isuzu Workshop Repair Guides

Isuzu Workshop Service and Repair Manuals

Sensors and Switches - Fuel Delivery and Air Induction > < Diagram Information and Instructions|Page 245
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Vehicle Speed Sensor: Testing and Inspection

Vehicle Speed Sensor Circuit

FUNCTIONAL CHECK

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Connect ohm meter between ECM terminal "22" and ground.

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Disconnect speedometer cable from transmission.

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While turning cable slowly, circuit should indicate continuity and non-continuity alternately. 

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If faulty, check cable, circuit and speedometer. If above test is OK, check speedometer.

CABLE CHECK

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Remove instrument cluster.

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Turn cable at one end and confirm that other end turns.

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If faulty, replace cable. If OK, check circuit and speedometer.

Vehicle Speed Sensor Terminals (LS Model)

Vehicle Speed Sensor Terminals (Base Model)

SPEEDOMETER CHECK

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Disconnect negative battery cable.

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Remove instrument cluster.

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Connect an ohm meter to screws "1" and "2" at back of meter.

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Using a small screw driver, turn inner shaft of meter slowly.

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Meter should indicate continuity and non-continuity alternately. 

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If faulty, replace meter. If OK, vehicle speed sensor and circuit are functioning properly.

Sensors and Switches - Fuel Delivery and Air Induction > < Diagram Information and Instructions|Page 245