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Home >> Mercedes Benz >> 1998 >> C43 >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Manual A/C-Heater Systems - Ml 320, Ml 430 & Ml 55) >> System Tests >> Electrical Tests >> A/C Refrigerant Pressure Switch

A/C Refrigerant Pressure Switch

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Mercedes-Benz ML55, 2001 Mercedes-Benz ML430, 2001 Mercedes-Benz ML320, 2000 Mercedes-Benz ML55, and 2000 Mercedes-Benz ML430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect refrigerant pressure sensor connector. Turn ignition on. Connect voltmeter positive lead to pressure sensor harness connector terminal "B" (Pink wire) and negative lead to terminal "A" (Tan wire). Voltage should be 4.75-5.25 volts.
  2. If voltage is as specified, replace A/C refrigerant pressure sensor. If voltage is not as specified, check wiring harness between refrigerant pressure sensor and All Activity Module (AAM). See WIRING DIAGRAMS  . Repair as necessary. If circuits are okay, replace AAM and retest A/C system.
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