System Input

System input tests should be performed if no trouble codes are stored when performing SELF-DIAGNOSTICS .
System input tests cycle each cruise control switch and sensor. Use Scan Tester (MB991341) or an analog voltmeter for system input check.
The scan tester setting is the same as setting for self-diagnostics. Plug scan tester connectors into cigarette lighter and data link connector.
If using voltmeter, connect leads of analog voltmeter between cruise control terminal and ground terminal of diagnostic connector. SeeFigure . Turn ignition on. Turn cruise control switch to OFF position. Turn cruise control set switch to ON position.
Turn cruise control switch to ON position and within one second, turn resume switch to ON position. Perform each switch input test as specified in INPUT CODE CHART. SeeFig 1 .
Cycle each switch until code is displayed. If code is not displayed, that switch or sensor is defective. When each switch or sensor is cycled and signals are reaching control unit, codes will continue to display.
When switch or sensor cycling stops, code display stops. If system input tests check okay, check vacuum pump. See TEST No. 5 under CIRCUIT TESTS .

Fig 1: Input Code Chart

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Fig 2: Check Results Chart

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Fig 3: Symptom Chart (1 Of 2)

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Fig 4: Symptom Chart (2 Of 2)

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