Driver information module (DIM) (5/1) Climate Control Module (CCM) (3/112) Central electronic module (CEM) (4/56) Accessory electronic module (AEM). Phone module

Fig 1: Identifying Combustion Preheater Module Components

Courtesy of VOLVO CARS CORPORATION

RENDER: 1.0x

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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.