TSB: 01-011/99

1995-98 Protege, 1996-97 Miata - A/C INOPERATIVE - P/S SWITCH TERMINAL ASSEMBLY CORRODED

APPLICABLE MODELS

1995-98 Protege with a BP or Z5 engine and VINs lower than JM1 BC14 W0182001.

1996-97 Miata with VINs lower than JM1 NA35 V0739029.

DESCRIPTION

Some vehicles may exhibit the air conditioning (A/C) system inoperative with the Malfunction Indicator lamp (MIL) ON. This may be due to the Power Steering Pressure (PSP) switch terminal assembly becoming corroded causing the Powertrain Control Module (PCM) to open the A/C relay circuit and set Diagnostic Trouble Code (DTC) P0550. A modified PSP switch terminal assembly is available to resolve this concern.

Customers having this concern should have their vehicle repaired using the following procedure.

REPAIR PROCEDURE

1. Verify customer concern.

2. Turn the A/C system ON and disconnect the PSP switch.

• If the A/C system does not function, refer to the Workshop Manual for troubleshooting and repair information.

• If the A/C system operates, replace only the PSP switch terminal assembly.

  NOTE: Replace only the terminal assembly. Do not replace the entire PSP switch.

3. Verify repair.

PARTS INFORMATION

WARRANTY INFORMATION

NOTE: This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.