INTRODUCTION
Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems.
Note. Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
| Component | Ohms |
|---|
| Crankshaft Position (CKP) Sensor | 1235-1365 |
| EVAP Purge Control Valve | 20-40 |
| Fuel Injector (GEMS) | 15.7-16.7 |
| Fuel Injector (BOSCH) | 13.8-15.2 |
| HO2S Heater | 5.7 |
| IAC Stepper Motor Coil | 51-55 |
| Ignition Coil (GEMS) |
| Primary Coil | 0.8 |
| Secondary Coil | 13,000 |
| Ignition Coil (BOSCH) |
| Primary Coil | 0.45-0.55 |
| Secondary Coil | 12,000-14,600 |
| Throttle Position Sensor | 3200-4800 |
COMPONENT RESISTANCE VALUES @ 68°F (20°C)
| Temperature °F (°C) | (1) Ohms | (1) Output Voltage |
|---|
| 22 (-30) | 28,000 | 4.70 |
| 14 (-10) | 9000 | 4.20 |
| 68 (20) | 2500 | 2.70 |
| 104 (40) | 1050 | 2.00 |
| 140 (60) | 600 | 1.20 |
| 176 (80) | 330 | 0.75 |
| 266 (130) | 90 | 0.25 |
| (1) Values are approximate. |
| (1) | Values are approximate. |
ENGINE COOLANT TEMPERATURE SENSOR OUTPUT VALUES (GEMS)
Scheme 1
| Temperature °F (°C) | (1) Ohms |
|---|
| 22 (-30) | 23,000-32,000 |
| 14 (-10) | 8400-10,200 |
| 68 (20) | 2350-2650 |
| 104 (40) | 1000-1300 |
| 140 (60) | 520-670 |
| 176 (80) | 290-365 |
| (1) Resistance values are approximate. |
| (1) | Resistance values are approximate. |
ENGINE FUEL TEMPERATURE SENSOR RESISTANCE (GEMS)
| Fuel Gauge Reading | Approximate Fuel Tank Volume Gals. (L) | Sender Unit Resistance Ohms |
|---|
| FULL | 25 (95) | (1) 15-19 |
| 3/4 | 18.8 (71) | 36 |
| 1/2 | 12.7 (48) | 64 |
| 1/4 | 6.4 (24) | 110 |
| RESERVE (Fuel Light ON) | 2.9 (11) | (2) 146-158 |
| EMPTY | Zero (0) | (3) 245-270 |
| (1) When the fuel gauge registers FULL the sender unit resistance should be approximately 15-19 ohms and the output voltage should be approximately one volt. (2) Low fuel indicator light will illuminate when the sender unit resistance is more than 175 ohms and the output voltage is approximately 2.77 volts. Low fuel indicator light will go out when sender unit resistance is less than 117 ohms and the output voltage is approximately 2.40 volts. (3) When the fuel gauge resisters EMPTY the sender unit resistance should be approximately 245-270 ohms and the output voltage should approximately 3.16 volts. |
| (1) | When the fuel gauge registers FULL the sender unit resistance should be approximately 15-19 ohms and the output voltage should be approximately one volt. |
| (2) | Low fuel indicator light will illuminate when the sender unit resistance is more than 175 ohms and the output voltage is approximately 2.77 volts. Low fuel indicator light will go out when sender unit resistance is less than 117 ohms and the output voltage is approximately 2.40 volts. |
| (3) | When the fuel gauge resisters EMPTY the sender unit resistance should be approximately 245-270 ohms and the output voltage should approximately 3.16 volts. |
FUEL TANK SENDING UNIT RESISTANCE (BOSCH)
| Condition | (1) Volts |
|---|
| Primary HO2S |
| Lean | 4.7 |
| Rich | 0.2 |
| Secondary HO2S |
| Lean | 0.9 |
| Rich | 0.1 |
| (1) Voltage should pulse between values. Voltage values are approximate. |
| (1) | Voltage should pulse between values. Voltage values are approximate. |
HEATED OXYGEN SENSOR (HO2S) OUTPUT VOLTAGE (GEMS)
| Condition | Volts |
|---|
| Primary HO2S | (1) 100-900 mV |
| Secondary HO2S | (2) 200-650 mV |
| (1) Voltage should switch from high to low and back at approximately 0.5 Hz. (2) Voltage should be static or change high to low and back slowly. |
| (1) | Voltage should switch from high to low and back at approximately 0.5 Hz. |
| (2) | Voltage should be static or change high to low and back slowly. |
HEATED OXYGEN SENSOR (HO2S) OUTPUT VOLTAGE (BOSCH)
| Measured Between Terminals No. | (1) Ohms |
|---|
| 3 & 4 | 5.7 |
| (1) At 68°F (20°C). |
HEATED OXYGEN SENSOR (HO2S) HEATER RESISTANCE (GEMS)
| Temperature °F (°C) | (1) Ohms |
|---|
| 22 (-30) | 23,000-32,000 |
| 14 (-10) | 8400-10,200 |
| 68 (20) | 2350-2650 |
| 104 (40) | 1000-1300 |
| 140 (60) | 520-670 |
| 176 (80) | 290-365 |
| (1) Resistance values are approximate. |
| (1) | Resistance values are approximate. |
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE (GEMS)
Scheme 2
| Airflow | Output Voltage |
|---|
| Minimum | Zero |
| 0.3 lbs/min (0.1 kg/min) | 0.8 |
| 0.4 lbs/min (0.2 kg/min) | 1.0 |
| 0.5 lbs/min (0.2 kg/min) | 1.1 |
| Engine @ Idle | 1.4 |
| 1.2 lbs/min (0.5 kg/min) | 1.6 |
| 2.1 lbs/min (1.0 kg/min) | 2.0 |
| 3.7 lbs/min (1.7 kg/min) | 2.4 |
| 6.0 lbs/min (2.7 kg/min) | 2.8 |
| 8.6 lbs/min (3.9 kg/min) | 3.1 |
| 11.9 lbs/min (5.4 kg/min) | 3.5 |
| 16.5 lbs/min (7.5 kg/min) | 3.9 |
| 22.5 lbs/min (10.2 kg/min) | 4.3 |
| 29.1 lbs/min (13.2 kg/min) | 4.7 |
| Maximum | 5.0 |
MASS AIRFLOW (MAF) SENSOR OUTPUT VOLTAGE (GEMS)
Scheme 3
| Position | Volts |
|---|
| Closed Throttle | Less Than 0.5 |
| Idle | Approximately 0.6 |
| Wide Open Throttle (WOT) | More Than 4.5 |
THROTTLE POSITION (TP) SENSOR VOLTAGE (GEMS)
