A/c-heater system - automatic 1995 volvo 850 1995-96 auto. A/c-heater systems volvo 850 * please read this first * warning: to avoid injury from accidental air bag deployment, read and carefully follow all service precautions and disabling & activating air bag system procedures in the air bag restra...
Fig. 1: identifying ecc control panel courtesy of volvo cars of north america. Operation a/c compressor clutch control the a/c compressor electromagnetic clutch is powered by the a/c relay. Compressor operation requires that the a/c relay be activated by both electronic climate control (ecc) module ...
Temperature control dial, and engine coolant temperature. At low outside temperatures, the ecc control module selects floor/defrost setting, with a slight amount of bi-level air if sunshine is present. If outside temperature is between 50-66 f (10- 19 c), a varying degree of bi-level air is selected...
Recirculated air mode the ecc control module selects recirculated air mode only for a combination of cooling and high outside temperature, provided that: * there is a considerable difference between the desired and actual temperature on driver’s side. The quantity of recirculated air will vary betwe...
Present each time ignition is turned on or engine started. Dtcs will remain stored until cleared by an input code. Note: test unit (981 3190) and adapter (981 3194) are required for dtc diagnosis. The volvo diagnostic key (998 8670) may be used to perform self-diagnostics. Follow tool manufacturer’s...
Code # condition/affected circuit 1-1-1 ..................... No fault found by diagnostic system 1-2-1 .......... Outside temp. Sensor circuit shorted to ground 1-2-2 .................................... Outside temp. Sensor circuit open or shorted to power 1-2-3 .... Driver’s side temp. Sensor cir...
4-1-8 .................... No control signal to ecc power stage 4-1-9 ....... Ecc power stage emitting faulty diagnostic signal 4-2-0 ................ Ecc control module fault, program memory 5-1-1 ......................... Self-adjustment of damper motor limit positions not carried out test mode 1 ...
(10 seconds on, 10 seconds off), switch a/c compressor on and off, and turn control panel a/c indicator on and off. If a/c relay does not respond as indicated, check a/c relay. See a/c relay check under testing. Self-adjustment of damper motor limit positions 1) turn ignition on. Place fan (blower m...
For codes. Fig. 3: using test unit to diagnose ecc system courtesy of volvo cars of north america..
Fig. 4: identifying outside temperature sensor terminals courtesy of volvo cars of north america. Fig. 5: locating outside temperature sensor courtesy of volvo cars of north america..
Dtc 1-2-2 outside temp. Sensor circuit open or shorted to power 1) ensure dtcs 1-2-2, 1-2-4, 1-2-6, 2-1-1, 2-2-1, 2-3-1, 2-3- 3 or 2-3-5 are not present at the same time. If any of these codes are present at the same time, check for an open circuit in the common ground wire. If only dtc 1-2-2 is pre...
Fig. 7: locating passenger’s side temperature sensor courtesy of volvo cars of north america. Dtc 1-2-4 & 1-2-6 driver’s or passenger’s side temp. Sensor circuit open or shorted to power 1) ensure dtcs 1-2-2, 1-2-4, 1-2-6, 2-1-1, 2-2-1, 2-3-1, 2-3- 3 or 2-3-5 are not present at the same time. If any...
Ground wire. If only dtc 1-2-4 or 1-2-6 is present, go to next step. 2) turn ignition off. Install test unit and adapter between ecc control module and wiring harness. Turn ignition on. Connect voltmeter to test unit pins no. 10 and 12 to check driver’s side temperature sensor and terminals no. 10 a...
Fig. 8: locating duct temperature sensor courtesy of volvo cars of north america..
Fig. 9: identifying duct temperature sensor terminals courtesy of volvo cars of north america. Dtc 1-3-2 & 1-3-4 driver’s or passenger’s side duct temp. Sensor circuit open or shorted to power 1) if dtc 1-3-2 and 1-3-4 are both present, check for open circuit in duct temperature sensor common ground...
4) if voltmeter indicates 5 volts, check duct temperature sensor wiring for an open circuit. Go to next step. If voltmeter indicates 12 volts, check wiring for short to voltage between connector terminal no. 2 (green or yellow wire) and ecc control module terminal c1 (driver’s side) or c2 (passenger...
1) run engine and check whether temperature gauge in instrument cluster works. If temperature gauge works, engine temperature signal is reaching instrument panel, but green/gray wire between ecc control module terminal a23 and instrument cluster has an open circuit. See fig. 10. 2) if temperature ga...
Side damper motor), no. 20 (ventilation damper motor), no. 19 (floor/defrost damper motor), or no. 21 (recirculation damper motor). 4) if voltmeter indicates 12 volts, check wiring and ecc control unit terminals for a short to voltage. See pin voltage tests under testing. If voltmeter indicates 5 vo...
Fig. 12: identifying a/c relay connector terminals courtesy of volvo cars of north america..
Fig. 13: removing damper motor courtesy of volvo cars of north america. Dtc 2-1-2, 2-2-2, 2-3-2, 2-3-4 & 2-3-6 driver’s or passenger’s side damper motor position sensor.
Shorted to ground 1) check if dtcs 2-1-2, 2-2-2, 2-3-2, 2-3-4, and 2-3-6 are all present together. If all dtcs are not present, there is a short circuit in ground wire between ecc control unit and damper motor which applies to dtc. See automatic a/c-heater system diagnostic trouble codes table, then...
1) check if dtcs 3-2-1, 3-2-2, 3-2-3, 3-2-4, and 3-2-5 are also present. If all dtcs are present, vehicle may be equipped with an ecc control module for a right-hand-drive vehicle, or vice versa. Check ecc terminal a28. See fig. 10. Ecc control module for left-hand- drive vehicles should not have te...
Connector. Disconnect passenger compartment temperature sensor connector. Connect jumper wire between temperature sensor connector terminals no. 2 and 4. 3) connect an ohmmeter between test unit pins no. 6 and 45 (driver’s side), and between test unit pins no. 6 and 46 (passenger’s side). If ohmmete...
Fig. 15: locating power stage & a/c relay courtesy of volvo cars of north america. Dtc 4-1-9 ecc power stage emitting faulty diagnostic signal.
1) ensure ignition is off. Connect test unit to ecc control module. Check ground circuits. See dtc 1-2-1, outside temp. Sensor circuit shorted to ground. If ground circuits are okay, go to next step. 2) turn ignition on. Connect voltmeter between test unit pins no. 6 and 27. Voltmeter should indicat...
Speed. 4) close engine hood, doors and windows. Run engine at 1500- 1600 rpm. Place thermometer in one of the center panel vents. Allow system to stabilize for at least 8 minutes. Check temperature in center panel vent. See a/c system performance specifications table. A/c system performance specific...
2 digital timer (parking heater) 12 volts (on); 0 volts (off) 3 rheostat 12 volts (on); 0 volts (off) 5 power supply to power stage battery voltage 6 power ground 0 volts 8 damper motor position sensors 5 volts 9 signal ground 0 volts 10 signal ground 0 volts 12 driver’s side temp. Sensor about 2.5 ...
30 signal to/from diagnostic unit battery voltage (1) - pin assignments not listed are not used. Ecc control module pin assignments connector "b" (1) function/description voltage value pin no. 31 driver’s side damper about 0.4 volts (off), zero volts motor positive or battery voltage (on with contro...
(1) - pin assignments not listed are not used. Ecc control module pin assignments connector "c" (1) function/description voltage value pin no. 47 driver’s side duct temp. About 2.5 volts at room sensor signal temperature 48 passenger’s side duct temp. About 2.5 volts at room sensor signal temperatur...
1) raise and support front of vehicle. Perform test mode 2 under trouble shooting. Ecc control module should respond to vehicle speed signal with code 1-1-3. Ecc control module will continue to flash code even once test mode 2 is activated. If code 1-1-3 does not appear, turn ignition off. Cover sol...
Fig. 17: identifying evaporator & heater core connections courtesy of volvo cars of north america. Compressor removal & installation 1) disconnect negative battery cable. Discharge a/c system, using approved refrigerant recovery/recycling equipment. Remove air intake hose and hose connection to fan ...
Fig. 18: removing cooling fan components courtesy of volvo cars of north america. Condenser note: when replacing condenser, always replace "o" rings and snap-on connections. Removal & installation 1) disconnect negative battery cable. Discharge a/c system, using approved refrigerant recovery/recycli...
Fig. 19: removing damper motor courtesy of volvo cars of north america. Dashboard note: dashboard consists of 5 main sections: upper frame, lower frame (left and right), defroster duct and dashboard cover. Except for dashboard cover, all the main sections are glued together and cannot be separated. ...
Radio. Reach underneath ecc control module, and push up on locking button to release ecc control module. Remove ecc control module from dashboard. Remove cigarette lighter connector. Lift off dashboard. To install, reverse removal procedure. Dashboard cover note: when adjusting air-mix damper, only ...
Removal & installation 1) clamp off hoses to heater core in engine compartment at firewall. Remove center console kick panels. Remove underdash trim panels. Remove radio amplifier bracket. 2) remove drain hose. See fig. 21. Remove heater core case screws. Disconnect heater hose pipes. Remove heater ...
Hose connector to fan cover. Remove fan cover. Disconnect relays and wires from fan cover. Remove 4 screws from fan cover and remove relay casing and spacers. Disconnect 2-pin connector from fan relay and connector from fan motor. Remove fan cover. See fig. 18. 3) shield radiator. Disconnect suction...
Fig. 22: wiring diagram (850 2.3l turbo - 1 of 2).
Fig. 23: wiring diagram (850 2.3l turbo - 2 of 2).
Fig. 24: wiring diagram (850 2.4l - 1 of 2).
Fig. 25: wiring diagram (850 2.4l - 2 of 2).
