Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN1991JETTA L4-1984CC 2.0L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSKNOCK SENSORSPECIFICATIONSELECTRICAL SPECIFICATIONS
1991 Volkswagen Jetta L4-1984cc 2.0L DOHC
Electrical Specifications
1991 Volkswagen Jetta L4-1984cc 2.0L DOHCSECTION Electrical Specifications
TEMPERATURE CHART - CTS
Intake Air Temperature Chart (EGR):
TEMPERATURE CHART - EGR
Air Flow Sensor Plate Potentiometer
Between terminals 1 and 2 > 4000 ohms
Between terminals 2 and 3 < 1000 ohms
Between terminals 2 and 3 (raise sensor plate) > 4000 ohms uniformly
Coolant Temperature Sensor
Between sensor terminals Refer to TEMPERATURE CHART - CTS
CIS-E Control Unit
Power supply to terminal 19 Battery Voltage
Power supply to terminal 14 Battery Voltage
Engine speed limit approx. 6800 RPM
Cold Start Valve
Between valve terminals approx. 10 ohms
Differential Pressure Regulator
Between terminals 1 and 2 15 - 25 ohms
Idle Stabilizer Valve
Between terminals on valve 4 - 12 ohms
Intake Air Temperature Sensor (EGR)
Between sensor terminals Refer to TEMPERATURE CHART - EGR
Knock Sensors
Between terminals 1 and 2 infinite ohms
Oxygen Sensor
Preheat Resistor Cold (less than 68 deg. F./20 deg. C.) 3 ohms
Preheat Resistor Hot (greater than 662 deg. F./350 deg. C.) 13 ohms
Output Voltage (with CO adjustment within specs) 0.3 - 0.7 volts
Tune-up Specifications
Air/Fuel Ratio 0.7%
Air/Fuel Ratio-Limits [1] 0.3 - 1.2%
Timing 6° +/- 1° BTDC
Idle RPM [2] 800 - 1000
[1] Check CO with the oxygen sensor connected.
[2] Not adjustable, with A/C off.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.