300TE (124.090) L6-3.0L (103.983) (1989)
Vacuum Gauge/Economy Meter: Testing and Inspection
Testing economy driving gauge
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Disconnect vacuum line at distributor (arrow).
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Connect tester 201 589 13 21 00 to vacuum line at intake manifold.
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Start engine.
Specification at idling speed: -0.4 to -0.6 bar. If the specification is not achieved, the vacuum line is fouled or leaking; clean or replace as
necessary.
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Connect tester 201 589 13 21 00 between intake manifold and gauge.
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Gauge pointer moves to the left (1), specification at left stop: >= -0.585 bar.
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Increase idle speed until pointer of gauge is at start of red field (2).
Specification: approx. 0.4 bar.
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If specified value or reading on gauge not reached check for leak in vacuum system of headlamp range control and/or air conditioner.
Note: If a faulty vacuum unit at the transmission is found on vehicles with automatic transmission, oil may also be present in the gauge and in the
cable. Clean cable and replace gauge.
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Disconnect tester 201 589 13 21 00.
Special Tool
Function