BAROMETRIC PRESSURE (BARO) SENSOR
See appropriate G - TESTS W/ CODES article in this section for testing information.
CAM POSITION (CMP) SENSOR
| Wire Colors | (1) Volts |
|---|
| Black & White | 0.1 (Minimum) |
| (1) Turn ignition on. Voltage should fluctuate with each engine revolution. |
| (1) | Turn ignition on. Voltage should fluctuate with each engine revolution. |
CAM POSITION (CMP) SENSOR VOLTAGE (LEGACY & SVX)
CRANKSHAFT POSITION (CKP) SENSOR
| Application | Wire Colors | Volts |
|---|
| Legacy | Black & White | 0.1 (Minimum) |
| SVX | Black & Yellow | 0.1 (Minimum) |
| (1) Turn ignition on. Voltage should fluctuate with each engine revolution. For testing information on other models, see appropriate G - TESTS W/ CODES article in this section. |
| (1) | Turn ignition on. Voltage should fluctuate with each engine revolution. For testing information on other models, see appropriate G - TESTS W/ CODES article in this section. |
CRANKSHAFT POSITION (CKP) SENSOR VOLTAGE (1)
EGR TEMPERATURE SENSOR (LOYALE & SVX)
For testing information, see appropriate G - TESTS W/ CODES article in this section.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
| Application | Temperature | Ohms |
|---|
| Impreza | 68°F (20°C) | 3000 |
| Impreza | 176°F (80°C) | 270 |
| Justy, Legacy & SVX | 68°F (20°C) | 2000-3000 |
| Justy, Legacy & SVX | 176°F (80°C) | 300-400 |
| Loyale | 14°F (-10°C) | 7000-11,500 |
| Loyale | 68°F (20°C) | 2000-3000 |
| Loyale | 122°F (50°C) | 700-1000 |
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE
KNOCK SENSOR (KS)
| Application | Ohms |
|---|
| All Models | 532,000-588,000 |
| (1) Measure resistance between ground and connector terminal. |
| (1) | Measure resistance between ground and connector terminal. |
KNOCK SENSOR (KS) RESISTANCE (1)
MASS AIRFLOW SENSOR
| Terminal | Specification |
|---|
| Red Wire & Ground | 1 Megohm (Min.) |
| White Wire & Ground | 1 Megohm (Min.) |
| Black Wire & Ground | 1 Megohm (Min.) |
| Black/Red Wire & Ground | Zero Ohms |
| (1) Measure resistance between specified terminal of airflow sensor connector and ground. |
| (1) | Measure resistance between specified terminal of airflow sensor connector and ground. |
MASS AIRFLOW SENSOR RESISTANCE (LEGACY) (1)
| Application | (1) Volts |
|---|
| Impreza | (2) |
| Justy | (3) |
| Legacy |
| ECU Pin No. 8 & Ground (4) |
| Engine Off | 0-13 |
| At Idle | 13-14 |
| ECU Pin No. 9 & Ground (4) |
| Engine Off | 0.0-0.3 |
| At Idle | 0.8-1.2 |
| ECU Pin No. 10 & Ground (4) |
| Engine Off | Zero |
| At Idle | Zero |
| Loyale: White Wire & Black Wire Terminals (4) | 0.1-0.5 |
| SVX | (2) |
| (1) Voltage should be greater when blowing air through inlet side of airflow meter. (2) Information is not available from manufacturer. See appropriate G - TESTS W/ CODES article in this section. (3) Justy is not equipped with airflow sensor. (4) Connect voltmeter between these 2 terminals of airflow sensor connector. |
| (1) | Voltage should be greater when blowing air through inlet side of airflow meter. |
| (2) | Information is not available from manufacturer. See appropriate G - TESTS W/ CODES article in this section. |
| (3) | Justy is not equipped with airflow sensor. |
| (4) | Connect voltmeter between these 2 terminals of airflow sensor connector. |
MASS AIRFLOW SENSOR VOLTAGE
OXYGEN (O2) SENSOR
| Application | Volts |
|---|
| Loyale (California) |
| Black/White Wire & Ground | 10 Or Less |
| White Wire & Ground | 0.05 Or More |
| All Others | (1) 0.1-0.9 |
| (1) With engine running, measure voltage between oxygen sensor connector terminal and ground. |
| (1) | With engine running, measure voltage between oxygen sensor connector terminal and ground. |
OXYGEN (O2) SENSOR VOLTAGE
THROTTLE POSITION (TP) SENSOR OR SWITCH
| Application (1) | (2) TP Connector Terminals | Ohms |
|---|
| Total Resistance |
| Legacy | Black Wire & Red Wire | 12,000 |
| Loyale | Black Wire & Red Wire | 3500-6500 |
| SVX | Black Wire & Red Wire | 5000 |
| Variable Resistance |
| Legacy |
| Throttle Closed | Black Wire & White Wire | 1000 |
| Throttle Open | Black Wire & White Wire | 4300 |
| Loyale |
| Throttle Closed | Black Wire & Green Wire | 1000 Or Less |
| Throttle Open | Black Wire & Red Wire | 2400 Or More |
| SVX |
| Throttle Closed | Black Wire & White Wire | 10,000-12,000 |
| Throttle Open | Black Wire & White Wire | 3000-5000 |
| (1) Justy is not equipped with TP sensor. (2) Unplug TP sensor connector. At component side of connector, connect ohmmeter between the indicated terminals. |
| (1) | Justy is not equipped with TP sensor. |
| (2) | Unplug TP sensor connector. At component side of connector, connect ohmmeter between the indicated terminals. |
THROTTLE POSITION (TP) SENSOR RESISTANCE
| Terminal | Volts |
|---|
| Throttle Closed |
| No. 15 (Brown Wire) | 4.4-5.5 |
| No. 4 (Light Green White) | 0.4-0.5 |
| No. 11 (Red/Green Wire) | Zero |
| Throttle Open |
| No. 15 (Brown Wire) | 4.4-5.5 |
| No. 4 (Light Green White) | 3.5-4.3 |
| No. 11 (Red/Green Wire) | Zero |
| (1) Backprobe between specified terminal of 22-pin ECM connector and ground. |
| (1) | Backprobe between specified terminal of 22-pin ECM connector and ground. |
THROTTLE POSITION (TP) SENSOR VOLTAGE (IMPREZA) (1)
| Application | (1) Terminals |
|---|
| Justy | (2) Blue/White Wire & Black/Red Wire |
| Legacy | Brown Wire & Black Wire |
| Loyale | Light Green Wire & Black Wire |
| (1) Unplug TP sensor connector. Check for continuity between specified terminals of connector. There should be continuity with throttle closed, and no continuity with throttle open. (2) In addition to idle switch function, throttle switch also incorporates wide open throttle switch function. To test wide open throttle switch function, check continuity between Green/Red wire and Black/Red wire terminals of throttle switch connector. There should be continuity with throttle fully open (at least 50 degrees), and no continuity with throttle closed. |
| (1) | Unplug TP sensor connector. Check for continuity between specified terminals of connector. There should be continuity with throttle closed, and no continuity with throttle open. |
| (2) | In addition to idle switch function, throttle switch also incorporates wide open throttle switch function. To test wide open throttle switch function, check continuity between Green/Red wire and Black/Red wire terminals of throttle switch connector. There should be continuity with throttle fully open (at least 50 degrees), and no continuity with throttle closed. |
THROTTLE SWITCH (IDLE SWITCH) CONTINUITY
TURBOCHARGER PRESSURE SENSOR
| ECU Connector (1) | Sensor Connector | Ohms |
|---|
| Pin No. 3 | White Wire | 0 |
| Pin No. 4 | Black Wire | 0 |
| Pin No. 5 | Red Wire | 0 |
| (1) Unplug ECU and pressure sensor connectors. Measure resistance between indicated pins and terminals of connectors. |
| (1) | Unplug ECU and pressure sensor connectors. Measure resistance between indicated pins and terminals of connectors. |
TURBOCHARGER PRESSURE SENSOR RESISTANCE (LEGACY)
| Terminals | Voltage |
|---|
| Sensor Connector |
| Red Wire & Black Wire | (2) 3.1 |
| Red Wire & Black Wire | (3) 2.6 |
| Red Wire & Black Wire | (4) 2.1 |
| (1) Apply 5 volts across terminals No. 1 (White wire) and No. 2 (Red wire), then connect terminal No. 1 to positive voltage and terminal No. 2 to negative voltage. Connect vacuum pump to pressure sensor hose fitting. Measure voltage across specified terminals when pressure is applied to sensor. (2) With 7.87 in. Hg pressure applied to sensor. (3) With no pressure or vacuum applied to sensor. (4) With 7.87 in. Hg vacuum applied to sensor. |
| (1) | Apply 5 volts across terminals No. 1 (White wire) and No. 2 (Red wire), then connect terminal No. 1 to positive voltage and terminal No. 2 to negative voltage. Connect vacuum pump to pressure sensor hose fitting. Measure voltage across specified terminals when pressure is applied to sensor. |
| (2) | With 7.87 in. Hg pressure applied to sensor. |
| (3) | With no pressure or vacuum applied to sensor. |
| (4) | With 7.87 in. Hg vacuum applied to sensor. |
TURBOCHARGER PRESSURE SENSOR VOLTAGE (LEGACY) (1)
VEHICLE SPEED SENSOR (VSS)
| Application | ECU Connector Pin No. | Wire Color |
|---|
| Impreza | 8 & 11 | (2) |
| Justy | 4 (22-Pin) | LT GRN/BLK |
| Legacy | 11 (12-Pin) | GRN/BLK |
| Loyale | 22 (24-Pin) | YEL/GRN |
| SVX | 11 (12-Pin) | YEL/RED |
| (1) Turn ignition on. Connect voltmeter between indicated terminal and ground. Slowly rotate drive wheels. Voltage should fluctuate between zero and about 5 volts (Legacy) or 2 volts (except Legacy). (2) Measure resistance between specified instrument cluster terminals while rotating speedometer drive. Resistance should fluctuate from less than 10 ohms to open circuit 4 times per revolution. |
| (1) | Turn ignition on. Connect voltmeter between indicated terminal and ground. Slowly rotate drive wheels. Voltage should fluctuate between zero and about 5 volts (Legacy) or 2 volts (except Legacy). |
| (2) | Measure resistance between specified instrument cluster terminals while rotating speedometer drive. Resistance should fluctuate from less than 10 ohms to open circuit 4 times per revolution. |
VEHICLE SPEED SENSOR (VSS) VOLTAGE (1)
