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 MANUALSPLYMOUTH1991LASER L4-1997CC 2.0L DOHCREPAIR AND DIAGNOSISSPECIFICATIONSELECTRICAL SPECIFICATIONSCOMPUTERS AND CONTROL SYSTEMS
1991 Plymouth Laser L4-1997cc 2.0L DOHC
Computers and Control Systems
1991 Plymouth Laser L4-1997cc 2.0L DOHCSECTION Computers and Control Systems
IGNITION TIMING
Basic
Ignition Timing Connector grounded 5~ +/-2~ BTDC @ Curb Idle
Actual
Ignition Timing Connector ungrounded 8~ BTDC @ Curb Idle
The ECU may further advance the actual ignition timing at high altitudes.
RESISTANCE VALUES
Coolant Temperature Sensor
32 ~F (0~C) 5.9K ohms
68 ~F (20~C) 2.5K ohms
176 ~F (80~C) 0.3K ohms
EGR Control Solenoid Valve 36-44 ohms
EGR Temperature Sensor
At 50~C (122~F) 60-83K ohms
At 100~C (212~F) 11-14K ohms
Fuel Injector Coils
Turbo 2-3 ohms @ 68 ~F
Non-turbo 13-16 ohms @ 68 ~F
Fuel Pressure Control Valve Solenoid 36-46 ohms
Idle Speed Control Servo 28-33 ohms
Intake-Air Temperature Sensor
32 ~F (0~C) 6.0K ohms
68 ~F (20~C) 2.7K ohms
176 ~F (80~C) 0.4K ohms
Oxygen Sensor
Below 20~C (68~F) Approx. 15 ohms
Above 400~C (752~F) 30 ohms or more
Purge Control Solenoid Valve 36-44 ohms
Throttle Position Sensor 3.5-6.5K ohms
OUTPUT VOLTAGE
Oxygen Sensor (Lean - Rich) 0.1 - 0.9 Volts
Throttle Position Sensor Regulating Voltage 0.48-0.52 Volts at Curb Idle
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.