Operation CHARM: Car repair manuals for everyone.

System Specifications

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

Air Fuel Mixture
CO content 1 - 7% [2]

Air Induction Valve Solenoid (2WD ONLY)
Operating voltage 12 vdc
Resistance value 40 ohms

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 1600 +550 to -250 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)