MX-5 Miata L4-1.8L DOHC (1996)
Power Steering Pressure Switch: Customer Interest
A/C - Inoperative/MIL ON/DTC P0550
Bulletin No: 07-005/09
Last Issued: 07/06/2009
Subject:
A/C INOPERATIVE/MIL "ON" DTC P0550
BULLETIN NOTE
APPLICABLE MODEL(S)VINS
1997-98 Protege with a "BP" or "Z5" engine and VINS lower than JM1 BC14**W0182001.
1996-97 Miata with VINS lower than JM1 NA35** V0739029.
NOTE:
1997 vehicles produced before 1/13/97 (Miata) and 3/1/97 (Protege) did not have the capacity for Diagnostic Trouble Code (DTC) P0550, however, the
A/C inoperative condition is possible.
DESCRIPTION
Some vehicles may exhibit the (A/C) system inoperative with the Malfunction Indicator lamp (MIL) ON. This may be due the to Power Steering Pressure
(PSP) switch terminal assembly becoming corroded causing the Power-train Control Module (PCM) to open the A/C relay circuit and set 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 repair procedure.
REPAIR PROCEDURE
1. Verify customer concern.
2. Turn the A/C system ON and disconnect the PSP switch connector (A).
- If the A/C system does not function, refer to the workshop manual for troubleshooting information.
- If the A/C system operates, replace only the PSP switch terminal assembly (B).
