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I have a 1999 Volvo C70. The car will only start after

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sitting for a significant period...
I have a 1999 Volvo C70. The car will only start after sitting for a significant period of time or when I have disconnected and then reconnected the battery resetting some censor. When the car doesn't start it will crank but not turn over due to lack of fuel pressure. After doing some checks it's not the fuel pump or fuel pump relay because the work fine right after disconnecting the battery cable. The battery is new so I'm sure it has to do with a censor that is shutting off the fuel pump. I think this has something to do with immobilizer on the Volvo but not sure. Thanks.
Submitted: 1 year ago.Category: Volvo
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Answered in 14 minutes by:
7/8/2016
Volvo Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Volvo
Satisfied Customers: 4,127
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicle
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Hi, I' m Chad. Welcome to JustAnswer. I' m reviewing your question now, and I will be post back with your reply ASAP

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Volvo Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago

definitely sound like you said a module resetting, most like the Anti Theft module ,or key not recognized, low rf signal from key, etc..

1-when it does not start , do you see a red led security light flashing on the dash or steady on .?

2-have you scanned and retrieved any fault codes , can you do that and post them back here for me ?

3-at the moment of failure , what are you losing , fuel or spark or both ?

4- does the car crank but does not start or dont crank at all?

5- what is the mileage on the vehicle

please let me know

Thank You
Chad Farhat
ASE Certified Technician

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Customer reply replied 1 year ago
I don't see a red security light flashing when I try and start the car. The car cranks but won't turn over and it seems to be fuel pressure and not spark. There's about 133,000 miles on the car. I don't have a computer to read the codes but I will try and check. Have you seen this before?
Customer reply replied 1 year ago
Is there a test I can perform to isolate if it's the anti theft module, ecu or siren module. On discussion boards I've seen that the Volvo often can have problems with the siren module battery going bad.
Volvo Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago

999 Volvo C70 L5-2.3L Turbo VIN 53 B5234T3

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Fuel pump (FP) relay
Frequency controlled mechanical relay

This the fuel pump relay swapped with another one like see if that make pump works

at the time of failure what are you missing fuel or spark or Both ?

1- Can you get a test light and check for spark ?

2-The fuel pump should prime for few seconds at the turn of the ignition switch from off to on , do you hear it running ?

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Volvo Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago

1999 Volvo C70 L5-2.3L Turbo VIN 53 B5234T3

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Fuse/Relay Identification and Location Fuses

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Fuses In Engine Compartment Relay/Fusebox

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Fuses - 11A/1-9

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Fuses - 11B/1-5

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Fuses In Central Electrical Unit

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Fuses - 11C/1-24

Relays in the relay / fusebox in the engine compartment 1 Main rela fuel injection system (2/32) 2 Glow plug relay (diesels) (2/14) (MSA) 3 Relay starter motor (2/35) 4 Air conditioning (A/C) relay (2/22) Relays in the central electrical unit 101-102 Control module cruise control (4/3) (FENIX) 103 Relay fuel pump (FP) (2/23) (Not MSA) 104, 108 Headlamp relay with bulb failure warning sensor (2/1) 105 Overload relay X-supply (2/30) 106 Overload relay 15I-supply (2/6) 107 Main relay compressed natural gas (CNG) powered (2/33) 201 Fog lamp relay (2/2) 202 Alarm horn relay (2/77) 203 Intermittent wiper relay (2/4) 204 Rear window intermittent wiper relay (2/16) (S70/V70) Audible acknowledgement signal soft-top (7/117) (CONV) 205 Rear hatch opening relay (2/67) (CONV) 206 Window lift mechanisms relay left-hand side (2/99) (CONV) Relay fuel shut-off system (2/129) (BIFUEL) 208 Switch heated rear window / door mirrors (2/44) 210 Window lift mechanisms relay right-hand side (2/100) (CONV) Relay start inhibitor (2/130) (BIFUEL) 212 Relay seat belt reminder / ignition warning (2/5) 214 Automatic fuses 11C/41-42 (CONV) Other relays 2/11 Engine cooling fan relay 2/43 Heated rear seat relay (S70/V70) 2/54 Coolbox relay (V70) 2/74 Heating plugs coolant relay (MSA) 7/1 Bulb failure warning sensor rear

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Check all the fuse ?

Check relay # ***** alarm horn relay

I sent you the diagram showing you location ?

please let me know

Thank You
Chad Farhat
ASE Certified Technician

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Volvo Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago

Location fuse/relay center

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Volvo Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago

hey how are you

did you get it fixed or you like more help please let me know ?

Chad (aka -Customer

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