740 L4-2320cc 2.3L SOHC Turbo VIN 87 B230FT (1986)
Connector configuration as illustrated.
CAUTION: The two types of air mass meters described in this Service Bulletin are not interchangeable.
Check ground(s)
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Connect an ohm-meter between terminal 36 and ground, and between terminal 6 and ground.
Meter should show less than 1 ohm resistance in both cases. Check wiring continuity if value is higher.
Check voltage supply
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Turn ignition ON.
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Connect a volt meter between terminal 9 and ground
Meter should show battery voltage. Check wiring and system relay if lower than battery voltage.
Check CO-adjustment screw
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Turn ignition ON.