Engine - Coolant Temperature Sensor/Switch

[1][2]A/C Relay
Resistance between terminals 1 and 2 continuity

Air Flow Meter
Output voltage between terminal D and ground 0 - 5.0 vdc [3]

Air Fuel Mixture
CO content at idle 0.2 - 5.0% [2]

Air Induction Valve Solenoid
Operating voltage 12 vdc
Resistance value 40 ohms

Blower Signal Relay
Resistance between terminals 1 and 2 continuity

EGR Solenoid
Operating voltage 12 vdc
Resistance value 40 ohms

EGR Temperature Sensor
Resistance value 85k ohms [6]

Fuel Injector
Resistance value 1.5 ohms [1]

Fuel Pump
Resistance between terminals A and C continuity

Fuel Pump Relay
Resistance between terminals 1 and 2 continuity

Idle Switch
Closes idle speed +250 ±150 rpm in neutral

Idle-Up Solenoid
Resistance between terminals 7 and 8 continuity

Ignition Coil
Primary Circuit
Resistance value 0.8 - 1.0 ohms [1]
Secondary Circuit
Resistance value 7.6k - 11.4k ohms [1]

Main Relay
Resistance between terminals 1 and 2 continuity

Mixture Heater
Resistance between terminals continuity

Mixture Heater Relay
Resistance between terminals 1 and 2 continuity

Safety Relay
Resistance between terminals 1 and 2 continuity

Throttle Sensor
Resistance value between terminals e & f variable [4]

Vehicle Speed Sensor
Resistance value alternates between open & closed [5]

Water Temperature Sensor
Resistance value at specified temperature
8.0 - 10k ohms -10° C (14° F)
2.1 - 2.9k ohms 20° C (68° F)
0.77 - 0.87k ohms 50° C (122° F)
0.3 - 0.33k ohms 80° C (176° F)


[1] Approximately
[2] With 2.5k ohm resistor in place of water temperature
sensor and with O2 sensor and throttle valve switch disconnected.
[3] Varies when racing engine.
[4] Varies smoothly when moving from closed to open throttle.
[5] Two times per revolution while turning sensor.
[6] At 100° C (212° F)