Signal Specification ECC
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Connector A; A1-30
All values listed below should be measured between the respective terminal in column 1 (Terminal ) and terminal A23 (ground) unless stated otherwise in column 4 (Other ).
The ECC control module connector # A1-30 corresponds to the breakout box terminals # 1-30.
NOTE:
The blower fan should be on, or the engine running at idle, in order for the control module to activate the damper motors when the selectors are turned.
NOTE:
It is important to check ground terminals before taking readings. Connect breakout box according to Connection of breakout box ECC
before readings are taken.
| U= | DC voltage in volts (V) | f= | Frequency in Hertz (Hz) |
| Ulow= | Voltage approx 0 V | %duty= | Duty cycle (pulse ratio) as a percentage (%) |
| Ubat= | Battery voltage | - | - |
| Terminal | Signal Type | Ignition On/Engine Idling | Other |
| A1 | - | - | - |
| A2 | - | - | - |
| A3 | Signal, request to air conditioning (A/C) compressor (to engine control module (ECM)). | A/C REQUEST: 1-2 V below Ubat. No request: U less than 1.5 V. |
- |
| A4 | - | - | - |
| A5 | Signal, activation power unit. | U= 11.3-13.3 V | - |
| A6 | - | - | - |
| A7 | Power supply, position sensor damper motors. | U= 4.8-5.2 V. | - |
| A8 | Control signal+, left temperature damper motor. | Motor's +winding activated: U=2-4 V below Ubat. Motor +winding not activated: U < 1 V. |
Motor activated when passenger compartment temperature selector turned to colder temperature selection. |
| A9 | Control signal-, left temperature damper motor. | Motor's -winding activated: U=2-4 V below Ubat. Motor +winding not activated: U < 1 V. |
Motor activated when passenger compartment temperature selector turned to higher temperature selection. |
| A10 | Control signal +, right temperature damper motor. | Motor's + winding activated: U=2-4 V below Ubat. Motor + winding not activated: U < 1 V. |
Motor activated when passenger compartment temperature selector turned. |
| A11 | Control signal -, right temperature damper motor. | Motor's - winding activated: U=2-4 V below Ubat. Motor + winding not activated: U < 1 V. |
Motor activated when passenger compartment temperature selector turned. |
| A12 | Signal, position sensor on left temperature damper motor. | U=0-5 V. | Voltage is varied when passenger compartment temperature selector is turned. |
| A13 | Signal, position sensor on right temperature damper motor. | U=0-5 V. | Voltage is varied when passenger compartment temperature selector is turned. |
| A14 | Diagnostic signal from power unit. | U=0.22-2.5 V. | Voltage increases with blower fan speed. |
| A15 | Signal, blower fan speed (to power unit). | f≈100 Hz. Increased duty cycle (+trigg) gives increased blower fan speed. |
Signal is a pulsed signal with fixed frequency and variable duty cycle. |
| A16 | Signal, panel lighting (from rheostat). | f ≈ 125 Hz. Increased duty cycle (+trigg) gives brighter lighting level. |
Signal is a pulsed signal with fixed frequency and variable duty cycle. |
| A17 | - | - | - |
| A18 | - | - | - |
| A19 | Signal, outside temperature sensor. | U= 0-5 V. 20°C ≈ 2.5 V |
Voltage decreases with rise in temperature. |
| A20 | Signal, engine block heater (from engine block heater timer). | Timer ON: Ubat Timer OFF: Ulow |
- |
| A21 | - | - | - |
| A22 | Signal ground sensor (measured against battery negative terminal). | Ulow | - |
| A23 | Power ground (measured against battery negative terminal). | Ulow | - |
| A24 | Control signal+, damper motor air distribution. | Motor's - winding activated: U=2-4 V below Ubat. Motor + winding not activated: U < 1 V. |
Motor activated when air distribution selector turned to different positions. If activated, depends on position and in which direction the selector is turned. |
| A25 | Control signal +, damper motor air distribution. | Motor's - winding activated: U = 2-4 V below Ubat. Motor + winding not activated: U < 1 V. |
Motor activated when air distribution selector turned to different positions. If activated, depends on position and in which direction the selector is turned. |
| A26 | Control signal +, damper motor recirculation. | Motor's + winding activated: U = 2-4 V below Ubat. Motor + winding not activated: U < 1 V. |
Motor activated when recirculation engaged. |
| A27 | Control signal -, damper motor recirculation. | Motor's + winding activated: U = 2-4 V below Ubat. Motor + winding not activated: U < 1 V. |
Motor activated when recirculation disengaged. |
| A28 | Signal, damper motor position sensor air distribution. | U = 0-5 V depending on sensor position. | Voltage reduces when the air distribution selector is turned from the DEF position to the VENT position clockwise. Note: In AUT position the control module itself modifies the position and so the value. |
| A29 | Signal, damper motor position sensor recirculation. | U = 0-5 V. | Voltage increases when recirculation is engaged. |
| A30 | Diagnostic lead. | U = 0-4 V below Ubat. | Other values apply if the fault-tracing instrument is connected to the data link connector (DLC). |
Connector B; B1-10
All values listed below should be measured between the respective terminal in column 1 (Terminal ) and terminal A23 (ground) unless stated otherwise in column 4 (Other ).
The ECC control module connector #B1-10 corresponds to the breakout box terminals #47-56.
NOTE:
It is important to check ground terminals before taking readings. Connect breakout box according to Connection of breakout box ECC
before readings are taken.
| U= | DC voltage in volts (V) | f= | Frequency in Hertz (Hz) |
| Ulow= | Voltage approx 0 V | - | - |
| Ubat= | Battery voltage | - | - |
| Terminal | Signal Type | Ignition On/Engine Idling | Other |
| B1 | Signal, vehicle speed (from combined instrument panel). | Frequency increases with increase in speed. | Pulsed signal with fixed duty cycle and variable frequency. |
| B2 | Signal, engine coolant temperature (ECT) (from engine control module (ECM)) | Cold engine (+20°C): f≈40 Hz. Engine at normal operating temperature (+90°C): f≈22 Hz. |
Pulsed signal with fixed duty cycle and variable frequency. |
| B3 | Signal, generator (GEN) D+. | Generator (GEN) charging: Ubat Generator (GEN) not charging ignition on: U≈0.5 V. |
- |
| B4 | - | - | - |
| B5 | Power supply, X supply (from ignition switch). | Ubat | - |
| B6 | Signal, passenger compartment temperature sensor | 20°C ≈ 2.5 V | Voltage decreases with rise in temperature. |
| B7 | - | - | - |
| B8 | Control signal fan motor passenger compartment temperature sensor. | Activated: U=0-2 V below Ubat. Not activated: U=Ulow. |
- |
| B9 | Signal, sun sensor. | Current signal | Increases with sun intensity. |
| B10 | Signal ground, sensor. | Ulow | - |