1995-97 Protege
Some after market security / starter interrupt systems are not compatible with Mazda vehicles. After-market systems with a control unit or relay that is spliced into the B/L wire of the PCM's 1L terminal (ignition switch and TRS (Transmission Range Sensor) may cause MIL illumination and store code P0705 in continuous memory. MIL illumination and code storage will occur when the vehicle is shifted into a "Drive" range and the PCM detects lower then 12V at the 1L terminal. Customers complaining of MIL l amp illumination after the above mentioned installation should have the vehicle inspected as shown below.
NOTE:
If the vehicle has an after-market security / starter interrupt system DO NOT replace the TRS to correct this concern.
Service advisors MUST inform customers that repairs necessitated by after market accessory installation are not covered under Mazda warranty. Interview the customer to determine if the concern occurred after an accessory was installed.
1. Inspect 1L terminal (B/L wire) from the ignition switch to the PCM and TRS for splice required for after-market accessory installation.
If after-market accessory is installed, proceed to step 2.
If no after-market accessory is installed, refer to the workshop manual or wiring diagram for diagnostic / repair information.
2. Measure voltage at terminal 1L (refer to the table below).
Shift Range
Good
Not Good
P or N range
Below 1.0V
1.0V or Higher
Drive, 2nd, and Low
12V and above
Below 12V
3. If terminal 1L voltage is below 12V when the transmission is in a drive range (DRIVE, 2nd and LOW) remove the after-market security system from the 1L circuit and recheck.
If the low voltage condition is still present proceed to step 4.
If the low voltage condition was corrected by the removal of the after market security system, the system should remain disconnected and the harness repaired as necessary.
4. Check the 1L terminal circuit from the PCM to the IGN switch and TRS for a short to ground. Repair as necessary.